Improvement of Heterojunction Donor/Acceptor Organic Photovoltaic Devices by Employing Additional Active Layer

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概要

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• Single-heterojunction (HJ) donor/acceptor photovoltaic devices composed of copper phtalocyanine (CuPc) and 3,4,9,10-perylenetetracarboxylic bis-benzimidazole (PTCBI) sandwiched between indium–tin–oxide (ITO) and Ag top electrode were investigated. An improvement in device performance was obtained by inserting another perylene derivative, 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) between the CuPc and the PTCBI layers. In this case, the PTCDI and the PTCBI act as an active layer and a buffer, respectively. The active layer increased the absorption efficiency of incident photons, while the buffer provided an ohmic contact with the Ag top electrode. The power conversion efficiency (PCE) was improved from 0.81% for the reference device (without a PTCDI layer) to 1.13% for the optimized single-HJ device (with a PTCDI layer). The concept found in the single-HJ device was introduced into the stacked tandem triple-HJ devices. The improvement of power conversion efficiency, however, was achieved by inserting the PTCDI layer between the PTCBI and the top electrode.

• 2005-04-15

著者

• Fujita Katsuhiko

  Department Of Applied Science For Electronics And Material Chemistry Interdisciplinary Graduate Scho

• Tsutsui Tetsuo

  Department Of Applied Science For Electronic And Materials Graduate School Of Engineering Sciences K

• Yasuda Takeshi

  Department Of Agricultural Chemistry Kyoto University

• Triyana Kuwat

  Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan

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