A-π-D-π-A small-molecule donors with different end alkyl chains obtain different morphologies in organic solar cells |
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Authors: | Yanan Shi Chen Yang Huan Li Lixuan Liu Ruimin Zhou Wenjun Zou Zhen Wang Qiong Wu Dan Deng Jianqi Zhang Kun Lu Zhixiang Wei |
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Institution: | CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China cSino-Danish College, University of Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | For bulk-heterojunction organic solar cells, the morphology of the blend films highly influence the exciton dissociation and charge transport process. In this work, two novel A-π-D-π-A (A represents the acceptor unit and D represents the donor unit) backbone structure small molecular electron donors based on two dimensional conjugated naphtho1,2-b:5,6-b']dithiophene (NDT) with different end alkyl chains, named as NDT-3T-EH and NDT-3T-O, have been designed and synthesized. The photovoltaic property of NDT-3T-O-based device is better than that of the NDT-3T-EH and the best efficiency reaches 7.06%, and the photovoltaic property of NDT-3T-EH reaches 6.11%. The difference in the performance should be attributed to the different morphology and phase separation resulted from the different crystallinity and aggregation ability of two donors. The results demonstrate that the optimized end alkyl chains can be used to design A-π-D-π-A backbone structure small molecular electron donors for smallmolecule organic solar cells. |
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Keywords: | Organic solar cells All-small-molecule A-π-D-π-A small molecular donor End alkyl chain Morphology of active layer |
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