Abstract
Photoreflectance and impedance spectroscopy were used to characterize and photomodified electrodes. The top film of the electrode modified in Cu‐polyiodide has a 1.93 eV energy gap, which is consistent with that of . After modification, the doping density was reduced and the flatband potential was shifted from −0.33V vs. Pt to −0.50V vs.Pt. The modified layer acts as a window for that cleans the interface of trapping centers. The removal of surface states is the predominant mechanism responsible for the improvements in the photoelectrochemical response. An obvious constant phase angle behavior was observed in electrodes; it was analyzed based on the diffusion of the minority carrier under forward bias.
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