Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1978-03-30
1979-03-06
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041294, 20412995, C25F 312, C25F 314
Patent
active
041429532
ABSTRACT:
KOH can be used as the electrolyte for self-limiting etching of GaAs to preferentially remove p-type material from n-type material but does not work with GaAlAs because etching is halted by the precipitation of aluminium hydroxide. An aqueous solution of triethanolamine has been found to be an alternative electrolyte which does not suffer from this problem. Preferably no external drive voltage is used but instead the current flow is promoted by the e.m.f. developed by the etching cell itself.
REFERENCES:
patent: 3184399 (1965-05-01), Schnable et al.
patent: 3251757 (1966-05-01), Schmitz
patent: 3413205 (1968-11-01), Hardman
patent: 3421987 (1969-01-01), La Boda
patent: 3791948 (1974-02-01), Dixon et al.
patent: 3959098 (1976-05-01), Schwartz
IT&T Industries, Inc.
O'Halloran John T.
Tufariello T. M.
Van Der Sluys Peter C.
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