Abstract
A new method aimed at the estimation of an electron-hole exchange interaction distance in organic and possibly other semi-conductors is developed. It is based on studying the temperature dependence of the spin magnetic field effect on the photoconductivity. Photoexcitation of the polydiacetylene single crystal which is a quasi-dimensional semiconductor is shown to result in an appearance of delocalized on 70 Å intermolecular charge transfer states the latter being precursors of free charge carriers. The energy of the CT states is estimated to be 0.12 eV below a conduction band. Spin evolution in the correlated electron-hole pair is shown to proceed when the e–h distance is up to 1600 Å.
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