Abstract
The absence of stable oxide/GaAs interface greatly holds back the step of GaAs-based MOSFETs fabrication. In this letter, we report on the chemical passivation of n-type GaAs surface by introducing a new sulfuration method. X-ray photon-electron spectroscopy (XPS) analyses indicate that most GaAs native oxides and elemental arsenic (As) can be more effectively removed by treating the GaAs surface in CH3CSNH2 solution compared to the traditional (NH4)2S solution. Capacitance-Voltage characteristics of the CH3CSNH2 treated MOS capacitors also presents reduced interfacial layer and equivalent oxide thickness which are well consisted with the conclusion obtained by XPS.
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