Effect of sodium sulfide treatment on band bending in GaAs

Besser, R. S.; Helms, C. R.
May 1988
Applied Physics Letters;5/16/1988, Vol. 52 Issue 20, p1707
Academic Journal
Recent evidence suggests that sodium sulfide treatment of GaAs surfaces results in the reduction of surface recombination and in Fermi level unpinning. We have used a surface conductivity technique to measure the Fermi level position of samples with and without sodium sulfide treatment. This method has specific advantages over spectroscopic techniques for studying thin films on GaAs. Photoluminescence (PL) measurements were used to qualitatively evaluate surface recombination. We conclude that while the reduction of surface recombination is attained, the surface is not unpinned.


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