Ge Jinfeng, Xie Lin, Peng Ruixiang, Ge Ziyi
Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences, Ningbo, 315201, P. R. China.
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2023 May;35(20):e2206566. doi: 10.1002/adma.202206566. Epub 2023 Mar 27.
The emerging Y-series nonfullerene acceptors (Y-NFA) has prompted the rapid progress of power conversion efficiency (PCE) of all-small-molecule organic solar cells (ASM-OSCs) from around 12% to 17%. The excellent PCE improvement benefits from not only the outstanding properties of Y-series acceptors but also the successful development of small-molecule donors. The short-circuit current density, fill factor, and nonradiative recombination are all optimized to the unprecedented values, providing a scenery that is obviously different from the ITIC-series based ASM-OSCs. In this review, OSCs utilizing small-molecule donors and Y-NFA are summarized and classified in order to provide an up-to-date development overview and give an insight on structure-property correlation. Then, the characteristics of bulk-heterojunction (BHJ) formation of ASM-OSCs are discussed and compared with that of polymer-based OSCs. Finally, the challenges and outlook on designing ground-breaking small-molecule donor and forming an ideal BHJ morphology are discussed.
新兴的Y系列非富勒烯受体（Y-NFA）推动了全小分子有机太阳能电池（ASM-OSC）的功率转换效率（PCE）从约12%迅速提高到17%。PCE的出色提升不仅得益于Y系列受体的优异性能，还得益于小分子供体的成功开发。短路电流密度、填充因子和非辐射复合都被优化到了前所未有的值，呈现出与基于ITIC系列的ASM-OSC明显不同的景象。在这篇综述中，对利用小分子供体和Y-NFA的有机太阳能电池进行了总结和分类，以便提供最新的发展概况，并深入了解结构-性能的相关性。然后，讨论了ASM-OSC的本体异质结（BHJ）形成特性，并与基于聚合物的有机太阳能电池进行了比较。最后，讨论了设计开创性小分子供体和形成理想BHJ形态方面的挑战与展望。
