Anisotropic Ambipolar Carrier Transport and High Bipolar Mobilities up to 0.1 cm2V-1s-1 in Aligned Liquid-Crystal Glass Films of Oligofluorene
Journal
Applied Physics Letters
Journal Volume
91
Journal Issue
16
Pages
163509
Date Issued
2007-01
Author(s)
Abstract
By taking advantage of the rich morphological characteristics of oligofluorenes and the mesophase-mediated molecular assembly/alignment, we studied carrier-transport properties of solid-state oligofluorenes in different morphologies and orientations. Compared to the amorphous phase, the uniaxially aligned liquid-crystal glass of oligofluorenes could give up to 100-fold enhancement in bipolar carrier-transport mobilities, bringing both hole and electron mobilities to nearly 0.1 cm2 V s. Furthermore, significant anisotropic bipolar transport, i.e., preferential bipolar carrier transport along the oligomer chain direction is observed. © 2007 American Institute of Physics.
Other Subjects
Anisotropy; Electron mobility; Glass; Liquid crystal displays; Solid state device structures; Thin films; High bipolar mobilities; Liquid-crystal glass films; Mesophase-mediated molecular assembly; Oligofluorene; Carrier transport
Type
journal article