Electric-Field-Dependent Charge-Carrier Trapping in a One-Dimensional Organic Solid

Abstract

The relaxation of photoconduction in a polydiacetylene crystal containing a high density of defects is shown to follow the predictions of the theory for field-dependent diffusion in one dimension. At intermediate times and fields an $\exp [-3\mathrm{}{\left(\frac{t}{{\tau }_1}\right)}^{\frac{1}{3}}]$ law is observed merging into an $\exp \left(\frac{-t}{{\tau }_2}\right)$ behavior as $t\to \infty$. The predicted functional change of ${\tau }_2\mathrm{}\left(E\right)\mathrm{}$ at a critical field is recovered.