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Issue 39, 2013
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Characterization and field-effect transistor performance of printed pentacene films prepared by photoconversion of a soluble precursor

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Abstract

6,13-Dihydro-6,13-ethanopentacene-15,16-dione is a soluble precursor of pentacene, which can be converted into pentacene by irradiation in the solid-state. Its photoconversion process in spin-coated films was monitored by UV-visible absorption and IR spectroscopy. A small amount of high-boiling-point additives in the chloroform spin-coating solution promoted photoconversion to obtain high quality films suitable for FETs. The FET mobilities showed a correlation with the additives' boiling points and dissolution abilities, indicating that the retainment of a semidry state during photoconversion is essential to the complete photoconversion. Photoirradiation conditions (irradiation intensity, duration and substrate temperature) were optimized to achieve a field-effect mobility of 0.86 cm2 V−1 s−1, comparable to the performance of vacuum-deposited pentacene films. The prepared films have a partially crystalline morphology different from that of vacuum-deposited films. The high FET mobility of the photoconverted film is attributed to continuously connected grain boundaries arising from partial crystallinity.

Graphical abstract: Characterization and field-effect transistor performance of printed pentacene films prepared by photoconversion of a soluble precursor

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Publication details

The article was received on 07 Jun 2013, accepted on 26 Jul 2013 and first published on 31 Jul 2013


Article type: Paper
DOI: 10.1039/C3TC31083C
Citation: J. Mater. Chem. C, 2013,1, 6244-6251
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    Characterization and field-effect transistor performance of printed pentacene films prepared by photoconversion of a soluble precursor

    K. Nakayama, C. Ohashi, Y. Oikawa, T. Motoyama and H. Yamada, J. Mater. Chem. C, 2013, 1, 6244
    DOI: 10.1039/C3TC31083C

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