Charge Mobility in Pyrene Crystals

Abstract

To estimate the charge mobility in a direction perpendicular to the ab plane in the sixteen atoms of the aromatic hydrocarbon crystal, pyrene, the overlap integrals between two molecules have been calculated. On the basis of these results, the hole mobility (μh) has been found to be twice that of the electron mobility (μe). However, judging from the transient photocurrent of the pyrene crystal, μe (∼3 cm2/V. sec.) was considerably larger than μh (1.2cm2/V. sec). This discrepancy may be eliminated by the introduction of a more accurate theoretical treatment.