The effect of including the interchain hopping integral, t⊥, on the interaction and photoexcitation of defects in trans-polyacetylene is considered. The anisotropic absorption coefficients (due to electron-hole photogeneration), α||and α⊥, are calculated, the resultant anisotropy being in good agreement with experiment. To account for the form of α⊥, it is found that adjacent chains must align out of phase, in which case the subsequent interaction of defects due to interchain hopping is very weak. It is also shown that α⊥is dominated by interchain transitions when excited near the band gap, supporting the model for the preferential photogeneration of defects by E⊥, where intrachain defects are expected to recombine quickly, while interchain defects are expected to produce longer-lived charge carriers. © 1987.
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