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- W2092183893 abstract "Abstract Steady state and transient characteristics of photoconductivity have been studied in amorphous thin films of Se 85 Te 15− x Pb x ( x = 0, 2, 4 and 6). The studies of temperature dependence of photoconductivity show that photoconduction is a thermally activated process. The value of activation energy of photoconduction is, however, smaller as compared to activation energy in dark. The results of intensity dependence of steady state photoconductivity indicate that bimolecular recombination is predominant in these materials. The Se 85 Te 15− x Pb x is found highly composition dependent as lead impurity drastically changes the conduction parameters. The incorporation of Pb impurity is found to affect the transient photoconductivity properties drastically. A spike is observed in the rise curve of photocurrent in undoped a-Se 85 Te 15 , which disappears in Pb doped samples. The lead incorporation is found to delay the onset time of recombination in the rise and decay of photocurrent which is attributed to the trapping of charge carriers in deep localized states produced by lead impurity. The photocurrent rise and decay is explained by the trap-controlled recombination model proposed by Iovu et al. and the dispersion parameter α of localized state energy distribution is determined from the experimental results." @default.
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- W2092183893 date "2005-11-01" @default.
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- W2092183893 title "Effect of lead additive on photoconductive properties of Se–Te chalcogenide films" @default.
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- W2092183893 doi "https://doi.org/10.1016/j.jnoncrysol.2005.09.011" @default.
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