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| 1 | Tuning the Molecular Weight of Chlorine-Substituted Polymer Donors for Small Energy Loss显示文摘The molecular weight of polymers plays a major role in their aggregation and miscibility in active layer,which eventually dominate the energy loss and device performance.A series of chlorine-substituted PBD-CI polymers with controlled molecular weight have been synthesized as templates to discern a relationship between molecular weight and the optical properties,energy levels,morphologies,energy loss and photovoltaic performance.Although it has similar optical and electrochemical properties,when blended with acceptor N3,the low molecular weight polymer PBD-CI_(L) gives the biggest energy loss value,and a PCE of 12.06%.PBD-CI_(H) shows a moderate energy loss,but displays the lowest PCE of 9.00%as a result of excessive aggregation.PBD-CI_(M) with a medium molecular weight gives the smallest energy loss and achieves a PCE of 17.17%,which is among one of the highest values recorded to date for the C卜substituted polymer solar cells.Moreover,the molecular weight mainly affects the nonradiative energy loss(△E_(3)), PBD-CI_(M) also shows the smallest value of 0.252 eV among three polymer donors.These results show the effect of controlling the molecular weight to achieve a small energy loss and provide guidelines which can lead to an understanding of the real photovoltaic performance of new materials. | Tingxing Zhao Huan Wang Mingrui Pu Hanjian Lai Hui Chen Yulin Zhu Nan Zheng Feng He | 2021 | Chinese Journal of Chemistry2021，39，6： | 0 |
| 2 | Tuning Aggregation Behavior of Polymer Donor via Molecular-Weight Control for Achieving 17.1%Efficiency Inverted Polymer Solar Cells显示文摘Main observation and conclusion Recently,the polymer solar cells(PSCs)based on the PM6 and small molecular acceptor(SMA)Y6 have attracted considerable attention in this community for their outstanding photovoltaic performance. | Qi Liu Jin Fang Jingnan Wu Lei Zhu Xia Guo Feng Liu Maojie Zhang | 2021 | Chinese Journal of Chemistry2021，39，7： | 0 |
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