Enhancing the performance of porphyrin based solar cells by the Bipy coordination |
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Authors: | Lisheng Li Yuying HuangJunbiao Peng Yong CaoXiaobin Peng |
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Affiliation: | Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China |
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Abstract: | Solution processed organic solar cells (OSCs) often suffer from low charge mobilities partially due to the disordered non-crystalline or amorphous morphology of their films. In this study, 4,4′-bipyridyl (Bipy) is introduced to coordinate a zinc(II) porphyrin to form porphyrin complexes. A significant enhanced hole mobility and solar cell device performance are attained when the ratio of Bipy is 0.25 in blend films with [6, 6]-phenyl C61-butyric acid methyl ester (PC61BM). When [6, 6]-phenyl C71-butyric acid methyl ester (PC71BM) was used instead of PC61BM, the PCE is enhanced to 2.83% in the presence of 0.25 equiv Bipy, which is an increase of 53% compared to that without Bipy. |
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Keywords: | Heterojunction solar cells Small molecule Self-assembly Additive |
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