Abstract
Abstract A photogenerated electron-hole pair is supposed to evolve within 10−13 s into a soliton-antisoliton pair1 and then, as deduced from photoinduced absorption measurements2, to form either two neutral spin 1/2 SSH solitons or to separate into two charged solitons on neighbouring chains by interchain charge transfer. The efficiency of the interchain charge transfer and therefore the generation of charged solitons was determined to be ≲ 10−2. Since (CH)X shows light induced conductivity and since the charged solitons are the only species which move in the electric field we have tried to use photoconductivity techniques to complement the photoinduced absorption measurements by determining the quantum efficiency and also by trying to obtain information on the lifetime and mobility of the photoexcited species. The quantum efficiency as determined by photoconduction gives the fraction of excited electron-hole pairs which goes into conducting states and thus also the fraction which is left in bound states ...
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