title: Variable range hopping conduction in semiconductor nanocrystal solids.
abstract: The temperature and electrical field dependent conductivity of n-type CdSe nanocrystal thin films is investigated. In the low electrical field regime, the conductivity follows sigma approximately exp([-(T(*)/T)(1/2)] in the temperature range 10<T<120 K. At high electrical field, the conductivity is strongly field dependent. At 4 K, the conductance increases by 8 orders of magnitude over one decade of bias. At a very high field, conductivity is temperature independent with sigma approximately exp([-(E(*)/E)(1/2)]. The complete behavior is very well described by variable range hopping with a Coulomb gap.
authors.affiliation: James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Dong
authors.initials: D
authors.lastname: Yu
authors.forename: Congjun
authors.initials: C
authors.lastname: Wang
authors.forename: Brian L
authors.initials: BL
authors.lastname: Wehrenberg
authors.forename: Philippe
authors.initials: P
authors.lastname: Guyot-Sionnest