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《Acta Polymerica Sinica》 2018-02
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New Perylenediimide Polymer Acceptor Design and Their Applications to All-polymer Solar Cells

Yi-kun Guo;Da-hui Zhao;College of Chemistry and Molecular Engineering,Peking University;  
Bulk-heterojunction(BHJ) polymer solar cells(PSCs) have attracted attention over the past decades due to their distinct advantages of low cost,light weight,and the suitability for flexible-device fabrications.Despite the remarkable success in improving the efficiency of PSCs,fullerene-based acceptors have shown evident limitations.Accordingly,increased research efforts have been invested in developing non-fullerene acceptors,and great development has been witnessed in this field in recent years.Among all different kinds of BHJ PSCs,all polymer solar cells(all-PSCs) potentially possess the most stable donor-acceptor phase separation morphology,and all-polymer films are expected to boast superior mechanical properties.Yet,the bottle neck of enhancing the power conversion efficiency(PCE) of all-PSCs currently lies in the performance of the polymer acceptors.In the past years,we have been focusing on designing new polymer acceptors using perylenediimide(PDI) as the main building block and studying their performance in all-PSCs.A series of PDI-based polymer acceptors have been synthesized and studied since 2013.Due to the steric hindrance induced by the bay-region substitution,the PDI polymers mostly manifest low crystallinity.Accordingly,by enhancing the conjugation and rigidity of the polymer backbone,and thereby improving the aggregation and crystallization ability of the polymers,increased PCE has been achieved with all-PSC devices.Consistently,experimental evidence has also been collected showing improved morphology of the active layer.As a result of the continued and systematic studies on designing and synthesizing new polymer acceptors,along with the optimization of device fabrication conditions,the best PCE of all-PSC incorporating a PDI polymer acceptor has now been boosted to 8.59%.Very similar PCE values can be obtained from devices fabricated under ambient conditions,proving the high chemo-stability of the active-layer materials.The synthetic methods of these PDI-based polymers and the device fabrication conditions are much more convenient and economical.All these properties are friendly to the large-scale material preparation and device production.
【Fund】: 国家自然科学基金(基金号21674001)资助项目
【CateGory Index】: TM914.4
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