Semiconductor devices and fabricating methods thereof

This application is a continuation application of U.S. patent application Ser. No. 14/976,082, filed Dec. 21, 2015, which claims priority to U.S. Provisional Patent Application No. 62/104,478, filed on Jan. 16, 2015, claims priority from Korean Patent Application No. 10-2014-0194004 filed on Dec. 30, 2014, the contents of which are hereby incorporated herein as if set forth in their entireties.

As one scaling technique for increasing the density of integrated circuit devices, a multi-gate transistor has been proposed, in which a fin- or nanowire-shaped silicon body is formed on a substrate and a gate is then formed on a surface of the silicon body.

Since the multi-gate transistor uses a three-dimensional (3D) channel, scaling of the multi-gate transistor is easily achieved. In addition, current controlling capability can be improved even without increasing a gate length of the multi-gate transistor. Further, a short channel effect (SCE), in which an electric potential of a channel region is affected by a drain voltage, can be effectively suppressed.

The present inventive concept provides semiconductor devices, which can minimize a development burden.

The present inventive concept also provides fabricating methods of a semiconductor device, which can minimize a development burden.

These and other objects of the present inventive concept will be described in or be apparent from the following description of some embodiments thereof.

According to some embodiments of the present inventive concept, there is provided a semiconductor device including a first trench having a first depth to define a fin, a second trench formed directly adjacent the first trench having a second depth greater than the first depth, a field insulation layer filling a portion of the first trench and a portion of the second trench, and a protrusion structure protruding from a bottom of the first trench and being lower than a surface of the field insulation layer.

In some embodiments, there is provided a semiconductor device including a first trench having a first depth to define a first active region and a second active region separated from each other, a second trench defining a first fin in the first active region and having a second depth smaller than the first depth, a third trench defining a second fin in the second active region and having a third depth smaller than the first depth, a field insulation layer filling a portion of the first trench, a portion of the second trench and a portion of the third trench, and a first protrusion structure protruding from a bottom of the second trench and being lower than a surface of the field insulation layer.

According to some embodiments of the present inventive concept, there is provided a semiconductor device including a protrusion structure that has a first inclined surface and a second inclined surface, a first trench connected to the first inclined surface and defining a fin, and a second trench connected to the second inclined surface, wherein an inclination angle of a sidewall the second trench is equal to an inclination angle of the second inclined surface, and a height of the protrusion structure is smaller than a height of the fin.

According to some embodiments of the present inventive concept, there are provided fabricating methods of a semiconductor device including forming a plurality of fins by forming a plurality of first trenches having a first depth, defining an active region by forming a second trench having a second depth greater than the first depth, the first trench and the second trench partially overlapping each other so that a protrusion structure is formed at a boundary between the first trench and the second trench, and forming a field insulation layer filling a portion of the first trench and a portion of the second trench.

The above and other features and advantages of the present inventive concept will become more apparent by describing in detail some embodiments thereof with reference to the attached drawings in which:

FIG. 1 is a layout view illustrating a semiconductor device according to a first embodiment of the present inventive concept;

FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 ;

FIG. 3 is a cross-sectional view taken along the line B-B of FIG. 1 ;

FIG. 4 is a cross-sectional view taken along the line C-C of FIG. 1 ;

FIG. 5 is a cross-sectional view illustrating a semiconductor device according to a second embodiment of the present inventive concept;

FIG. 6 is a cross-sectional view illustrating a semiconductor device according to a third embodiment of the present inventive concept;

FIG. 7 is a cross-sectional view illustrating a semiconductor device according to a fourth embodiment of the present inventive concept;

FIG. 8 is a cross-sectional view illustrating a semiconductor device according to a fifth embodiment of the present inventive concept;

FIG. 9 is a cross-sectional view illustrating a semiconductor device according to a sixth embodiment of the present inventive concept;

FIG. 10 is a cross-sectional view taken along the line D-D of FIG. 9 ;

FIG. 11 is a cross-sectional view illustrating a semiconductor device according to a seventh embodiment of the present inventive concept;

FIG. 12 is a cross-sectional view illustrating a semiconductor device according to an eighth embodiment of the present inventive concept;

FIGS. 13 to 16 are diagrams illustrating intermediate process steps of a fabricating method for the semiconductor device according to the first embodiment of the present inventive concept;

FIG. 17 is a block diagram of a memory card including semiconductor devices according to some embodiments of the present inventive concept;

FIG. 18 is a block diagram of an information processing system including semiconductor devices according to some embodiments of the present inventive concept; and

FIG. 19 is a block diagram of an electronic device including semiconductor devices according to some embodiments of the present inventive concept.

Embodiments will be described in detail with reference to the accompanying drawings. The inventive concept, however, may be embodied in various different forms, and should not be construed as being limited only to the illustrated embodiments. Rather, these embodiments are provided as examples so that this disclosure will be thorough and complete, and will fully convey the concept of the inventive concept to those skilled in the art. Accordingly, known processes, elements, and techniques are not described with respect to some of the embodiments of the inventive concept. Unless otherwise noted, like reference numerals denote like elements throughout the attached drawings and written description, and thus descriptions will not be repeated. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity.

It will be understood that, although the terms “first”, “second”, “third”, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the inventive concept.

Spatially relative terms, such as “beneath”, “below”, “lower”, “under”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” or “under” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary terms “below” and “under” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. In addition, it will also be understood that when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the inventive concept. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Also, the term “exemplary” is intended to refer to an example or illustration.

It will be understood that when an element or layer is referred to as being “on”, “connected to”, “coupled to”, or “adjacent to” another element or layer, it can be directly on, connected, coupled, or adjacent to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly connected to”, “directly coupled to”, or “immediately adjacent to” another element or layer, there are no intervening elements or layers present.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this inventive concept belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and/or the present specification and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

FIG. 1 is a layout view illustrating a semiconductor device according to a first embodiment of the present inventive concept, FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 , FIG. 3 is a cross-sectional view taken along the line B-B of FIG. 1 , and FIG. 4 is a cross-sectional view taken along the line C-C of FIG. 1 .

The semiconductor device according to the first embodiment of the present inventive concept will now be described with regard to a case where it is an N-type fin transistor, but aspects of the present inventive concept are not limited thereto.

Referring first to FIGS. 1 to 3 , the semiconductor device according to the first embodiment of the present inventive concept is formed in an active region ACT 1 of a substrate 100 . The substrate 100 may include one or more semiconductor material selected from the group consisting of Si, Ge, SiGe, GaP, GaAs, SiC, SiGeC, InAs and InP. Some embodiments provide that the substrate 100 may be, for example, a silicon on insulator (SOI) substrate.

A fin F 1 may extend in a first direction X. The fin F 1 may be a portion of the substrate 100 and may include an epitaxial layer grown from the substrate 100 .

In FIG. 1 , the fin F 1 having a rectangular shape is illustrated, but aspects of the present inventive concept are not limited thereto. Corners of the fin F 1 may be eroded to be slightly inclined, that is, the fin F 1 may have a chamfered shape. In addition, when the fin F 1 is rectangular, it may include long sides and short sides.

As shown in FIG. 1 , a single fin F 1 may be formed in the active region ACT 1 (that is, a single fin structure). That is to say, the semiconductor device according to the first embodiment of the present inventive concept may be a fin type transistor using a single fin F 1 . Unlike in the illustrated embodiment, two or more fins F 1 may be formed in the active region ACT 1 (that is, a dual fin structure or a multi fin structure).

A metal gate 199 may be formed on the fin F 1 so as to intersect the fin F 1 . That is to say, the metal gate 199 may extend in a second direction Y. The metal gate 199 may include a lower metal layer 132 , an N type work function control layer 170 , a wetting layer 181 , and a gap fill layer 190 . The metal gate 199 may be formed by a replacement process.

The interlayer insulation layer 110 may be formed on the substrate 100 and may include a trench 112 . The interlayer insulation layer 110 may be formed by stacking two or more insulation layers. As shown, sidewalls of the trench 112 may make contact with a spacer 120 and a bottom surface of the trench 112 may make contact with the substrate 100 .

The spacer 120 may include at least one of a nitride layer and an oxynitride layer.

An interface layer 135 may be formed in the trench 112 . As shown, the interface layer 135 may be formed on a bottom surface of the trench 112 by an oxidation process. In addition, unlike in the illustrated embodiment, the interface layer 135 may be conformally formed along the sidewalls and bottom surface of the trench 112 by a deposition process. The deposition process may include, for example, chemical vapor deposition (CVD), and/or atomic layer deposition (ALD), but not limited thereto. The interface layer 135 may be a silicon oxide layer (e.g., HTO), but not limited thereto. The interface layer 135 may be formed to a thickness of, for example, about 50 Å or less (in a range of about 5 Å to about 50 Å). For example, the interface layer 135 may be formed to a thickness of 10 Å. The interface layer 135 may be used to improve operating characteristics (that is, to increase a breakdown voltage) of a high-voltage transistor.

A dielectric layer 130 may be formed on the interface layer 135 conformally along the sidewalls and bottom surface of the trench 112 . The dielectric layer 130 and the interface layer 135 may be disposed to make contact with each other. The dielectric layer 130 may include a high-k material having a higher dielectric constant than silicon oxide. The dielectric layer 130 may include, for example, a material selected from the group consisting of HfO 2 , ZrO 2 , Ta 2 O 5 , TiO 2 , SrTiO 3 and (Ba,Sr)TiO 3 . The dielectric layer 130 may be formed to an appropriate thickness according to the kind of device to be formed. For example, when the dielectric layer 130 includes HfO 2 , it may be formed to a thickness of about 50 Å or less (that is, in a range of about 5 Å to about 50 Å).

The lower metal layer 132 may be formed on the dielectric layer 130 conformally along the sidewalls and bottom surface of the trench 112 . The lower metal layer 132 may include, for example, at least one of TiN and TaN. For example, the lower metal layer 132 may be a stacked layer of TiN and TaN. In this case, a TiN layer is formed to make contact with the dielectric layer 130 and a TaN layer may be formed on the TiN layer so as to make contact with the TiN layer. The TiN layer may protect the dielectric layer 130 and the TaN layer may be used as an etch stop layer when a portion of the N type work function control layer 170 is removed.

The N type work function control layer 170 may be formed on the lower metal layer 132 in the trench 112 . As shown, the N type work function control layer 170 may also conformally formed along the sidewalls and bottom surface of the trench 112 . The N type work function control layer 170 may control a work function of an N type transistor, thereby adjusting operating characteristics of the N type transistor. The N type work function control layer 170 may include a material selected from the group consisting of TiAl, TiAlC, TiAlN, TaC, TiC, and HfSi. For example, the N type work function control layer 170 may be a TiAlC.

The wetting layer 181 may be formed on the N type work function control layer 170 in the trench 112 . The wetting layer 181 may include at least one of TiN and Ti. In some embodiments, the wetting layer 181 may include a TiN layer and a T 1 layer sequentially stacked. For example, when the gap fill layer 190 includes aluminum (Al), the wetting layer 181 may be formed of a single layer of T 1 or TiN. When the gap fill layer 190 includes tungsten (W), the wetting layer 181 may be formed of a single layer of TiN. The wetting layer 181 may be formed to a thickness in a range between about 10 Å and 100 Å (for example, 70 Å).

Meanwhile, referring to FIGS. 1 and 4 , as described above, the fin F 1 may be defined by a first trench T 1 having a first depth D 1 , the active region ACT 1 may be defined by a second depth (D 1 +D 2 ) that is greater than the first depth D 1 . The first trench T 1 may be a shallow trench and the second trench T 2 may be a deep trench.

In some embodiments, the first trench T 1 and the second trench T 2 may be disposed to be directly adjacent one another. The phrase “directly adjacent” used herein may mean that another trench having a first depth (i.e., a shallow trench) does not intervene between the first trench T 1 and the second trench T 2 .

A field insulation layer 105 is formed to fill a portion of the first trench T 1 and a portion of the second trench T 2 .

Protrusion structures PRT 1 and PRT 2 may protrude from a bottom of the first trench T 1 and may be formed to be lower than a surface of the field insulation layer 105 . As shown, the protrusion structures PRT 1 and PRT 2 may be positioned at a boundary between the first trench T 1 and the second trench T 2 .

For example, after forming a plurality of fins by forming the first trench T 1 having the first depth D 1 (see FIGS. 13 and 14 ), the second trench T 2 having the second depth (D 1 +D 2 ) greater than the first depth D 1 is formed, thereby defining the active region ACT 1 (see FIGS. 15 and 16 ). Here, when the second trench T 2 is formed, among the plurality of fins (e.g., 3 fins), only a target number of fins (e.g., one fin) are left. That is to say, when the second trench T 2 is formed, among the plurality of fins (e.g., 3 fins), a number of fins (e.g., 2 fins) are removed. If a mask for forming the first trench T 1 and a mask for forming the second trench T 2 are misaligned, the number of fins (e.g., 2 fins) may not be completely removed when the second trench T 2 is formed, but traces may remain. The traces may become the protrusion structures PRT 1 and PRT 2 .

Here, if the protrusion structures PRT 1 and PRT 2 have considerably large sizes, the large sizes may cause failures in a subsequent process. However, in order to completely remove the protrusion structures PRT 1 and PRT 2 , processing conditions may be quite strictly managed. In this case, however, a development burden may be unavoidably incurred. Therefore, the protrusion structures PRT 1 and PRT 2 may be managed so as to have appropriate sizes, thereby minimizing the development burden while increasing the yield. For example, the protrusion structures PRT 1 and PRT 2 may be managed such that their height H 1 is smaller than a height H 10 of the fin F 1 and the protrusion structures PRT 1 and PRT 2 are lower than a surface of the field insulation layer 105 . If tips of the protrusion structures PRT 1 and PRT 2 protrude higher than the surface of the field insulation layer 105 , a processing failure (e.g., a short) may occur in a subsequent replacement process).

The protrusion structures PRT 1 and PRT 2 include a first inclined surface S 1 disposed at a side of the first trench T 1 and a second inclined surface S 2 disposed at a side of the second trench T 2 . The first inclined surface S 1 may have a first inclination angle and the second inclined surface S 2 may have a second inclination angle that is different from the first inclination angle. As shown, the second inclined surface S 2 having the second inclination angle may be steeper than the first inclined surface S 1 having the first inclination angle. The first inclined surface S 1 is connected to the first trench T 1 and the second inclined surface S 2 is connected to the second trench T 2 . The inclination angle of the second inclined surface S 2 is equal to an inclination angle of a sidewall S 3 of the second trench T 2 . That is to say, the second inclined surface S 2 and the sidewall S 3 of the second trench T 2 may be disposed on the same line.

Meanwhile, the protrusion structures PRT 1 and PRT 2 may be disposed at opposite sides of the active region ACT 1 in view of the fin F 1 . In addition, as shown, the first protrusion structure PRT 1 and the second protrusion structure PRT 2 may be symmetrically disposed with respect to each other in view of the fin F 1 .

In addition, the protrusion structures PRT 1 and PRT 2 may extend lengthwise in a direction (X) in which the fin F 1 extends. In addition, as shown in FIGS. 1 and 3 , the metal gate 199 may be formed to intersect the fin F 1 and the protrusion structures PRT 1 and PRT 2 .

FIG. 5 is a cross-sectional view illustrating a semiconductor device according to a second embodiment of the present inventive concept. For the sake of brevity and convenient explanation, the following description will focus on differences between the present embodiment and the previous embodiment shown in FIGS. 1 to 4 .

Referring to FIG. 5 , in the semiconductor device according to the second embodiment of the present inventive concept, a protrusion structure PRT 1 may be disposed at only one side of the active region ACT 1 in view of a fin F 1 .

Likewise, the protrusion structure PRT 1 may have a height H 1 and the height may be lower than a surface of a field insulation layer 105 . The protrusion structure PRT 1 includes a first inclined surface S 1 disposed at a side of a first trench T 1 and a second inclined surface S 2 disposed at a side of a second trench T 2 . The first inclined surface S 1 may have a first inclination angle and the second inclined surface S 2 may have a second inclination angle different from the first inclination angle. As shown, the second inclined surface S 2 having the second inclination angle may be steeper than the first inclined surface S 1 having the first inclination angle. The first inclined surface S 1 is connected to the first trench T 1 and the second inclined surface S 2 is connected to the second trench T 2 .

FIG. 6 is a cross-sectional view illustrating a semiconductor device according to a third embodiment of the present inventive concept. For the sake of brevity and convenient explanation, the following description will focus on differences between the present embodiment and the previous embodiment shown in FIGS. 1 to 4 .

Referring to FIG. 6 , in the semiconductor device according to the third embodiment of the present inventive concept, protrusion structures PRT 1 and PRT 2 may be asymmetrically disposed with respect to each other in view of the fin F 1 .

The first protrusion structure PRT 1 and the second protrusion structure PRT 2 may have different sizes. That is to say, the height H 1 of the protrusion structure PRT 1 and the height H 2 of the second protrusion structure PRT 2 may be different from each other. As shown, the first protrusion structure PRT 1 may be larger than the second protrusion structure PRT 2 in size, and the height H 1 of the first protrusion structure PRT 1 may be greater than the height H 2 of the second protrusion structure PRT 2 .

FIGS. 7 and 8 are cross-sectional views illustrating semiconductor devices according to fourth and fifth embodiments of the present inventive concept. For the sake of brevity and convenient explanation, the following description will focus on differences between the present embodiment and the previous embodiment shown in FIGS. 1 to 4 .

As shown in FIG. 7 , the semiconductor device according to the fourth embodiment of the present inventive concept may be a fin type transistor using two fins F 1 and F 2 (i.e., a dual fin structure). That is to say, the two fins F 1 and F 2 may be formed in a first active region ACT 1 .

Here, a third trench T 3 having a third depth may be disposed between the fin F 1 and the fin F 2 . The third trench T 3 may be formed at the same with the first trench T 1 . In addition, the third depth of the third trench T 3 and the first depth of the first trench T 1 may be equal to each other.

As shown in FIG. 8 , the semiconductor device according to the fifth embodiment of the present inventive concept may be a fin type transistor using three or more fins F 1 to F 7 (i.e., a multi fin structure). That is to say, three or more fins F 1 to F 7 may be formed in a first active region ACT 1 .

As shown, a first protrusion structure PRT 1 may be formed between a first trench T 1 disposed at a side of a fin F 7 (i.e., a fin disposed at one end) and a second trench T 2 and a second protrusion structure PRT 2 may be formed between the first trench T 1 disposed at a side of a fin F 1 (i.e., a fin disposed at the other end) and the second trench T 2 .

Here, third trench T 3 each having a third depth may be disposed between each adjacent ones of the fins F 1 ˜F 7 . The third trenches T 3 may be formed at the same time with the first trench T 1 . In addition, the third depth of the third trench T 3 and the first depth of the first trench T 1 may be equal to each other.

FIG. 9 is a cross-sectional view illustrating a semiconductor device according to a sixth embodiment of the present inventive concept and FIG. 10 is a cross-sectional view taken along the line D-D of FIG. 9 . For the sake of brevity and convenient explanation, the following description will focus on differences between the present embodiment and the previous embodiment shown in FIGS. 1 to 4 .

Referring to FIGS. 9 and 10 , the semiconductor device according to the sixth embodiment of the present inventive concept includes a first active region ACT 1 and a second active region ACT 2 separated from each other. A fin F 1 is formed in the first active region ACT 1 and a fin F 8 is formed in the second active region ACT 2 .

The fins F 1 and F 8 may extend lengthwise in a first direction X. The fins F 1 and F 8 may be portions of a substrate 100 and may include epitaxial layers grown from the substrate 100 .

Here, the fin F 1 may be defined by a first trench T 1 having a first depth D 1 and the fin F 8 may be defined by a fourth trench T 4 having a third depth D 3 . The first trench T 1 and the fourth trench T 4 may be formed at the same time. In addition, the first depth D 1 and the third depth D 3 may be equal to each other.

Meanwhile, the first and second active regions ACT 1 and ACT 2 may be defined by a second trench T 2 having a second depth (D 1 +D 2 ) greater than the first depth D 1 or the third depth D 3 .

As shown, one fin F 1 , F 8 formed in the first, second active region ACT 1 , ACT 2 is illustrated, but aspects of the present inventive concept are not limited thereto. That is to say, two or more fins may be formed in each of the active regions ACT 1 and ACT 2 .

A metal gate 199 may be formed on the fin F 1 so as to intersect the fin F 1 . The metal gate 199 may extend in a second direction Y. In addition, a metal gate 299 may be formed on the fin F 2 so as to intersect the fin F 2 . The metal gate 299 may extend in the second direction Y.

The two metal gates 199 and 299 may be different gates or may be connected to each other.

A first protrusion structure PRT 1 may protrude from a bottom surface of a first trench T 1 and may be lower than the surface of the field insulation layer 105 . The first protrusion structure PRT 1 may be positioned at a boundary between the first trench T 1 and the second trench T 2 .

The first protrusion structure PRT 1 may include a first inclined surface S 1 disposed at a side of the first trench T 1 and a second inclined surface S 2 disposed at a side of the second trench T 2 . The inclined surface S 1 may have a first inclination angle and the inclined surface S 2 may have a second inclination angle that is different from the first inclination angle. As shown, the inclined surface S 1 has the first inclination angle and the inclined surface S 2 has the second inclination angle.

In addition, a third protrusion structure PRT 3 may protrude from a bottom surface of a fourth trench T 4 and may be lower than the surface of the field insulation layer 105 . The third protrusion structure PRT 3 may be positioned at a boundary between the fourth trench T 4 and the second trench T 2 .

The third protrusion structure PRT 3 may include an inclined surface S 11 disposed at a side of the fourth trench T 4 and an inclined surface S 12 disposed at a side of the second trench T 2 . The inclined surface S 11 may have an eleventh inclination angle and the inclined surface S 12 may have a twelfth inclination angle that is different from the eleventh inclination angle. As shown, the inclined surface S 11 has an eleventh inclination angle and the inclined surface S 12 having the twelfth inclination angle may be steeper than the inclined surface S 11 having the eleventh inclination angle. Some embodiments provide that the first inclination angle and the second inclination angle may be steeper than the inclined surface S 11 having the eleventh inclination angle.

As shown, the first protrusion structure PRT 1 and the third protrusion structure PRT 3 may be symmetrically disposed with respect to each other in view of the second trench T 2 . In addition, a height H 1 of the protrusion structure PRT 1 may be different from a height H 3 of the third protrusion structure PRT 3 may be equal to each other.

In addition, the fin F 1 may extend lengthwise in a first direction X. The fin F 1 may be shaped of a rectangle having long sides and short sides. Likewise, the fin F 8 may extend lengthwise in the first direction X. The fin F 8 may be shaped of a rectangle having long sides and short sides. The long sides of the fin F 1 and the fin F 8 may be disposed to face each other. The protrusion structures PRT 1 and PRT 3 may be lengthwise formed along the long sides of the fin F 1 and the fin F 8 .

FIG. 11 is a cross-sectional view illustrating a semiconductor device according to a seventh embodiment of the present inventive concept. For the sake of brevity and convenient explanation, the following description will focus on differences between the present embodiment and the previous embodiment shown in FIGS. 9 and 10 .

Referring to FIG. 11 , in the semiconductor device according to the seventh embodiment of the present inventive concept, a protrusion structure PRT 1 may be disposed at only one side of a second trench T 2 . That is to say, the protrusion structure PRT 1 may be positioned only at a boundary between a first trench T 1 and the second trench T 2 but may not be positioned at a boundary between the second trench T 2 and a fourth trench T 4 .

FIG. 12 is a cross-sectional view illustrating a semiconductor device according to an eighth embodiment of the present inventive concept. For the sake of brevity and convenient explanation, the following description will focus on differences between the present embodiment and the previous embodiment shown in FIGS. 9 and 10 .

Referring to FIG. 12 , in the semiconductor device according to the eighth embodiment of the present inventive concept, the protrusion structures PRT 1 and PRT 3 may be disposed at opposite sides of a second trench T 2 . However, the protrusion structures PRT 1 and PRT 3 may be asymmetrically disposed with respect to each other in view of the second trench T 2 . In other words, the protrusion structures PRT 1 and PRT 3 may have different sizes. For example, a height H 1 of the protrusion structure PRT 1 and a height H 4 of the protrusion structure PRT 3 may be different from each other.

Hereinafter, a fabricating method for the semiconductor device according to the first embodiment of the present inventive concept will be described with reference to FIGS. 13 to 16 with FIGS. 1 to 4 .

FIGS. 13 and 15 are diagrams illustrating intermediate process steps of a fabricating method for the semiconductor device according to the first embodiment of the present inventive concept, and FIGS. 14 and 16 are cross-sectional views taken along the line C-C of FIGS. 13 and 15 .

First, referring to FIGS. 13 and 14 , a plurality of fins F 1 , F 11 and F 12 are formed on a substrate 100 . The fins F 1 , F 11 and F 12 may extend lengthwise in a first direction X. A mask pattern is formed on the substrate 100 and a portion of the substrate 100 is etched using the mask pattern. That is to say, the plurality of fins F 1 , F 11 and F 12 are formed by forming a first trench T 1 having a first depth D 1 on the substrate 100 . The fins F 1 , F 11 and F 12 may be disposed such that long sides thereof face each other.

Next, referring to FIGS. 15 and 16 , a second trench T 2 having a second depth (D 1 +D 2 ) greater than the first depth D 1 is formed to define an active region ACT 1 . Some fins F 11 and F 12 among the plurality of fins F 1 , F 11 and F 12 are removed by forming the second trench T 2 . That is to say, portions of the first trench T 1 and the second trench T 2 may overlap each other. In such a manner, protrusion structures PRT 1 and PRT 2 may be formed at a boundary between the first trench T 1 and the second trench T 2 .

The protrusion structures PRT 1 and PRT 2 may have various shapes according to the extent of alignment between the first trench T 1 and the second trench T 2 . That is to say, the protrusion structures PRT 1 and PRT 2 may be symmetrically disposed with respect to each other (see FIGS. 4 and 16 ). In some embodiments, the protrusion structure PRT 1 may be formed only at one side of the active region ACT 1 (see FIG. 5 ), or the protrusion structures PRT 1 and PRT 2 may be formed at opposite sides of the active region ACT 1 to be symmetrical with respect to each other in view of the fin F 1 (see FIG. 6 ).

Referring again to FIGS. 1 to 4 , the metal gate 199 is formed to intersect the fin F 1 . In detail, a poly gate is formed to intersect the fin F 1 and the interlayer insulation layer 110 is then formed to sufficiently cover the fin F 1 and the poly gate. A polarization process is performed to expose a top surface of the poly gate. Next, the exposed poly gate is removed to form the trench 112 . The dielectric layer 130 and the metal gate 199 are formed in the trench 112 .

Those skilled in the art can fully analogize fabricating methods of the semiconductor devices according to the second to eighth embodiments based on the aforementioned fabricating method of the semiconductor devices according to the first embodiment of the present inventive concept.

FIG. 17 is a block diagram illustrating an example memory card including semiconductor devices according to some embodiments of the present inventive concept.

Referring to FIG. 17 , a memory 1210 including semiconductor devices according to various embodiments of the present inventive concept can be employed to the memory card 1200 . The memory card 1200 according to the present inventive concept includes a memory controller 1220 controlling data exchange between a host and the memory 1210 .

A static random access memory (SRAM) 1221 is used as a working memory of a processing unit 1222 . A host interface 1223 includes a data exchange protocol of the host 1230 connected to the memory card 1200 . An error correction block 1224 detects and corrects an error included in data read from the memory 1210 . A memory interface 1225 interfaces with the memory 1210 according to the present inventive concept. A central processing unit 1222 performs an overall controlling operation for data exchange of the memory controller 1220 .

FIG. 18 is a block diagram illustrating an example information processing system having a semiconductor device according to some embodiments of the present inventive concept mounted therein.

Referring to FIG. 18 , an information processing system 1300 may include a memory system 1310 including semiconductor devices according to various embodiments of the present inventive concept. The information processing system 1300 according to the present inventive concept includes a memory system 1310 , a modem 1320 , a central processing unit (CPU) 1330 , a random access memory (RAM) 1340 , and a user interface 1350 , which are electrically connected to a system bus 1360 , respectively. The memory system 1310 may include a memory 1311 and a memory controller 1312 and may have substantially the same configuration as the memory card 1200 shown in FIG. 12 . The memory system 1310 may store data processed by the CPU 1330 and/or data received from an external device.

The information processing unit 1300 may be applied to a memory card, a solid state disk (SSD), a camera image processor (CIS) and other various an application chipsets. For example, the information processing unit 1300 may be configured to employ a solid state disk (SSD) and, in this case, it can stably process large-capacity data in a stable, reliable manner.

FIG. 19 is a block diagram of an electronic device including semiconductor devices according to some embodiments of the present inventive concept.

Referring to FIG. 19 , the electronic device 1400 may include semiconductor devices according to some embodiments of the present inventive concept. The electronic device 1400 may be applied to a wireless communication device (for example, a personal digital assistant (PDA), a notebook computer, a portable computer, a web tablet, a wireless phone, and/or a wireless digital music player) or any type of electronic device capable of transmitting and/or receiving information in a wireless environment.

The electronic device 1400 may include a controller 1410 , an input/output device (I/O) 1420 , a memory 1430 , and a wireless interface 1440 . Here, the memory 1430 may include semiconductor devices according to various embodiments of the present inventive concept. The controller 1410 may include a microprocessor, a digital signal processor, and a processor capable of performing functions similar to these components. The memory 1430 may be used to store commands processed by the controller 1410 (or user data). The wireless interface 1440 may be used to exchange data through a wireless data network. The wireless interface 1440 may include an antenna and/or a wired/wireless transceiver. For example, the electronic device 1400 may use a third generation communication system protocol, such as CDMA, GSM, NADC, E-TDMA, WCDMA, CDMA2000, or the like.

While the present inventive concept has been particularly shown and described with reference to example embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present inventive concept as defined by the following claims. It is therefore desired that the present embodiments be considered in all respects as illustrative and not restrictive, reference being made to the appended claims rather than the foregoing description to indicate the scope of the inventive concept.