Charge transport in anthradithiophene single crystals

✍ Scribed by J.H. Schön; Ch. Kloc; T. Siegrist; J. Laquindanum; H.E. Katz

• Book ID: 104443236
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 195 KB
• Volume: 2
• Category: Article
• ISSN: 1566-1199
• DOI: 10.1016/s1566-1199(01)00022-2

✦ Synopsis

The intrinsic charge transport mechanism in anthradithiophene single crystals is investigated by temperature dependent space charge limited current spectroscopy. The mobility for in-plane transport in this layered p-type semiconductor exhibits an inverse power law temperature dependence, typical for coherent band-like charge transport. In contrast to that a thermally activated charge transport perpendicular to the molecular planes can be described by incoherent hopping motion. Consequently, the charge carriers (holes) can be characterized as partly delocalized between molecules of a given molecular layer, but localized within individual molecular layers. The results are compared to the related compounds, pentacene and a-sexithiophene, in order to investigate the in¯uence of the sulfur orbitals on hole transport in these and other thiophene-based molecular materials.