Abstract
We have studied the intermolecular carrier transport in films. Photoelectrical and optical experiments indicate charge transfer transitions to set in at photon energies of ∼2.2 eV. The electron transport in the charge transfer state is by hopping with typical drift mobilities of 1 /V s in as-grown films. Hole drift mobilities are in the range. Upon oxygen exposure the carrier mobilities decrease significantly, while recombination lifetimes grow. These findings are interpreted as being due to transport-limited recombination kinetics.
- Received 11 August 1998
DOI:https://doi.org/10.1103/PhysRevB.60.11804
©1999 American Physical Society