Charge transport in vapor deposited molecular glasses

✍ Scribed by P.M. Borsenberger; E.H. Magin; J. Shi

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 594 KB
• Volume: 217
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(95)00627-3

✦ Synopsis

Hole mobilities have been measured in a series of vapor deposited molecular glasses over a wide range of fields and temperatures. The results are described by a theory based on disorder, due to B/issler and coworkers. The theory is based on the assumption that charge transport occurs by hopping through a manifold of localized states with superimposed energetic and positional disorder. A key parameter of the theory is a, the energy width of the hopping site manifold. Values of ~r are in agreement with a model based on dipolar disorder, due to Young. The model assumes that the total width is comprised of a dipolar component and a van der Waals component. These results, in conjunction with literature results for a wide range of donor and acceptor glasses, suggest that the van der Waals component is largely of positional or geometrical origin.