Crystallization of Organic Semiconductor Blends in Organic Photovoltaic Cells by Co-evaporant induced Crystallization Method(<Special Issue>Novel Solar Cells Utilizing Nano- and Hetero-Structure)

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  • Kaji Toshihiko
    Institute for Molecular Science, National Institute of Natural Sciences

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  • 有機薄膜太陽電池の有機半導体混合膜の共蒸発分子誘起結晶化法による結晶化(<特集>ナノ・ヘテロ構造を利用した太陽電池)
  • 有機薄膜太陽電池の有機半導体混合膜の共蒸発分子誘起結晶化法による結晶化
  • ユウキ ハクマク タイヨウ デンチ ノ ユウキ ハンドウタイ コンゴウマク ノ キョウ ジョウハツ ブンシ ユウキ ケッショウカホウ ニ ヨル ケッショウカ

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Abstract

A method to crystallize organic semiconductor blends in organic photovoltaic cells is reviewed. This method utilizes a liquid as a non-sticking co-evaporant of small molecular organic semiconductors and crystallizes their single and blend films. Blend films based on H_2Pc and C_<60> with much improved crystallinity have been produced by this method and confirmed by analysis using UV-Vis, XRD and FESEM. Used in organic photovoltaic cells, a variety of blend films, such as blends of fullerene (acceptor) and H_2Pc, PbPc, AlPcCl, and rubrene (donors), have been produced by this method and have achieved striking enhancement of short-circuit current density. In this review, I also present the principle of this new method, co-evaporant induced crystallization. Since it drastically improve the principle of vacuum deposition of organic semiconductors, this method would not be limited for organic photovoltaic cells but also useful for other organic devices.

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