Controlled solution deposition and systematic study of charge-transport anisotropy in single crystal and single-crystal textured TIPS pentacene thin films

被引：103

作者：

Chen, Jihua ^{[1
]}

Tee, Chee Keong ^{[2
]}

Shtein, Max ^{[1
,3
]}

Martin, David C. ^{[1
,3
,4
]}

Anthony, John ^{[5
]}

机构：

[1] Univ Michigan, Ctr Macromol Sci & Engn, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Elect Engn & Comp Sci, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[4] Univ Michigan, Dept Biomed Engn, Ann Arbor, MI 48109 USA

[5] Univ Kentucky, Dept Chem, Lexington, KY 40506 USA

来源：

ORGANIC ELECTRONICS | 2009年 / 10卷 / 04期

基金：

美国国家科学基金会;

关键词：

Functionalized pentacene; Controlled solution process; Charge-transport anisotropy; Twin boundary; MOLECULAR-ORIENTATION; TRANSISTOR;

D O I：

10.1016/j.orgel.2009.03.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, bis-(triisopropylsilylethynyl) pentacene (TIPS pentacene) films were fabricated with a newly designed system for controlled solution casting with adjustable nitrogen flow and deposition temperature, which consequently enabled a systematic examination of crystal orientation-dependent mobilities in single crystal and single-crystal textured TIPS pentacene transistors. One of the two pi-pi stacking directions in TIPS pentacene films was found to be close to [2 1 0] (or the long axis of needle-shaped TIPS pentacene films), with frequent twinning observed between crystalline domains across the (1 (2) over bar 0) planes that are the lateral facets for individual crystallites. The [2 1 0] axes of crystalline TIPS pentacene thin films ran across source-drain channels at different angles, showing a ten-fold hole mobility increase as the [2 1 0] crystallographic axis became parallel to the channel direction. Our results also suggest that the controlled solution casting may be a promising method in fabricating solution-processible small-molecule organic semiconductors with varied morphologies. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：696 / 703

页数：8

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