Organic thin films with charge-carrier mobility exceeding that of single crystals

Zachary A. Lamport, Ruipeng Li, Chao Wang, William Mitchell, David Sparrowe, Detlef M. Smilgies, Cynthia Day, Veaceslav Coropceanu, Oana D. Jurchescu

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The performance of organic field-effect transistors (OFETs) depends heavily upon the intrinsic properties and microstructure of the semiconducting layer, the processes taking place at the semiconductor/dielectric interface, and the quality of contacts. In this article, we report on 7,14-bis(trimethylsilylethynyl) benzo[k]tetraphene single crystal and thin-film OFETs and compare their properties. We find that the single crystals exhibit a pronounced anisotropy in electrical characteristics, with a maximum field-effect mobility of 0.3 cm2 V-1 s-1. Through density functional theory (DFT) calculations we identified the main direction for hole transport, which was confirmed by X-ray diffraction (XRD) measurements as parallel to the plane of the single crystal facet where the transport was probed. By processing the material as a thin-film semiconductor, the content of high-mobility direction probed within the transistor channel was enhanced. The control of film morphology, coupled with a different design of the device structure allowed us to obtain an order of magnitude higher charge-carrier mobilities and a very small spread in device performance.

Original languageEnglish (US)
Pages (from-to)10313-10319
Number of pages7
JournalJournal of Materials Chemistry C
Volume5
Issue number39
DOIs
StatePublished - 2017
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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