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

被引：43

作者：

Goetz, K. P. ^{[1
]}

Fonari, A. ^{[2
,3
]}

Vermeulen, D. ^{[4
]}

Hu, P. ^{[5
]}

Jiang, H. ^{[5
]}

Diemer, P. J. ^{[1
]}

Ward, J. W. ^{[1
]}

Payne, M. E. ^{[1
]}

Day, C. S. ^{[6
]}

Kloc, C. ^{[5
]}

Coropceanu, V. ^{[2
,3
]}

McNeil, L. E. ^{[4
]}

Jurchescu, O. D. ^{[1
]}

机构：

[1] Wake Forest Univ, Dept Phys, Winston Salem, NC 27109 USA

[2] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

[3] Georgia Inst Technol, Ctr Organ Photon & Elect, Atlanta, GA 30332 USA

[4] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[5] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[6] Wake Forest Univ, Dept Chem, Winston Salem, NC 27109 USA

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

CHARGE-TRANSFER COMPLEXES; FIELD-EFFECT TRANSISTORS; NEUTRAL-IONIC TRANSITION; GLASS-TRANSITION; TTF-TCNQ; INTRAMOLECULAR MOTION; TRANSFER INTERFACES; MOLECULAR-CRYSTALS; BEDT-TTF; ACCEPTOR;

D O I：

10.1038/ncomms6642

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：8

共 68 条

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