Abstract
The photoconductivity of phenosafranin (C18H15N4Cl) dye doped solid-state polymer photo-electrochemical cell (PEC) has been studied here. The cell contains a blend made of the dye dispersed in polyvinyl alcohol (PVA), polyethylene oxide (PEO) complexed with lithium perchlorate (LiClO4) ion salt as solid electrolyte with ethylene carbonate (EC) and propylene carbonate (PC) as plasticizers. A thin film (∼200 nm) of the above blend is sandwiched between a transparent indium-tin-oxide (ITO) coated glass plate and an aluminium plate, which act as two contact electrodes. The photoresponse is observed on application of different external voltages on the device illuminated by a tungsten lamp. In the present study, we have concentrated on the steady state dark I-V characteristics as well as dark I-t characteristics of the device. The growth and decay of the photocurrent at low and high bias voltages has also been observed. The present photoconductivity study provides indepth knowledge on complex charge transport process of these materials.
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