Intrinsically inert hyperbranched interlayer for enhanced stability of organic solar cells
유기 태양 전지의 안정성 향상을 위한 본질적으로 불활성인 하이퍼브랜치 중간층
Capa intermedia hiperramificada intrínsecamente inerte para mejorar la estabilidad de las células solares orgánicas
Intercalaire hyperramifié intrinsèquement inerte pour une stabilité accrue des cellules solaires organiques
Внутренне инертный сверхразветвленный промежуточный слой для повышения стабильности органических солнечных элементов
Yawen Li ¹ ², Tengfei Li 李腾飞 ¹, Jiayu Wang 王嘉宇 ³, Xiaowei Zhan 占肖卫 ³, Yuze Lin 林禹泽 ¹ ²
¹ Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China
中国 北京 中国科学院化学研究所 有机固体重点实验室 北京分子科学国家实验室
² University of Chinese Academy of Sciences, Beijing 100049, China
中国 北京 中国科学院大学
³ School of Materials Science and Engineering, Peking University, Beijing 100871, China
中国 北京 北京大学材料科学与工程学院
Science Bulletin, 21 September 2021

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 destabilizes the device. 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.
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