Sensitized Photocurrent in Dye-Deposited Poly-(N-Vinylcarbazole)
Photo-induced charge transfer has been studied which takes place at interface of dye and poly-(N-vinylcarbazole) (PVK). The charge transfer produces an anomalous spike in photocurrent at the early stage of illumination. Its polarity is determined solely by the type of dye employed and the magnitude is independent on the external field across the double-layer of dye and PVK. Oxygen and other electron acceptors are found to suppress the spike to appear though they assist the steady photocurrent to grow. On the basis of these findings, a mechanism of dye-sensitized photoconductivity in PVK will be discussed.
KeywordsCharge Transfer Electron Acceptor External Field Diphenyl Amine Silver Electrode
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