摘要
Device stability becomes one of the most crucial issues for the commercialization of organic solar cells(OSCs) after high power conversion efficiencies have been achieved. Besides the intrinsic stability of photoactive materials, the chemical/catalytic reaction between interfacial materials and photoactive materials is another critical factor that determines the stability of OSC devices. Herein, we design and synthesize a reaction-inert rylene diimide-embedded hyperbranched polymer named as PDIEIE, which effectively reduces the work function of indium tin oxide electrode from 4.62 to 3.65 eV. Meanwhile, PDIEIE shows negligible chemical reaction with high-performance photoactive materials and no catalytic effect under strong ultraviolet illumination, resulting in much better photo-stability of OSCs with PDIEIE cathode interlayer(CIL), relative to the traditional CILs, including most-widely used metal oxides and polyethyleneimine derivatives.
较差的稳定性是限制有机太阳能电池产业化的主要因素之一.传统阴极界面对稠环电子受体具有严重的化学反应活性或光催化活性,限制了高效有机太阳能电池稳定性的提升.本文使用苝四甲酸二酐对乙氧基化聚乙烯亚胺(PEIE)的残留伯氨基端基封端,得到具有超支化结构的聚合物阴极界面材料PDIEIE.该超支化界面修饰氧化铟锡透明电极后,能有效降低电极功函数,实现器件较高的光电转化效率.更重要的是, PDIEIE作为阴极界面材料,相对于金属氧化物界面材料对稠环电子受体没有光催化活性,其相对于PEIE表现出显著抑制的化学反应活性,因此有效提升了有机太阳能电池的稳定性,并保持了器件较高的光电转化效率.
作者
Yawen Li
Tengfei Li
Jiayu Wang
Xiaowei Zhan
Yuze Lin
荔雅文;李腾飞;王嘉宇;占肖卫;林禹泽(Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Materials Science and Engineering,Peking University,Beijing 100871,China)
基金
supported by the National Natural Science Foundation of China(52173189 and 22105208)。
