Anisotropic charge transport in organic single crystals based on dipolar molecules

被引：18

作者：

Fraboni, B. ^{[1
]}

DiPietro, R. ^{[1
]}

Castaldini, A. ^{[1
]}

Cavallini, A. ^{[1
]}

Fraleoni-Morgera, A. ^{[2
]}

Setti, L. ^{[2
]}

Mencarelli, I. ^{[2
]}

Femoni, C. ^{[3
]}

机构：

[1] CNISM, Dept Phys, I-40127 Bologna, Italy

[2] Univ Bologna, Dept Ind & Mat Chem, I-40127 Bologna, Italy

[3] Univ Bologna, Dept Phys & Inorgan Chem, I-40127 Bologna, Italy

来源：

ORGANIC ELECTRONICS | 2008年 / 9卷 / 06期

关键词：

Organic semiconductors; Single crystals; Deep traps; Anisotropic transport;

D O I：

10.1016/j.orgel.2008.07.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We studied the anisotropic charge transport properties of solution-grown organic single crystals based on a dipolar molecule (4-hydroxy-cyanobenzene) by field effect devices and by spectral photocurrent analyses. Optical excitation differently affects the flow of charge carriers along the two main planar crystal axes, altering the charge transport anisotropy induced by the molecular pi-orbitals stacking. We attribute this behaviour to the presence of an intrinsic molecular dipole and to its different orientation within the crystal lattice and we advance a hypothesis on the nature of the observed band of deep trapping states. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：974 / 978

页数：5

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