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YinHuang 发表于 2008-8-30 02:11

Steady-state and impedance study of n-GaAs in H2SO4 solution: Mechanism analysis

Abstract

In this paper, a study on the electrochemical impedance of anodic decomposition of n-GaAs in 0.5 M sulfuric acid, combined with steady-state polarization techniques, is presented. Both dark and daylight conditions have been investigated for comparison of their influence on polarization curves and impedance by hole injection in a potential range from open circuit to breakdown. An inductive loop appears if a high enough positive potential is applied for both conditions, while recombination resistance is only observed for the daylight case. Quantitative simulation of the impedance spectra suggests that the rate-determining step for corrosion/photocorrosion is the generation of mobile intermediates, e.g., AsGa+, which are then replaced by competition between a Faradaic process involving immobile intermediate formation and a parallel chemical step to form AsGa–OH.

Keywords: Gallium arsenide; Corrosion mechanism; Impedance; Inductive loop

cc136520 发表于 2008-8-30 10:35

welcome to chem8

happyboy2008 发表于 2008-8-30 11:16

it is interesting!

zjniu 发表于 2008-8-30 13:25

Welcome to Chem8:zz14)

Metalcarbene 发表于 2008-9-1 04:34

Welcome new QM from Canada

sulfur 发表于 2008-9-24 22:43

Welcome

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