Abstract
In thin films, the steady-state photoconductivity is temperature independent in agreement with transient photoconductivity in the subnanosecond regime. As thickness is increased, an activated dependence emerges. The independence of the product of the carrier density times the mobility for thin films results from carrier sweep-out prior to trapping; the crossover from -independent to activated occurs when the transit time across the film is comparable to the time required for deep trapping. Thus, steady-state photoconductivity confirms that, in semiconducting polymers, the carrier generation mechanism is independent, inconsistent with the Onsager model of photocarrier generation.
- Received 20 October 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.2685
©1998 American Physical Society