Abstract
Abstract Surface states in p-type CuI thiocyanate (CuSCN) were detected from I−V characteristics, diffuse reflectance spectra, and photocurrent action spectra. The p-CuSCN films are sensitized by rhodamine with octadecyl-alkyl chain, and the sensitized photocurrent is observed with the visible light illumination. In spite of the surface states in p-CuSCN, the maximum photocurrent quantum efficiency (gfmax) at λ = 560 nm, in 1 × 10−4 M KI + I2 solution, pH = 6, reached ∼ 8.6%, where the surface dye concentration of photocathode Cu/p-CuSCN/Dye was 1.1 × 1014 molecules cm−2. Photocathodes were biased at −0.25 V versus AgCl/Ag to give a zero dark current. From the variation of φ values with the reduction potential of electron acceptors, the cathodic sensitization mechanism presented is further confirmed.
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