WSe 2 crystals (photo-electrodes) have been grown via a vapour transport technique, employing SeCl 4 as transporter photo-electrochemical (PEC) solar cells with n-WSe 2 /I - , I 2 /Pt have been fabricated. In order to improve upon the efficiency, the effective WSe 2 crystal surfaces have been etched in aqua-regia. The authors have obtained a high PEC conversion efficiency, up to 17.1%. This corresponds to the most efficient WSe 2 -based PEC solar cell reported so far. Evidence and arguments have been presented to show that the high efficiency ( approximately 17.1%) is achieved due to the combined effect of improved crystal quality, obtained through a SeCl 4 transporter, and a decrease in the density of surface steps consequent to photo-etching.
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Prasad et al. (1988) studied this question.
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