The Transient Localization Scenario for Charge Transport in Crystalline Organic Materials

被引:311
作者
Fratini, Simone [1 ,2 ]
Mayou, Didier [1 ,2 ]
Ciuchi, Sergio [3 ,4 ]
机构
[1] CNRS, Inst Neel, F-38042 Grenoble, France
[2] Univ Grenoble Alpes, F-38042 Grenoble, France
[3] Univ Aquila, Dept Phys & Chem Sci, Via Vetoio, I-67100 Laquila, Italy
[4] Univ Aquila, Dept Phys & Chem Sci, CNR ISC, Via Taurini, I-00185 Rome, Italy
关键词
SU-SCHRIEFFER-HEEGER; MEAN-FREE-PATH; HOPPING CONDUCTIVITY; MOLECULAR-CRYSTALS; ELECTRON LOCALIZATION; WEAK-LOCALIZATION; SINGLE-CRYSTALS; ENERGY-TRANSFER; POLARON MOTION; MOBILITY;
D O I
10.1002/adfm.201502386
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Charge transport in crystalline organic semiconductors is intrinsically limited by the presence of large thermal molecular motions, which are a direct consequence of the weak van der Waals intermolecular interactions. These lead to an original regime of transport called transient localization, sharing features of both localized and itinerant electron systems. After a brief review of experimental observations that pose a challenge to the theory, we concentrate on a commonly studied model which describes the interaction of the charge carriers with intermolecular vibrations. We present different theoretical approaches that have been applied to the problem in the past, and then turn to more modern approaches that are able to capture the key microscopic phenomenon at the origin of the puzzling experimental observations, i.e., the quantum localization of the electronic wavefunction at timescales shorter than the typical molecular motions. We describe in particular a relaxation time approximation which clarifi es how the transient localization due to dynamical molecular motions relates to the Anderson localization realized for static disorder, and allows us to devise strategies to improve the mobility of actual compounds. The relevance of the transient localization scenario to other classes of systems is briefl y discussed.
引用
收藏
页码:2292 / 2315
页数:24
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