US6326650B1
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Method of forming a semiconductor structure
Assignee: Hitachi Europe Ltd
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Filing: 1996-07-30
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Granted: 2001-12-04
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Expires: 2016-07-30
Abstract
Abstract Semiconductor structures and a method of forming semiconductor structures The avalanche breakdown characteristics, such as breakdown voltage and impact ionisation coefficient, of a semiconductor structure can be controlled by controlling the Brillouin-zone-averaged energy bandgap (<Ec>) of the material forming the structure. Consequently, the avalanche breakdown characteristics of a device may be tailored independently of the bandgap Eg. The Brillouin-zone-averaged energy bandgap (<Ec>) may be controlled by controlling the composition of the semiconductor used or by straining its lattice.
Inventors
- 👤 Jeremy Allam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:43
CPC Classifications
H; H10; H10D; H10D8/00; H10D8/40; H10D10/00; H10D10/80; H10D30/00; H10D30/40; H10D30/47; H10D30/471; H10D30/473; H10D30/4732; H10D62/00; H10D62/80; H10D62/81; H10D62/815; H10D62/8161; H10D62/8162; H10D62/8164; H10D8/50; H10D62/85; H10D62/8503
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
215 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting a value of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the selected value of <E c > and a second binary material with a value of <E c > lower than the selected value of <E c >, wherein the first and second binary materials share one element and are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, the composition of a ternary alloy having the selected value of <E c > and fabricating said portion of the structure from said ternary material.
Claim 2
Independent Claim
215 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting a value of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the selected value of <E c > and a second binary material with a value of <E c > lower than the selected value of <E c >, wherein the first and second binary materials share one element and are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, the composition of a ternary alloy having the selected value of <E c > and fabricating said portion of the structure from said ternary material.
Claim 3
Dependent Claim
37 words
A method of fabricating a semiconductor structure device according to claim 1 wherein the device is selected from the group consisting essentially of field effect transistors, bipolar transistors, avalanche photodiodes and impact ionisation avalanche transit time diodes.
Claim 4
Independent Claim
250 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting a value of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the selected value of <E c > and a second binary material with a value of <E c > lower than the selected value of <E c >, wherein the first and second binary materials share one element and are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, the composition of a ternary alloy having a value <E c > not to equal to the selected value of <E c > and fabricating said portion of the structure from said ternary material under strain such that the strain causes the ternary alloy to have a value <E c > equal to the selected value of <E c >.
Claim 5
Independent Claim
250 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting a value of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the selected value of <E c > and a second binary material with a value of <E c > lower than the selected value of <E c >, wherein the first and second binary materials share one element and are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, the composition of a ternary alloy having a value <E c > not to equal to the selected value of <E c > and fabricating said portion of the structure from said ternary material under strain such that the strain causes the ternary alloy to have a value <E c > equal to the selected value of <E c >.
Claim 6
Dependent Claim
37 words
A method of fabricating a semiconductor structure device according to claim 3 wherein the device is selected from the group consisting essentially of field effect transistors, bipolar transistors, avalanche photodiodes and impact ionisation avalanche transit time diodes.
Claim 7
Independent Claim
252 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting first and second values of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the first and second selected values of <E c > and a second binary material with a value of <E c > lower than the first and second selected value of <E c >, wherein the first and second binary materials share one element and are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, a first composition of a ternary alloy having the first selected value of <E c > and a second composition of the ternary alloy having the selected value of <E c > and fabricating said portion of the structure by spatially grading the composition of the ternary alloy between the first and second compositions.
Claim 8
Independent Claim
252 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting first and second values of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the first and second selected values of <E c > and a second binary material with a value of <E c > lower than the first and second selected value of <E c >, wherein the first and second binary materials share one element and are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, a first composition of a ternary alloy having the first selected value of <E c > and a second composition of the ternary alloy having the selected value of <E c > and fabricating said portion of the structure by spatially grading the composition of the ternary alloy between the first and second compositions.
Claim 9
Dependent Claim
37 words
A method of fabricating a semiconductor structure device according to claim 5 wherein the device is selected from the group consisting essentially of field effect transistors, bipolar transistors, avalanche photodiodes and impact ionisation avalanche transit time diodes.
Claim 10
Independent Claim
319 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting first and second values of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the first selected value of <E c > and a second binary material with a value of <E c > lower than the first selected value of <E c >, selecting a third binary material with a value of <E c > higher than the second selected value of <E c > and a fourth binary material with a value of <E c > lower than the second selected value of <E c >, wherein the first and second binary materials share one element and the third and fourth binary materials share one element and said first, second third and fourth binary materials are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, a composition of a first ternary alloy having the first selected value of <E c >, determining by interpolation between the third and fourth binary materials, a composition of a second ternary alloy having the second selected value of <E c > and fabricating said portion of the structure by spatially alternating layers of the first ternary alloy and the second ternary alloy.
Claim 11
Independent Claim
319 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting first and second values of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first binary material with a value of <E c > higher than the first selected value of <E c > and a second binary material with a value of <E c > lower than the first selected value of <E c >, selecting a third binary material with a value of <E c > higher than the second selected value of <E c > and a fourth binary material with a value of <E c > lower than the second selected value of <E c >, wherein the first and second binary materials share one element and the third and fourth binary materials share one element and said first, second third and fourth binary materials are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, a composition of a first ternary alloy having the first selected value of <E c >, determining by interpolation between the third and fourth binary materials, a composition of a second ternary alloy having the second selected value of <E c > and fabricating said portion of the structure by spatially alternating layers of the first ternary alloy and the second ternary alloy.
Claim 12
Dependent Claim
28 words
A method according to claim 7 wherein the selecting of the first and second values of <E c > comprises choosing the same value of <E c >.
Claim 13
Dependent Claim
37 words
A method of fabricating a semiconductor structure device according to claim 7 wherein the device is selected from the group consisting essentially of field effect transistors, bipolar transistors, avalanche photodiodes and impact ionisation avalanche transit time diodes.
Claim 14
Independent Claim
249 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting first and second values of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first material with a value of <E c > higher than the first selected value of <E c > and a second material with a value of <E c > lower than the first selected value of <E c >, selecting a third material the second selected value of <E c >, wherein the first and second materials are binary material which share one element and said first, second and third materials are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, a composition of a first ternary alloy having the first selected value of <E c > and fabricating said portion of the structure by spatially alternating layers of the first ternary alloy and the third material.
Claim 15
Independent Claim
249 words
A method of fabricating a semiconductor structure device with a predetermined architecture and functionality, comprising: selecting first and second values of Brillouin-zone-averaged energy bandgap (<E c >) for a functional part of the structure; selecting a first material with a value of <E c > higher than the first selected value of <E c > and a second material with a value of <E c > lower than the first selected value of <E c >, selecting a third material the second selected value of <E c >, wherein the first and second materials are binary material which share one element and said first, second and third materials are selected from: <E g > <E c > Material (eV) (eV) Si 1.17 2.09 Ge 0.74 0.97 BN 5.81 8.96 BP 2.04 3.34 BAs 1.55 2.72 AIN 4.54 6.52 GaN 3.25 4.79 AIP 2.50 3.24 AIAs 2.23 2.41 AISb 1.68 2.09 GaP 2.39 2.58 GaAs 1.52 1.77 GaSb 0.80 0.99 InP 1.42 2.09 InAs 0.41 1.51 InSb 0.23 1.03 Al .5 Ga .5 As 2.09 2.01 In .53 Ga .47 As 0.81 1.68 ZnS 3.80 4.65 ZnSe 2.96 3.78 ZnTe 2.71 2.97 CdS 2.55 4.30 CdSe 1.90 3.56 CdTe 1.92 2.78 HgTe 0.00 1.49 determining by interpolation between the first and second binary materials, a composition of a first ternary alloy having the first selected value of <E c > and fabricating said portion of the structure by spatially alternating layers of the first ternary alloy and the third material.
Claim 16
Dependent Claim
28 words
A method according to claim 10 wherein the selecting of the first and second values of <E c > comprises choosing the same value of <E c >.
Claim 17
Dependent Claim
37 words
A method of fabricating a semiconductor structure device according to claim 10 wherein the device is selected from the group consisting essentially of field effect transistors, bipolar transistors, avalanche photodiodes and impact ionisation avalanche transit time diodes.
Claim 18
Independent Claim
103 words
A method of forming a semiconductor structure comprising forming the structure such that the Brillouin-zone-averaged energy bandgap (<E c >) of at least a portion of thereof is controlled so as to provide a predetermined avalanche breakdown characteristic therefor, wherein (<E c >) of said portion is selected according to the following relationship: ( E c ) = ( V b + m ) n where V b is the predetermined breakdown voltage, and m and n are constants and wherein the structure is a p-i-n diode having a 1 μm wide i region, m is approximately 45.8 and n is approximately 46.3.
Claim 19
Independent Claim
103 words
A method of forming a semiconductor structure comprising forming the structure such that the Brillouin-zone-averaged energy bandgap (<E c >) of at least a portion of thereof is controlled so as to provide a predetermined avalanche breakdown characteristic therefor, wherein (<E c >) of said portion is selected according to the following relationship: ( E c ) = ( V b + m ) n where V b is the predetermined breakdown voltage, and m and n are constants and wherein the structure is a p-i-n diode having a 1 μm wide i region, m is approximately 45.8 and n is approximately 46.3.
References Cited (Backward Citations)
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