Low-temperature dry etching of tungsten,dielectric, and trilevel resist layers on GaAs |
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Authors: | Pearton S J Abernathy C R Ren F Lothian J R Kopf R F |
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Institution: | (1) University of Florida, 32611 Gainesville, Florida;(2) AT&T Bell Laboratories, 07974 Murray Hill, New Jersey |
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Abstract: | Dry etching of common masking materials used in GaAs device technology, was examined down to temperatures of –30°C. The etch rates of SiNx, SiO2, and W in SF6/Ar are reduced below 0°C, but the anisotropy of the etching is improved at low temperature. Microwave enhancement of the SF6/Ar discharges produces increases in etch rates of several times at 25°C, but much lower increases at –30°C substrate temperature. The underlying GaAs surface shows increased S and F coverage after low-temperature etching, but these species are readily removerd either by anex-situ wet chemical cleaning step or an in-situ H2 plasma exposure. Photoresist etching is less sensitive to temperature, and anisotropic profiles are produced between –30 and +60°C in pure O2 discharges. |
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Keywords: | Plasma etching GaAs devices low temperature |
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