15 May 2018 Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film
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Abstract
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)
Yuki Nishikawa, Yuki Nishikawa, Yuya Nakata, Yuya Nakata, Shigehiro Ikehara, Shigehiro Ikehara, Akihiko Fujii, Akihiko Fujii, Masanori Ozaki, Masanori Ozaki, "Evaluation of ambipolar carrier mobility in alkyl-substituted phthalocyanine thin film," Journal of Photonics for Energy 8(3), 032214 (15 May 2018). https://doi.org/10.1117/1.JPE.8.032214 . Submission: Received: 20 February 2018; Accepted: 25 April 2018
Received: 20 February 2018; Accepted: 25 April 2018; Published: 15 May 2018
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