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Issue 5, 2012
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A flexible n-type organic semiconductor for optoelectronics

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n-Type organic semiconductors are important for a range of optoelectronic applications including organic photovoltaic devices, light-emitting diodes, and field effect transistors (FETs). In spite of this clear motivation there has been significantly less development of n-type compounds relative to p-type systems. We have developed a simple, small molecule n-type material, 2-[(7-{9,9-di-n-propyl-9H-fluoren-2-yl}benzo[c][1,2,5]thiadiazol-4-yl)methylene]malononitrile (K12), that can be processed either by spin-coating from solution or evaporation in vacuum. The thermal properties of K12 enable the film morphology to be controlled at easily accessible temperatures allowing the charge mobility to be tuned over two orders of magnitude. The electron mobility in the films was found to be independent of the initial processing conditions (solution or evaporation). The electron mobility measured in a FET configuration was of the order of 10−3 cm2 V−1 s−1 for films prepared via either processing method whilst Photoinduced Charge Extraction in Linearly Increasing Voltage (PhotoCELIV) gave a mobility of order 10−4 cm2 V−1 s−1.

Graphical abstract: A flexible n-type organic semiconductor for optoelectronics

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The article was received on 22 Aug 2011, accepted on 15 Nov 2011 and first published on 05 Dec 2011

Article type: Paper
DOI: 10.1039/C1JM14089B
Citation: J. Mater. Chem., 2012,22, 1800-1806
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    A flexible n-type organic semiconductor for optoelectronics

    K. Gui, K. Mutkins, P. E. Schwenn, K. B. Krueger, A. Pivrikas, P. Wolfer, N. Stingelin Stutzmann, P. L. Burn and P. Meredith, J. Mater. Chem., 2012, 22, 1800
    DOI: 10.1039/C1JM14089B

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