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Patent US4801557A successfully refreshed from Google Patents.
US4801557A
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Vapor-phase epitaxy of indium phosphide and other compounds using flow-rate modulation
Assignee: Northwestern University
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Filing: 1987-06-23
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Granted: 1989-01-31
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Expires: 2007-06-23
Abstract
Abstract Chemical vapor deposition of III-V and II-VI binary, ternary and quaternary compounds is facilitated by maintaining a relatively high flow rate of reactants and modulating the rate of flow by alternately directing the flow at the high rate into a reactor for use and then directing the flow to a vent. Growth rates of the order of 25 Angstroms per minute were achieved in the epitaxial growth of indium phosphide by flow-rate modulation. This produced crystals of device quality having measured carrier mobilities of 2850-3600. In the case of epitaxial growth of ternary and quaternary compounds, improved control of deposition rates is achieved by applying flow-rate modulation to the compound carriers of each of the Group V and VI elements.
Inventors
- 👤 Bruce W. Wessels
- 👤 Pei-Jih Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:08
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/02; C30B25/14; Y; Y10; Y10S; Y10S148/00; Y10S148/057; Y10S148/119; Y10S438/00; Y10S438/935
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
188 words
A method of effecting epitaxial growth of a crystal on a crystalline substrate comprising the steps of: a. passing a continuous flow of a mixture of a first carrier gas and an active gas over a heated container containing a metal to form a vapor stream containing a compound of the metal; b. producing a flow of a second carrier gas and a first reactant gas; c. modulating the flow of the first reactant gas to produce a repeatedly interrupted flow of the first reactant gas at a predetermined frequency and duty cycle; d. mixing the flow of the second carrier gas and the modulated flow of the first reactant gas with the vapor stream in a reaction region; e. continuously directing the mixed flow of the vapor stream, the second carrier gas and the modulated flow of the first reactant gas from the reaction region into a deposition region containing the crystalline substrate heated to a predetermined temperature; and f. venting the mixed flow from the deposition region, whereby a compound of the active gas and the first reactant gas is deposited epitaxially on the crystalline substrate.
Claim 2
Independent Claim
188 words
A method of effecting epitaxial growth of a crystal on a crystalline substrate comprising the steps of: a. passing a continuous flow of a mixture of a first carrier gas and an active gas over a heated container containing a metal to form a vapor stream containing a compound of the metal; b. producing a flow of a second carrier gas and a first reactant gas; c. modulating the flow of the first reactant gas to produce a repeatedly interrupted flow of the first reactant gas at a predetermined frequency and duty cycle; d. mixing the flow of the second carrier gas and the modulated flow of the first reactant gas with the vapor stream in a reaction region; e. continuously directing the mixed flow of the vapor stream, the second carrier gas and the modulated flow of the first reactant gas from the reaction region into a deposition region containing the crystalline substrate heated to a predetermined temperature; and f. venting the mixed flow from the deposition region, whereby a compound of the active gas and the first reactant gas is deposited epitaxially on the crystalline substrate.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the first and second carrier gases are hydrogen.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the active gas is hydrogen chloride.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein the metal is indium.
Claim 6
Dependent Claim
10 words
The method of claim 3 wherein the metal is gallium.
Claim 7
Dependent Claim
12 words
The method of claim 4 wherein the first reactant gas is phosphine.
Claim 8
Dependent Claim
12 words
The method of claim 4 wherein the first reactant gas is arsine.
Claim 9
Dependent Claim
12 words
The method of claim 4 wherein the first reactant gas is bismuthine.
Claim 10
Dependent Claim
12 words
The method of claim 5 wherein the first reactant gas is phosphine.
Claim 11
Dependent Claim
12 words
The method of claim 5 wherein the first reactant gas is arsine.
Claim 12
Dependent Claim
12 words
The method of claim 5 wherein the first reactant gas is bismuthine.
Claim 13
Dependent Claim
35 words
The method of claim 6 wherein the step of modulating comprises the step of directing the flow of the phosphine into the second hydrogen flow during an on-time and into a vent during an off-time.
Claim 14
Dependent Claim
112 words
The method of claim 1 comprising in addition the steps of: a. producing a flow of a third carrier gas and a second reactant gas; b. modulating the flow of the second reactant gas at a second predetermined frequency and duty cycle; c. mixing the modulated flow of the second reactant gas and the flow of the third carrier gas with the mixed flow of the vapor stream, the second carrier gas and the modulated flow of the first reactant gas in the reaction region to produce a second mixed flow; d. directing the second mixed flow into the deposition region; and e. venting the secod mixed flow from the deposition region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |