OBSERVATION OF BAND-HOPPING TRANSITION FOR ELECTRONS IN NAPHTHALENE

Transient photoconductivity has been used to measure the electron drift mobility in the c′ direction of single-crystal naphtalene from 54 to 324 K. Below 100 K the mobility rises exponentially with decreasing temperature, an effect which we attribute to the onset of band-type motion limited by optical-phonon scattering. This observation allows the identification of the approximately constant mobility at higher temperatures (T>100 K) with the hopping of localized charge carriers. © 1978 The American Physical Society.