Alloy-like ternary polymer solar cells with over 17.2% efficiency  

效率超过17.2%类合金模型的三元聚合物太阳能电池

作　　者：Qiaoshi An Jian Wang Wei Gao Xiaoling Ma Zhenghao Hu Jinhua Gao Chunyu Xu Minghui Hao Xiaoli Zhang Chuluo Yang Fujun Zhang 安桥石;王健;高威;马晓玲;胡拯豪;高进华;徐春雨;郝明辉;张晓俐;杨楚罗;张福俊(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China;College of Physics and Electronic Engineering,Taishan University,Taian 271021,China;Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China;Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials,Department of Chemistry,Wuhan University,Wuhan 400072,China;State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Science,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China [2]College of Physics and Electronic Engineering,Taishan University,Taian 271021,China [3]Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China [4]Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials,Department of Chemistry,Wuhan University,Wuhan 400072,China [5]State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [6]School of Science,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Science Bulletin》2020年第7期538-545,M0003,共9页科学通报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(61805009,61675017,61975006);China Postdoctoral Science Foundation(2018M641170);Beijing Natural Science Foundation(4192049);The authors gratefully acknowledge the assistance of the Shanghai Synchrotron Radiation Facility(beamline BL16B1)for GWAIXS and GISAXS measurements.

摘　　要：Ternary strategy has been considered as an efficient method to achieve high performance polymer solar cells(PSCs). A power conversion efficiency(PCE) of 17.22% is achieved in the optimized ternary PSCs with10 wt% MF1 in acceptors. The over 8% PCE improvement by employing ternary strategy is attributed to the simultaneously increased JSCof 25.68 mA cm^-2, VOCof 0.853 V and FF of 78.61% compared with Y6 based binary PSCs. The good compatibility of MF1 and Y6 can be confirmed from Raman mapping, contact angle,cyclic voltammetry and morphology, which is the prerequisite to form alloy-like state. Electron mobility in ternary active layers strongly depends on MF1 content in acceptors due to the different lowest unoccupied molecular orbital(LUMO) levels of Y6 and MF1, which can well explain the wave-like varied FF of ternary PSCs. The third-party certified PCE of 16.8% should be one of the highest values for single bulk heterojunction PSCs. This work provides sufficient references for selecting materials to achieve efficient ternary PSCs.本文报道了一系列基于PM6:MF1:Y6体系的双受体三元聚合物太阳能电池,其光电转换效率达到17.22%,在中国计量科学研究院的认证效率为16.8%.该工作系统研究了MF1掺杂比例对器件光伏参数的影响,并澄清三元器件的工作机理.随着MF1掺杂比例的增大,器件的短路电流先升高后降低,开路电压逐渐升高,填充因子先升高后降低再升高.器件短路电流的提高主要归因于有源层光子俘获和形貌的优化.逐渐增大的开路电压表明:MF1和Y6形成了类合金态即分子间激发态能级简并, MF1和Y6良好的兼容性是形成类合金态的前提条件.作者利用Raman mapping,接触角和GIWAXS实验证明MF1和Y6具有较好的兼容性.填充因子的变化主要归因于双受体材料较好的兼容性和不同的LUMO能级.当MF1在受体中的比例为50 wt%时,器件中会形成大量的电子陷阱,导致器件的电子迁移率和填充因子的降低.该工作表明:三元策略是一种提高器件性能的有效方法,有望成为有机光伏器件产业化的首选方案.

关 键 词：Polymer solar cells Ternary strategy Nonfullerene acceptor Alloy-like model 

分 类 号：TM914.4[电气工程—电力电子与电力传动]