Patent Document

BACKGROUND  
       [0001]     The present disclosures relate to semiconductor devices, and more particularly, to a method of making a multiple crystal orientation semiconductor device.  
         [0002]     Substrates with Dual Orientation (DSO) are desirable because they allow taking advantage of enhanced electron and hole mobility in the (100) and (110) crystal orientations, respectively. In one method of making a dual orientation substrate, the method requires etching through the buried oxide (BOX) to access the bottom substrate. The bottom substrate provides the alternate Si plane to the SOI layer. However, dry etching through the BOX and stopping on bottom Si substrate can induce damage on the Si surface of the bottom substrate. This damage can negatively impact the selective Si epitaxy process, thus resulting in dislocations in the active area of the selective Si epi. Thus, the damage is detrimental to subsequently formed devices since the damage induces defects into the channel epi.  
         [0003]     Accordingly, there is a need for an improved method for overcoming the problems in the art as discussed above. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0004]     The present invention is illustrated by way of example and not limited by the accompanying figures, in which like references indicate similar elements, and in which:  
         [0005]      FIGS. 1-8  illustrate device cross-sections at various process steps in the method of making a semiconductor device structure having multiple crystal orientations according to an embodiment of the present disclosure; and  
         [0006]      FIGS. 9-17  illustrate device cross-sections at various process steps in the method of making a semiconductor device structure having multiple crystal orientations according to another embodiment of the present disclosure. 
     
    
       [0007]     The use of the same reference symbols in different drawings indicates similar or identical items. Skilled artisans will also appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve the understanding of the embodiments of the present invention.  
       DETAILED DESCRIPTION  
       [0008]      FIGS. 1-8  illustrate device cross-sections at various process steps in the method of making a semiconductor device structure having multiple crystal orientations according to one embodiment of the present disclosure. Turning now to  FIG. 1 , a portion of a semiconductor device  10  includes a semiconductor-on-insulator (SOI) substrate  12  having an etch stop layer  14  disposed between a buried oxide (BOX) layer  16  and substrate  12  of the SOI structure. In one embodiment, the etch stop layer  14  comprises an etch stop layer added to the SOI structure as part of a layer transfer or wafer bonding process during the manufacture of the SOI wafer. SOI structure comprises any suitable semiconductor-on-insulator structure according to the particular requirements of a given semiconductor device application. For example, the SOI structure could include a silicon-on-insulator structure, a germanium-on-insulator structure, or other suitable strained or non-strained semiconductor on insulator structure.  
         [0009]     Etch stop layer  14  comprises a layer selected in conjunction with an available highly selective etch chemistry or chemistries, with respect to the BOX layer  16  and with respect to the underlying SOI substrate  12 . In particular, layer  14  acts as an etch stop for a subsequent oxide etch with respect to BOX layer  16 . The etch stop layer  14  comprises, for example, a nitride, hafnium oxide, or any other suitable dielectric or insulator. Furthermore, in another embodiment, the etch stop layer  14  can comprise any suitable dielectric layer stack. One example of a dielectric layer stack includes an oxide and a nitride, wherein the oxide is overlying the underlying SOI substrate and the nitride is on top of the oxide. Furthermore, the etch stop layer  14  can comprise a dielectric layer stack of a high-K dielectric layer with an oxide interface layer, wherein high-K represents any dielectric value greater than a predetermined threshold dielectric value.  
         [0010]     In addition, an SOI layer  18  is disposed overlying the BOX  16 . In one embodiment, the substrate  12  includes a first crystal orientation and the SOI layer  18  includes a second crystal orientation. Substrate  12  can comprise any suitable semiconductor substrate for a given semiconductor device application. In one embodiment, substrate  12  comprises silicon. In addition, SOI layer  18  comprises any suitable semiconductor layer for a given semiconductor device application. In one embodiment, SOI layer  18  comprises silicon.  
         [0011]     As illustrated, substrate  12  comprises a semiconductor substrate having a (110) crystal orientation and SOI layer  18  comprises a semiconductor layer having a (100) crystal orientation. Other combinations of crystal orientations are possible, for example, substrate  12  can comprise a semiconductor substrate having a (100) crystal orientation and SOI layer  18  can comprise a semiconductor layer having a (110) crystal orientation.  
         [0012]     Further with reference to  FIG. 1 , a suitable pad oxide  19  and a first anti-reflective coating (ARC)/polish stop layer  21  are disposed overlying the SOI layer  18 , as discussed further herein. Pad oxide  19  provides a buffer between the ARC/polish stop layer  21  and the SOI layer  18 . In one embodiment, pad oxide  19  comprises a thermal oxide and the ARC/polish stop layer  21  comprises a nitride.  
         [0013]     Turning now to  FIG. 2 , an opening  20  is formed in a desired region of (i) trench isolation and (ii) first crystal orientation epitaxial growth, wherein the opening  20  extends through a series of layers, down to the buried etch stop layer  14 . Formation of opening  20  can be accomplished using any suitable patterning and etch techniques, wherein the etch chemistry/chemistries are suitable to etch through the ARC/polish stop layer  21 , the pad oxide layer  19 , the SOI layer  18 , and the BOX  16 . In one embodiment, the etch chemistry (chemistries) used to form opening  20  is (are) selected to provide an aggressive etch that is highly selective to the etch stop layer  14 . For example, formation of opening  20  can be accomplished using a dry etch. In addition, the opening  20  has sidewalls with a fairly vertical profile and a bottom surface defined by an exposed portion of the etch stop layer  14 .  
         [0014]     Turning now to  FIG. 3 , opening  20  is filled with an oxide  22 , preferably, a deposited oxide. In one embodiment, the deposited oxide  22  comprises a high density plasma enhanced chemical vapor deposition (HDPECVD) oxide. In another embodiment, the deposited oxide  22  comprises a plasma enhanced chemical vapor deposition (PECVD) oxide. In yet another embodiment, the deposited oxide  22  comprises a chemical vapor deposition (CVD) oxide.  
         [0015]     Subsequent to the filling of opening  20  with the deposited oxide  22 , the entire structure is planarized down to the ARC/polish stop layer  21 , using any suitable planarization technique. For example, the structure  10  could be planarized using chemical mechanical polishing. A second anti-reflective coating (ARC) layer  23  is then deposited onto the planarized surfaces of the ARC/polish stop layer  21  and the deposited oxide  22 .  
         [0016]     Turning now to  FIG. 4 , an opening  24  is formed within a desired region of the first crystal orientation epitaxial growth, wherein the opening extends through the ARC  23  and the deposited oxide  22 , down to the buried etch stop layer  14 . Formation of the opening  24  can be accomplished using any suitable patterning and etch techniques, wherein the etch chemistry/chemistries are suitable to etch through the ARC layer  23  and the deposited oxide  22 . The etch chemistry (chemistries) used to form opening  24  is (are) selected to provide an aggressive etch that is highly selective to the etch stop layer  14 . In one embodiment, formation of opening  24  is accomplished using a dry etch. In addition, the opening  24  has sidewalls with a fairly vertical profile and a bottom surface defined by an exposed portion of the etch stop layer  14 .  
         [0017]     Subsequent to the formation of opening  24 , a portion of the etch stop layer  14  exposed by the opening  24  as shown in  FIG. 4  is then removed as illustrated in  FIG. 5 , thus forming opening  26 . Removal of the exposed portion of etch stop layer  14  comprises the use of any suitable gentle etch that is highly selective to the deposited oxide  22  and highly selective to the underlying SOI substrate  12 . The etch chemistry (chemistries) are selected so that the portion of surface of the SOI substrate  12  exposed by removal of the exposed portion of the etch stop layer  14  is a substantially defect-free surface. In other words, removal of the exposed portion of the etch stop layer  14  is carried out using an etch that minimizes or eliminates the risk of damaging the surface of the SOI substrate  12 . In one embodiment, removal of the exposed portion of the etch stop layer  14  is accomplished using a wet etch.  
         [0018]     Accordingly,  FIG. 5  illustrates an opening  26  that is formed subsequent to removal of the exposed portion of etch stop layer  14 . As understood, the introduction of the etch stop layer  14 , in the region of the trench isolation formation and first crystal orientation epitaxial growth, eliminates the risk of damaging the exposed semiconductor surface. In contrast, prior techniques resulted in damaging the exposed semiconductor surface that occurs through use of a dry etch for forming an opening through the BOX layer without the presence of an intermediate etch stop layer between the BOX and the underlying substrate.  
         [0019]     Referring now to  FIG. 6 , an epitaxial material  28  is grown on the exposed surface of the semiconductor substrate  12  within opening  26  ( FIG. 5 ). Epitaxial material  28  is grown to a desired amount. For example, epitaxial material  28  can be grown to overflow the opening  26 , wherein a portion of the epitaxial material overflows the opening  26  in the shape of a mushroom. As a result of the defect free surface at an interface  30  between the underlying substrate  12  and the epitaxial material  28 , the epitaxial material  28  will be of high quality and have minimal defects. The interface  30  is illustrated as a dashed line in  FIG. 6  and in reality may not be readily discernable in the actual device structure. The epitaxial material  28  will also comprise a same crystal orientation as that of the SOI substrate  12 . In one embodiment, the SOI substrate  12  comprises a silicon substrate having a (110) crystal orientation and the epitaxial material  28  comprises silicon having a (110) crystal orientation.  
         [0020]     Subsequent to the epitaxial growth of material  28 , the structure is planarized as shown in  FIG. 7 . The entire structure is planarized, to remove a portion of epi  28  and to remove ARC layer  23 , ARC/polish stop layer  21 , and pad oxide layer  19 , down to the SOI layer  18 , using any suitable planarization technique. For example, the structure  10  could be planarized using chemical mechanical polishing. The planarized surface is indicated by reference numeral  32  in  FIG. 7 .  
         [0021]     Referring now to  FIG. 8 , semiconductor devices  34  and  36  are formed using any suitable semiconductor processing techniques. Semiconductor devices  34  and  36  are formed in first and second regions, wherein the first region corresponds to a region of the planarized epitaxial material  28  having the first crystal orientation and the second region corresponds to the SOI layer  18  having the second crystal orientation. Device  34  includes, for example, a gate dielectric  37 , gate electrode  38 , sidewall spacers  39 , and source/drain regions  40  and  41 . Similarly, device  36  includes, for example, a gate dielectric  42 , gate electrode  43 , sidewall spacers  44 , and source/drain regions  45  and  46 .  
         [0022]     Semiconductor devices  34  and  36  can comprise any suitable semiconductor devices according to the requirements of a given semiconductor device application and a corresponding manufacturing process. In one embodiment, semiconductor device  34  comprises a P-type device and semiconductor device  36  comprises an N-type device. In addition, the remainder portions of deposited oxide  22  form suitable isolation regions, for example, between device  34 , device  36  and possibly other devices (not shown).  
         [0023]      FIGS. 9-17  illustrate device cross-sections at various process steps in the method of making a semiconductor device structure having multiple crystal orientations according to another embodiment of the present disclosure. Turning now to  FIG. 9 , a portion of a semiconductor device  50  includes a semiconductor-on-insulator (SOI) substrate  52  having an etch stop layer  54  disposed between a buried oxide (BOX) layer  56  and substrate  52  of the SOI structure. In one embodiment, the etch stop layer  54  comprises an etch stop layer added to the SOI structure as part of a layer transfer or wafer bonding process during the manufacture of the SOI wafer. SOI structure comprises any suitable semiconductor-on-insulator structure according to the particular requirements of a given semiconductor device application. For example, the SOI structure could include a silicon on insulator structure, a germanium on insulator structure, or other suitable strained or non-strained semiconductor on insulator structure.  
         [0024]     Etch stop layer  54  comprises a layer selected in conjunction with an available highly selective etch chemistry or chemistries, with respect to the BOX layer  56  and with respect to the underlying SOI substrate  52 . In particular, layer  54  acts as an etch stop for a subsequent oxide etch with respect to BOX layer  56 . The etch stop layer  54  comprises, for example, a nitride, hafnium oxide, or any other suitable dielectric or insulator. Furthermore, in another embodiment, the etch stop layer  54  comprises any suitable dielectric layer stack. One example of a dielectric layer stack includes an oxide and a nitride, wherein the oxide is overlying the underlying SOI substrate and the nitride is on top of the oxide. Furthermore, the etch stop layer  54  can comprise a dielectric layer stack of a high-K dielectric layer with an oxide interface layer.  
         [0025]     In addition, an SOI layer  58  is disposed overlying the BOX  56 . In one embodiment, the substrate  52  includes a first crystal orientation and the SOI layer  58  includes a second crystal orientation. Substrate  52  can comprise any suitable semiconductor substrate for a given semiconductor device application. In one embodiment, substrate  52  comprises silicon. In addition, SOI layer  58  comprises any suitable semiconductor layer for a given semiconductor device application. In one embodiment, SOI layer  58  comprises silicon.  
         [0026]     As illustrated, substrate  52  comprises a semiconductor substrate having a (110) crystal orientation and SOI layer  58  comprises a semiconductor layer having a (100) crystal orientation. Other combinations of crystal orientations are possible, for example, substrate  52  can comprise a semiconductor substrate having a (100) crystal orientation and SOI layer  58  can comprise a semiconductor layer having a (110) crystal orientation.  
         [0027]     Further with reference to  FIG. 9 , a suitable pad oxide  59  and a first anti-reflective coating (ARC)/polish stop layer  61  are disposed overlying the SOI layer  58 , as discussed further herein. Pad oxide  59  provides a buffer between the ARC/polish stop layer  61  and the SOI layer  58 . In one embodiment, pad oxide  59  comprises a thermal oxide and the ARC/polish stop layer  61  comprises a nitride.  
         [0028]     Turning now to  FIG. 10 , an opening  60  is formed in a desired region of (i) trench isolation and (ii) first crystal orientation epitaxial growth, wherein the opening  60  extends through a series of layers, down to the buried etch stop layer  54 . Formation of opening  60  can be accomplished using any suitable patterning and etch techniques, wherein the etch chemistry/chemistries are suitable to etch through the ARC/polish stop layer  61 , the pad oxide layer  59 , the SOI layer  58 , and the BOX  56 . In one embodiment, the etch chemistry (chemistries) used to form opening  60  is (are) selected to provide an aggressive etch that is highly selective to the etch stop layer  54 . For example, formation of opening  60  can be accomplished using a dry etch. In addition, the opening  60  has sidewalls with a fairly vertical profile and a bottom surface defined by an exposed portion of the etch stop layer  54 .  
         [0029]     Turning now to  FIG. 11 , the method includes forming sidewall spacers  62 . Sidewall spacers  62  can be formed by depositing a dielectric and etching the dielectic back to form the sidewall spacers, for example, using a suitable sidewall spacer formation technique. The dielectric includes, for example, an oxide, a nitride, or any other suitable dielectric. In one embodiment, the dielectric of sidewall spacer  62  comprises a high density plasma enhanced chemical vapor deposition (HDPECVD) oxide. In another embodiment, the dielectric of sidewall spacer  62  comprises a plasma enhanced chemical vapor deposition (PECVD) oxide. In yet another embodiment, the dielectric of sidewall spacer  62  comprises a chemical vapor deposition (CVD) oxide. Subsequent to formation of sidewall spacers  62 , a portion of the etch stop layer  54  remains exposed within opening  60 .  
         [0030]     Subsequent to the formation of sidewall spacers  62 , a portion of the etch stop layer  54  exposed by the opening  60  as shown in  FIG. 11  is then removed as illustrated in  FIG. 12 , thus forming opening  64 . Removal of the exposes portion of etch stop layer  54  comprises the use of any suitable gentle etch that is highly selective to the sidewall spacers  62  and highly selective to the underlying SOI substrate  52 . The etch chemistry (chemistries) are selected so that the portion of surface of the SOI substrate  52  exposed by removal of the exposed portion of the etch stop layer  54  is a substantially defect-free surface. In other words, removal of the exposed portion of the etch stop layer  54  is carried out using an etch that minimizes or eliminates the risk of damaging the surface of the SOI substrate  52 . In one embodiment, removal of the exposed portion of the etch stop layer  54  is accomplished using a wet etch.  
         [0031]     Accordingly,  FIG. 12  illustrates an opening  64  that is formed subsequent to removal of the exposed portion of etch stop layer  54 . As understood, the introduction of the etch stop layer  54 , in the region of the trench isolation formation and first crystal orientation epitaxial growth, eliminates the risk of damaging the exposed semiconductor surface. In contrast, prior techniques resulted in damaging the exposed semiconductor surface which occurs through use of a dry etch for forming an opening through the BOX layer without the presence of an intermediate etch stop layer between the BOX and the underlying substrate.  
         [0032]     Referring now to  FIG. 13 , an epitaxial material  66  is grown on the exposed surface of the semiconductor substrate  52  within opening  64  ( FIG. 12 ). Epitaxial material  66  is grown to a desired amount. For example, epitaxial material  66  can be grown to overflow the opening  64 , wherein a portion of the epitaxial material overflows the opening  64  in the shape of a mushroom. As a result of the defect free surface at an interface  68  between the underlying substrate  52  and the epitaxial material  66 , the epitaxial material  66  will be of high quality and have minimal defects. The interface  68  is illustrated as a dashed line in  FIG. 13  and in reality may not be readily discernable in the actual device structure. The epitaxial material  66  will also comprise a same crystal orientation as that of the SOI substrate  52 . In one embodiment, the SOI substrate  52  comprises a silicon substrate having a (110) crystal orientation and the epitaxial material  66  comprises silicon having a (110) crystal orientation.  
         [0033]     Subsequent to the epitaxial growth of material  66 , the structure is planarized as shown in  FIG. 14 . The entire structure is planarized, to remove a portion of epi  66  and to remove ARC/polish stop layer  61  and pad oxide layer  59 , down to the SOI layer  58 , using any suitable planarization technique. For example, the structure  50  could be planarized using chemical mechanical polishing. The planarized surface is indicated by reference numeral  70  in  FIG. 14 .  
         [0034]     Referring now to  FIG. 15 , shallow trench isolation (STI) openings  72  and  74  are formed. The STI openings  72  and  74  are formed across a boundary between the SOI layer  58  (and BOX  56 ) and sidewall spacer  62 . With respect to providing isolation between a subsequently formed P-type and an N-type device, the sidewall spacers  62  alone may provide sufficient isolation. However, STI regions are required between similar type devices.  
         [0035]     Turning now to  FIG. 16 , the STI openings  72  and  74  are filled with suitable shallow trench isolation (STI) material, indicated by reference numerals  76  and  78 , respectively. The STI material may comprise, for example, a deposited oxide, a deposited nitride, or any other suitable STI material. Subsequent to filling the STI openings, the entire structure is again planarized using any suitable planarization technique. The planarized surface is indicated by reference numeral  70  in  FIG. 16 .  
         [0036]     Referring now to  FIG. 17 , semiconductor devices  80  and  82  are formed using any suitable semiconductor processing techniques. Semiconductor devices  80  and  82  are formed in first and second regions, wherein the first region corresponds to a region of the planarized epitaxial material  66  having the first crystal orientation and the second region corresponds to the SOI layer  58  having the second crystal orientation. Device  80  includes, for example, a gate dielectric  84 , gate electrode  86 , sidewall spacers  88 , and source/drain regions  90  and  92 . Similarly, device  82  includes, for example, a gate dielectric  94 , gate electrode  96 , sidewall spacers  98 , and source/drain regions  100  and  102 .  
         [0037]     Semiconductor devices  80  and  82  can comprise any suitable semiconductor devices according to the requirements of a given semiconductor device application and a corresponding manufacturing process. In one embodiment, semiconductor device  80  comprises a P-type device and semiconductor device  82  comprises an N-type device. In addition, the remainder portions of sidewall spacers  62  and the STI regions  76  and  78  form suitable isolation regions, for example, between device  80 , device  82  and possibly other devices (not shown).  
         [0038]     According to one embodiment, a method of making a semiconductor device structure comprises providing a semiconductor substrate, the semiconductor substrate including a first semiconductor layer having a first surface (or crystal) orientation, a first dielectric layer over the first semiconductor layer, a second dielectric layer over the first dielectric layer, and a second semiconductor layer over the second dielectric layer, wherein the second semiconductor layer has a second surface (or crystal) orientation. The method further comprises performing a patterned etch through the second semiconductor layer and the second dielectric layer to form an opening in the second semiconductor layer and the second dielectric layer, wherein the patterned etch is stopped on the first dielectric layer and the patterned etch comprises a first etch type. The method further includes etching through the first dielectric layer to the first semiconductor layer using a second etch type whereby the first semiconductor layer has an exposed portion at the opening, epitaxially growing a semiconductor region of the first surface (or crystal) orientation from the exposed portion into the opening, forming a transistor of the first type in the semiconductor region, and forming a transistor of the second type in the second semiconductor layer.  
         [0039]     In one embodiment, the first dielectric layer has a first thickness, the second dielectric layer has a second thickness, and the second thickness is at least five times greater than the first thickness. In another embodiment, the first dielectric layer comprises a high-K dielectric. In another embodiment, the second etch type comprises a hot gas that contains chlorine, wherein the second etch type is further characterized as being hydrochloric acid, and wherein the second etch type is further characterized as applying the hot gas at a temperature of at least 500 degrees Celsius. In yet another embodiment, the second etch type etches the first dielectric layer at a significantly greater rate than the first semiconductor layer, the second dielectric layer, and the second semiconductor layer.  
         [0040]     In yet another embodiment, the method further comprises, prior to the step of etching through the first dielectric layer, the following steps: filling the opening with an insulating material; and pattern etching through the insulating material to leave a portion of the insulating material along a perimeter of the opening for providing isolation between the first transistor and the second transistor.  
         [0041]     In yet still another embodiment, the method further comprises forming an antireflective coating over the insulating material prior to pattern etching through the insulating material. In still another embodiment, the method further comprises forming a sidewall spacer along a perimeter of the opening prior to the step of etching through the first dielectric layer, removing at least a first portion of the sidewall spacer, and forming an isolation region where the first portion of the sidewall spacer was removed.  
         [0042]     In one embodiment, the first surface orientation comprises (110), the second surface orientation comprises (100), the first type of transistor comprises P channel, the second type of transistor comprises N channel, and the first semiconductor region is of a different material composition from the first semiconductor layer.  
         [0043]     According to a still further embodiment, a method of forming a semiconductor device structure, comprises providing a semiconductor substrate, wherein the semiconductor substrate includes: a first semiconductor layer having a first crystal orientation; a first dielectric layer over the first semiconductor layer; a second dielectric layer over the first dielectric layer; and a second semiconductor layer over the second dielectric layer, wherein the second semiconductor layer has a second crystal orientation. The method further comprises etching through the second semiconductor layer and the second dielectric layer whereby the first dielectric layer has an exposed portion, etching through the first dielectric layer whereby the first semiconductor layer has an exposed portion, and epitaxially growing a semiconductor region from the exposed portion of the first semiconductor layer.  
         [0044]     In one embodiment, the etching through the second dielectric layer comprises applying a fluorine-containing gas, and the step of etching through the first dielectric layer comprises applying a chlorine-containing gas at temperature of at least 500 degrees Celsius.  
         [0045]     In another embodiment, the method further comprises forming a first transistor in the semiconductor region and forming a second transistor in the second semiconductor layer, wherein the second transistor is as different type from the first transistor. In yet another embodiment, the first dielectric layer comprises a high K dielectric layer that is at least five times thicker than the second dielectric layer. The first crystal orientation is a surface orientation of (110) and the second crystal orientation is a surface of orientation of (100).  
         [0046]     In another embodiment, the method further comprises, after etching through the second dielectric layer and prior to etching through the first dielectric layer, the following steps: depositing an insulating material, and pattern etching through the insulating material to the first dielectric layer to leave an opening through the insulating material for the exposed portion of the first insulating layer. In a still further embodiment, wherein the step of etching through the second semiconductor layer and the second dielectric layer leaves an opening, the method further comprises: forming a sidewall spacer along a perimeter of the opening prior to the step of etching through the first dielectric layer, removing at least a first portion of the sidewall spacer, and forming an isolation region where the first portion of the sidewall spacer was removed.  
         [0047]     According to another embodiment, a semiconductor device structure comprises a first semiconductor layer having a first crystal orientation, a semiconductor region extending vertically from the first semiconductor layer, the semiconductor region having the first crystal orientation, and a second semiconductor layer over and parallel to the first semiconductor layer, wherein the second semiconductor layer has a different crystal orientation from the first crystal orientation. The semiconductor device structure also includes a first insulating layer over the first semiconductor layer and around the semiconductor region, wherein the first insulating layer has different etch characteristics from the first semiconductor layer and a second insulating layer over the first insulating layer, under the second semiconductor layer, and around the semiconductor region, wherein the second insulating layer has different etch characteristics from the first insulating layer. The semiconductor device structure further includes a transistor of a first type on the semiconductor region and a transistor of a second type on the second semiconductor layer. According to another embodiment, the semiconductor device further comprises an isolation region between the semiconductor region and the second semiconductor layer, wherein the semiconductor region and the second semiconductor layer have top surfaces that are substantially coplanar and the second insulating layer is at least five times thicker than the first insulating layer.  
         [0048]     In the foregoing specification, the disclosure has been described with reference to the various embodiments. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the present embodiments as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of the present embodiments. For example, the embodiments of the present disclosure enable the fabrication of high quality substrates with dual orientation (DSO) by inserting a dielectric layer between the BOX and the substrate, as discussed herein. The high quality DSO substrates are further formed by a defect-free epi process on define active areas, allowing for high quality enhanced electron and hole mobility in (100) and (110), respectively. Furthermore, a semiconductor device having dual or multiple crystal orientations can include one or more of a transistor, a diode, an optical device, a light emitting diode, or a laser. An integrated circuit can also be formed using one or more of the methods according to the embodiments herein. Still further, while first and second crystallographic orientations have been described herein as being different from one another, in another embodiment, the first and second crystallographic orientations could be the same and do not have to differ.  
         [0049]     Benefits, other advantages, and solutions to problems have been described herein above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any element(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature or element of any or all the claims. As used herein, the term “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Technology Category: 5