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

Jihua Chen; Chee Keong Tee; Max Shtein; David C. Martin; John Anthony

doi:10.1016/j.orgel.2009.03.007

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

Jihua Chen, Chee Keong Tee, Max Shtein, David C. Martin, John Anthony

Research output: Contribution to journal › Article › peer-review

104 Scopus citations

Abstract

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 π-π 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 over(2, -) 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.

Original language	English
Pages (from-to)	696-703
Number of pages	8
Journal	Organic Electronics
Volume	10
Issue number	4
DOIs	https://doi.org/10.1016/j.orgel.2009.03.007
State	Published - Jul 2009
Externally published	Yes

Funding

The authors thank the Office of Naval Research and the National Science Foundation for financial supports (DMR-0084304 and DMR-6518079). TEM studies and electrical characterizations were conducted in the Electron Microbeam Analysis Laboratory and Solid State Electronics Laboratory at the University of Michigan at Ann Arbor.

Funders	Funder number
National Science Foundation	DMR-6518079, DMR-0084304
Office of Naval Research

Keywords

Charge-transport anisotropy
Controlled solution process
Functionalized pentacene
Twin boundary

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10.1016/j.orgel.2009.03.007

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

abstract = "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 π-π 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 over(2, -) 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.",

keywords = "Charge-transport anisotropy, Controlled solution process, Functionalized pentacene, Twin boundary",

author = "Jihua Chen and Tee, {Chee Keong} and Max Shtein and Martin, {David C.} and John Anthony",

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AU - Chen, Jihua

AU - Tee, Chee Keong

AU - Shtein, Max

AU - Martin, David C.

AU - Anthony, John

PY - 2009/7

Y1 - 2009/7

N2 - 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 π-π 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 over(2, -) 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.

AB - 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 π-π 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 over(2, -) 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.

KW - Charge-transport anisotropy

KW - Controlled solution process

KW - Functionalized pentacene

KW - Twin boundary

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DO - 10.1016/j.orgel.2009.03.007

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SN - 1566-1199

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JO - Organic Electronics

JF - Organic Electronics

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ER -

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

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