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15 May 2018 Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film
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Ambipolar carrier mobility in a thin film of hexyl-substituted phthalocyanine (C6PcH2), which is a promising donor material for solution-processed organic thin-film solar cells, has been studied by measuring photogenerated charge carriers extracted under a linearly increasing voltage. As the extraction transient current of the C6PcH2 thin film could not be observed in a conventional device structure composed of a single organic layer, an evaporated layer of C60 or pentacene was introduced as a charge-separation layer to determine the hole or electron mobility, respectively. An extraction transient current clearly appeared owing to the efficient photo-induced charge generation at the interface between the C6PcH2 and charge-separation layers. The hole and electron mobilities were evaluated by a proposed analytical model, which took into account the carrier generation at the interface and the carrier diffusion during the delay time.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) 1947-7988/2018/$25.00 © 2018 SPIE
Yuki Nishikawa, Yuya Nakata, Shigehiro Ikehara, Akihiko Fujii, and Masanori Ozaki "Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film," Journal of Photonics for Energy 8(3), 032214 (15 May 2018).
Received: 20 February 2018; Accepted: 25 April 2018; Published: 15 May 2018

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