Semiconductor sensor structures with reduced dislocation defect densities
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01L-027/146
H01L-027/144
H01L-031/0304
H01L-031/0312
H01L-031/103
H01L-031/105
H01L-021/02
H01L-021/762
출원번호
US-0333204
(2014-07-16)
등록번호
US-9105549
(2015-08-11)
발명자
/ 주소
Cheng, Zhiyuan
Fiorenza, James
Sheen, Calvin
Lochtefeld, Anthony J.
출원인 / 주소
Taiwan Semiconductor Manufacturing Company, Ltd.
대리인 / 주소
Slater & Matsil, L.L.P.
인용정보
피인용 횟수 :
0인용 특허 :
257
초록▼
Non-silicon based semiconductor devices are integrated into silicon fabrication processes by using aspect-ratio-trapping materials. Non-silicon light-sensing devices in a least a portion of a crystalline material can output electrons generated by light absorption therein. Exemplary light-sensing dev
Non-silicon based semiconductor devices are integrated into silicon fabrication processes by using aspect-ratio-trapping materials. Non-silicon light-sensing devices in a least a portion of a crystalline material can output electrons generated by light absorption therein. Exemplary light-sensing devices can have relatively large micron dimensions. As an exemplary application, complementary-metal-oxide-semiconductor photodetectors are formed on a silicon substrate by incorporating an aspect-ratio-trapping technique.
대표청구항▼
1. A circuit structure comprising: a transistor disposed in a substrate, the substrate comprising a first crystalline semiconductor material, the transistor comprising a first source/drain region disposed in the first crystalline semiconductor material and a gate structure disposed on the first crys
1. A circuit structure comprising: a transistor disposed in a substrate, the substrate comprising a first crystalline semiconductor material, the transistor comprising a first source/drain region disposed in the first crystalline semiconductor material and a gate structure disposed on the first crystalline semiconductor material; anda photo-sensor disposed in a second crystalline semiconductor material, the second crystalline semiconductor material being lattice mismatched to the first crystalline semiconductor material, the second crystalline semiconductor material being disposed at least partially in a recess of the first crystalline semiconductor material, the photo-sensor being electrically coupled to the gate structure of the transistor. 2. The circuit structure of claim 1, wherein the recess of the first crystalline semiconductor material has a dielectric material along sidewalls of the recess. 3. The circuit structure of claim 1, wherein a dielectric material is disposed along a bottom surface of the recess of the first crystalline semiconductor material, an opening being defined through the dielectric material to the bottom surface of the recess, the second crystalline semiconductor material being disposed at least partially in the opening. 4. The circuit structure of claim 1, wherein a dielectric material is disposed along a bottom surface of the recess of the first crystalline semiconductor material, a plurality of openings being defined through the dielectric material to the bottom surface of the recess, the second crystalline semiconductor material being disposed at least partially in each of the plurality of openings. 5. The circuit structure of claim 1, wherein the second crystalline semiconductor material comprises defects arising from lattice-mismatch to the first crystalline semiconductor material, the defects being trapped at sidewalls of the recess. 6. The circuit structure of claim 1 further comprising a graded buffer material disposed in the recess of the first crystalline semiconductor material, the second crystalline semiconductor material being disposed on the graded buffer material. 7. The circuit structure of claim 1, wherein the photo-sensor comprises a p-i-n structure in the second crystalline semiconductor material. 8. A sensor structure comprising: a sensor array comprising a plurality of cells, each cell comprising: a cell region on a substrate, the cell region comprising a first crystalline semiconductor material and a second crystalline semiconductor material, the first crystalline semiconductor material being lattice mismatched to the second crystalline semiconductor material,a first transistor comprising a first source/drain region disposed in the first crystalline semiconductor material, anda photo-sensor disposed in the second crystalline semiconductor material, the first transistor being electrically coupled to the photo-sensor. 9. The sensor structure of claim 8, wherein the substrate comprises the first crystalline semiconductor material, the second crystalline semiconductor material being disposed at least partially in a recess in the first crystalline semiconductor material. 10. The sensor structure of claim 9, wherein the second crystalline semiconductor material adjoins the first crystalline semiconductor material, the second crystalline semiconductor material comprising defects arising from lattice-mismatch to the first crystalline semiconductor material, the defects being trapped at sidewalls of the recess. 11. The sensor structure of claim 9 further comprising a graded buffer material disposed in the recess of the first crystalline semiconductor material, the second crystalline semiconductor material being disposed on the graded buffer material. 12. The sensor structure of claim 8, wherein a top surface of the first crystalline semiconductor material is co-planar with a top surface of the second crystalline semiconductor material. 13. The sensor structure of claim 8 further comprising a second transistor having a second source/drain region disposed in a third crystalline semiconductor material, the first crystalline semiconductor material being lattice mismatched to the third crystalline semiconductor material. 14. The sensor structure of claim 8, wherein each cell further comprises a second transistor, the first transistor comprising a first gate, the first source/drain region, and a second source/drain region, the second transistor comprising a second gate, a third source/drain region, and a fourth source/drain region, the first gate being coupled to the photo-sensor, the second gate being coupled to a row-select node, the first source/drain region being coupled to a power supply node, the second source/drain region being coupled to the third source/drain region, and the fourth source/drain region being coupled to a column-select/sense node. 15. The sensor structure of claim 8 further comprising: column-select transistors, each column of the plurality of cells having a respective column-select transistor; androw-select transistors, each row of the plurality of cells having a respective row-select transistor. 16. A structure comprising: a trench comprising dielectric sidewalls and a crystalline bottom surface, the crystalline bottom surface comprising a first crystalline semiconductor material;a second crystalline semiconductor material disposed at least partially in the trench, the second crystalline semiconductor material having a defect region proximate an interface between the first crystalline semiconductor material and the second crystalline semiconductor material, the defect region comprising dislocation defects arising from a lattice mismatch between the first crystalline semiconductor material and the second crystalline semiconductor material, the dislocation defects terminating at the dielectric sidewalls, the second crystalline semiconductor material having a dislocation defect-free region substantially free from dislocation defects and distal from the interface between the first crystalline semiconductor material and the second crystalline semiconductor material; anda photo-sensor disposed in the second crystalline semiconductor material, the photo-sensor having a p-doped region, an intrinsic region, and a n-doped region. 17. The structure of claim 16, wherein the p-doped region and the n-doped region are disposed in the dislocation defect-free region of the second crystalline semiconductor material, the p-doped region being disposed at a surface of the second crystalline semiconductor material distal from the interface, the n-doped region being disposed at the surface of the second crystalline semiconductor material distal from the interface, at least a portion of the intrinsic region being disposed at the surface of the second crystalline semiconductor material distal from the interface and between the n-doped region and the p-doped region. 18. The structure of claim 16, wherein the p-doped region is disposed in the defect region and at least partially in the dislocation defect-free region, and the n-doped region is disposed in the dislocation defect-free region of the second crystalline semiconductor material and at a surface of the second crystalline semiconductor material distal from the interface, the intrinsic region being disposed in the dislocation defect-free region of the second crystalline semiconductor material and between the n-doped region and the p-doped region. 19. The structure of claim 16, wherein the trench is in a dielectric layer on a top surface of a substrate, the substrate comprising the first crystalline semiconductor material. 20. The structure of claim 16, wherein the trench is in a recess of a substrate, the substrate comprising the first crystalline semiconductor material.
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