Effects of processing additives on nanoscale phase separation,crystallization and photovoltaic performance of solar cells based on mesogenic phthalocyanine |
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| Authors: | Quang-Duy Dao Tetsuro Hori Kaoru Fukumura Tetsuya Masuda Toshiya Kamikado Akihiko Fujii Yo Shimizu Masanori Ozaki |
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| Affiliation: | 1. Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan;2. Research Institute for Ubiquitous Energy Devices, Kansai Center, National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan |
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| Abstract: | A study on the effects of processing additives on the nanoscale phase separation, crystallization, and photovoltaic performance of bulk heterojunction (BHJ) thin films made of 1,4,8,11,15,18,22,25-octahexylphthalocyanine (C6PcH2) and [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) via spin-casting for photovoltaic applications is reported. By incorporating various solvents as processing additives to a volume of a few percent, the separation of donor and acceptor phases in C6PcH2:PCBM thin films, which discussed by taking the photoluminescence quenching, Davydov splitting at the Q-band of the absorbance spectra and the surface nanomorphology into consideration, is improved, and the crystallinity of the discotic C6PcH2 molecules with hexagonal structures is reinforced. Photovoltaic cells with the optimum phase-separated BHJ materials and high crystallinity of the discotic C6PcH2 molecules are demonstrated to have a power conversion efficiency of 4.2%. |
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| Keywords: | Organic solar cells Thin films Phthalocyanine Bulk heterojunction |
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