Freezing-in orientational disorder induces crossover from thermally-activated to temperature-independent transport in organic semiconductors

K. P. Goetz, A. Fonari, D. Vermeulen, P. Hu, H. Jiang, P. J. Diemer, J. W. Ward, M. E. Payne, C. S. Day, C. Kloc, V. Coropceanu (), L. E. McNeil and O. D. Jurchescu ()
Additional contact information
K. P. Goetz: Wake Forest University
A. Fonari: School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology
D. Vermeulen: University of North Carolina at Chapel Hill
P. Hu: School of Materials Science and Engineering, Nanyang Technological University
H. Jiang: School of Materials Science and Engineering, Nanyang Technological University
P. J. Diemer: Wake Forest University
J. W. Ward: Wake Forest University
M. E. Payne: Wake Forest University
C. S. Day: Wake Forest University
C. Kloc: School of Materials Science and Engineering, Nanyang Technological University
V. Coropceanu: School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology
L. E. McNeil: University of North Carolina at Chapel Hill
O. D. Jurchescu: Wake Forest University

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The crystalline structure of organic materials dictates their physical properties, but while significant research effort is geared towards understanding structure–property relationships in such materials, the details remain unclear. Many organic crystals exhibit transitions in their electrical properties as a function of temperature. One example is the 1:1 charge-transfer complex trans-stilbene—2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane. Here we show that the mobility and resistivity of this material undergo a transition from being thermally activated at temperatures above 235 K to being temperature independent at low temperatures. On the basis of our experimental and theoretical results, we attribute this behaviour to the presence of a glass-like transition and the accompanied freezing-in of orientational disorder of the stilbene molecule.

Date: 2014
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DOI: 10.1038/ncomms6642

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