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Issue 39, 2017
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Organic thin films with charge-carrier mobility exceeding that of single crystals

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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.

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

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Publication details

The article was received on 24 Jul 2017, accepted on 22 Sep 2017 and first published on 25 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC03324A
Citation: J. Mater. Chem. C, 2017,5, 10313-10319
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    Organic thin films with charge-carrier mobility exceeding that of single crystals

    Z. A. Lamport, R. Li, C. Wang, W. Mitchell, D. Sparrowe, Detlef-M. Smilgies, C. Day, V. Coropceanu and O. D. Jurchescu, J. Mater. Chem. C, 2017, 5, 10313
    DOI: 10.1039/C7TC03324A

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