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Nat Commun. 2014 Dec 3;5:5642. doi: 10.1038/ncomms6642.

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

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Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109, USA.
School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Department of Chemistry, Wake Forest University, Winston-Salem, North Carolina 27109, USA.


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.


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