Abstract
Photoconductivity in poly(o-trimethylsilylphenylacetylene) (PTMsiPA) is enhanced intensively by small amount of C 60 doping at three wavelength ranges corresponding to (a) forbidden transition (1.8eV) between h u and t 1u states of C 60, (b) inter-band transition (>2eV) in PTMSiPA and (c) allowed transition (3.5eV) between h u and t 1g levels of C 60. Remarkable polarity effect of applied voltage is observed in the photoconduction spectra in C 60 doped PTMSiPA due to uniform carrier excitation in range (a) and non-uniform carrier excitation in range (b) and (c), proving that positively charged carriers (S + solitons) are mainly contributing to photoconductivity. These results are discussed in terms of photo-induced charge transfer between PTMSiPA and C 60, taking into account the role of photoexcited polarons and charges solitons S + in polymeric chains.
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