物理化学学报2018，Vol.34Issue(11)：1279-1285,7.DOI:10.3866/PKU.WHXB201804098
基于无规三元共聚物的非卤溶液加工型高效聚合物太阳能电池
Wide Bandgap Random Terpolymers for High Efficiency Halogen-Free Solvent Processed Polymer Solar Cells
摘要
Abstract
Over the past two decades,bulk heterojunction polymer solar cells (PSCs) have attracted significant attention owing to their potential applications in the mass fabrication of flexible device panels by roll-to-roll printing.To improve the photovoltaic performance of PSCs,much effort has been devoted to the optimization of properties of donor-acceptor (D-A) type polymer donor materials.Until now,the development of high-performance donor polymers is mainly dependent on the design and synthesis of binary polymers with a regular D/A alternating skeleton.Compared to binary polymers,random terpolymers with three different donor or acceptor monomer units possess synergetic effects of their inherent properties,such as optical absorption ability,energy levels,crystallinity,charge mobility,and morphological compatibility with the n-OS acceptors with suitable adjustment of the molar ratio of the three monomers.However,the irregularity in the polymer backbone of the random terpolymers may have an adverse effect on molecular packing,crystallinity,and charge mobility.Therefore,design and synthesis of high-performance terpolymers for PSCs is a challenging task.In this study,a series of wide bandgap random terpolymers PSBTZ-80,PSBTZ-60,and PSBTZ-40 based on alkylthiothienyl substituted benzodithiophene as the donor unit and two weak electron-deficient acceptor units of 5,6-difluorobenzotriazole (FBTz) and thiazolothiazole (TTz) were designed and synthesized for PSC applications.The optical,electrochemical,molecular packing,and photovoltaic properties of the polymers were effectively modulated by varying the FBTz∶TTz molar ratio.Therefore,the PSC based on PSBTZ-60 as the donor material and narrow bandgap small molecule 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexyl-phenyl)-dithieno[2,3-d∶2',3'-d']-s-indaceno[1,2-b∶5,6-b']di thiophene) (ITIC) as the acceptor,processed using halogen-free solvents,exhibited high power conversion efficiency (PCE) of 10.3％ with high open-circuit voltage (Voc) of 0.91 V,improved short-circuit current density (Jsc) of 18.0 mA·cm-2,and fill factor (FF) of 62.7％,which are superior to those of PSCs based on binary polymers PSBZ (a PCE of 8.1％,Voc of 0.89 V,Jsc of 14.7 mA·cm-2,and FF of 61.5％) and PSTZ (a PCE of 8.5％,Voc of 0.96 V,Jsc of 14.9 mA·cm-2,and FF of 59.1％).These results indicate that random terpolymerization is a simple and practical strategy for the development of high-performance polymer photovoltaic materials.关键词
三元共聚物/聚合物太阳能电池/非卤溶剂/能量转化效率Key words
Terpolymer/Polymer solar cells/Halogen-free solvent/Power conversion efficiency分类
化学化工引用本文复制引用
国霞,凡群平,崔超华,张志国,张茂杰..基于无规三元共聚物的非卤溶液加工型高效聚合物太阳能电池[J].物理化学学报,2018,34(11):1279-1285,7.基金项目
国家自然科学基金(51573120,51503135,51773142,91633301)和江苏省自然科学基金(BK20150332)资助项目 The project was supported by the National Natural Science Foundation of China (51573120,51503135,51773142,91633301),and Jiangsu Provincial Natural Science Foundation,China (BK20150332). （51573120,51503135,51773142,91633301）
