Abstract
The photocurrent and spectral response characteristics of galliumarsenide (GaAs) are obtained by a multi-information measurement system,and the evolution of the photocurrent versus the Cs:O flux ratio isinvestigated. The experimental results show that the photocurrentincreases approximately exponentially after the first exposure to Csuntil a maximum sensitivity is reached, the detailed evolution processand the ultimate photocurrent are different for different samples.These differences are analysed, and according to the process ofcoadsorption of Cs and oxygen on GaAs, an equation is presented toexplain the increase of photocurrent.
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