p‐Type GaP electrodes with and without metal adatoms showed noticeable photoresponse at wavelengths longer than the intrinsic absorption threshold, if surface states were formed by hydrogen impregnation. The formation mechanism of the surface states was analyzed and the role of metal adatoms was evaluated. The energy levels of the surface states formed are determined by analysis of the cathodic current in the dark.
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Uchida et al. (1980) studied this question.