Acceptor-rich bulk heterojunction polymer solar cells with balanced charge mobilities |
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| Affiliation: | 1. CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;2. Institute of Material Science and Engineering, Ocean University of China, Qingdao 266100, China;1. College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan 411105, China;2. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;3. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510000, China;1. Department of Industrial Chemistry, Pukyong National University, 48547, Pusan, Republic of Korea;2. Department of Polymer Engineering, Pukyong National University, 48547, Pusan, Republic of Korea;3. Linz Institute for Organic Solar Cells (LIOS)/Institute of Physical Chemistry, Johannes Kepler University Linz, 4040, Linz, Austria;1. College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;2. Jiangxi Provincial Key Laboratory of New Energy Chemistry/Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;3. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an 710049, China;4. Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), 2 Zhongguancun Beiyi Street, Beijing 100190, China;1. POSTECH Organic Electronics Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea;2. Department of Chemistry & ERI, Gyeongsang National University, Jin-ju, 660-701, Republic of Korea;3. School of Materials Science & Engineering and Research Institute for Green Energy Convergence Technology (REGET), Gyeongsang National University, Republic of Korea;1. Institute of Materials Science and Engineering, Ocean University of China, Qingdao, Shandong 266100, China.;2. CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, China;1. Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan;2. Advanced Institute of Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan;3. Department of Computer Science, Tokyo University of Technology, 1404-1 Katakuramachi Hachioji, Tokyo, 192-0914, Japan |
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| Abstract: | In this work, we reported efficient polymer solar cells with balanced hole/electron mobilities tuned by the acceptor content in bulk heterojunction blend films. The photovoltaic cells were fabricated with two new wide band-gap D-A polymers PBDDIDT and PBDDIDTT as the donor material. The molecular conformations of new polymers are carefully evaluated by theoretical calculations. The results of photovoltaic studies show that two devices reach their optimal conditions with rich PC71BM content up to 80% in blend films, which is uncommon with most of reported PSCs. The as-cast devices based on PBDDIDT and PBDDIDTT reveal good photovoltaic performance with PCE of 7.04% and 6.40%, respectively. The influence of PC71BM content on photovoltaic properties is further detailed studied by photoluminescence emission spectra, charge mobilities and heterojunction morphology. The results exhibit that more efficient charge transport between donor and acceptor occurs in rich PC71BM blend films. Meanwhile, the hole and electron mobilities are simultaneously enhanced and afford a good balance in rich PC71BM blend films (D/A, 1:4) which is critical for the improvement of current density and fill factors. |
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| Keywords: | Wide band-gap Acceptor-rich blend Polymer solar cells Balanced charge mobilities |
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