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Improving open-circuit voltage by a chlorinated polymer donor endows binary organic solar cells efficiencies over 17% |
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| Authors: | Ma Ruijie Liu Tao Luo Zhenghui Guo Qing Xiao Yiqun Chen Yuzhong Li Xiaojun Luo Siwei Lu Xinhui Zhang Maojie Li Yongfang Yan He |
| Institution: | 1.Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China ;2.Hong Kong University of Science and Technology-Shenzhen Research Institute, Shenzhen, 518057, China ;3.Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China ;4.Department of Physics, Chinese University of Hong Kong, New Territories, Hong Kong, China ; |
| Abstract: | Power conversion efficiency(PCE) of single-junction polymer solar cells(PSCs) has made a remarkable breakthrough recently.Plenty of work was reported to achieve PCEs higher than 16% derived from the PM6:Y6 binary system.To further increase the PCEs of binary OSCs incorporating small molecular acceptor(SMA) Y6,we substituted PM6 with PM7 due to the deeper highest occupied molecular orbital(HOMO) of PM7.Consequently,the PM7:Y6 has achieved PCEs as high as 17.0% by the hotcast method,due to the improved open-circuit voltage(V_(OC)).Compared with PM6,the lower HOMO of PM7 increases the gap between E_(LUMO-donor) and E_(HOMO-acceptor),which is proportional to V_(OC).This research provides a high PCE for single-junction binary PSCs,which is meaningful for device fabrication related to PM7 and commercialization of PSCs. |
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