Inhibiting interfacial transport loss for efficient organic nonfullerene solar cells and photodetectors  

作　　者：Jijiao Huang Bin Li Yuxin Kong Jianyu Yuan 

机构地区：[1]Institute of Functional Nano&Soft Materials(FUNSOM),Soochow University,Suzhou 215123,Jiangsu,China [2]Jiangsu Key Laboratory of Advanced Negative Carbon Technologies,Soochow University,Suzhou 25123,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2024年第12期165-171,共7页能源化学（英文版）

基　　金：financially supported by the National Key Research and Development Program of China (No.2023YFE0210000);the National Natural Science Foundation of China (No. 52261145696, and 52073198);the ‘‘111” project;the Young Elite Scientist Sponsorship Program by CAST;the Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University。

摘　　要：Nonfullerene organic solar cells(OSCs) and photodetectors have received tremendous interest due to their rapidly progressed power conversion efficiency(PCE) and wide range photoresponse to nearinfrared region, respectively. Further optimization of the interfacial transport layer is one of the key factors toward enhanced performance. Herein, we reported a general multi-component electron transport layer(ETL) strategy to achieve better energy level alignments and interfacial contact for both OSCs and photodetectors. The binary polymer:molecule blend based ETL can overcome low crystallinity and selfaggregation issue in neat polymer and molecule ETL, respectively. The mixed blend provides a more tunable platform to optimize the interfacial morphology and creates more efficient charge-transporting pathways. We showcase that the PNDIT-F3N:PDINN binary ETL exhibits its strength in a series of nonfullerene OSCs with enhanced fill factor and current density, achieving a champion PCE approaching 19%. Additionally, self-powered organic photodetectors with lower dark current and high detectivity were achieved with the same binary ETL strategy. Detailed morphology and device characterizations reveal that the binary ETL modulates the interfacial interface to deliver a more favorable energy level alignment, facilitating carrier extraction and transport. We believe these findings could provide insight into the design of ETL with sufficient interfacial tunability for organic optoelectronic devices.

关 键 词：Electron transport layer Organic nonfullerene solar cells Organic photodetectors Charge transfer Fill factor 

分 类 号：TN36[电子电信—物理电子学] TM914.4[电气工程—电力电子与电力传动]