Ma Ruijie, Li Hongxiang, Dela Peña Top Archie, Xie Xiyun, Fong Patrick Wai-Keung, Wei Qi, Yan Cenqi, Wu Jiaying, Cheng Pei, Li Mingjie, Li Gang
Department of Electrical and Electronic Engineering, Research Institute for Smart Energy (RISE), Guangdong-Hong Kong-Macao (GHM) Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, Kowloon, 999077, China.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China.
Adv Mater. 2024 Apr;36(15):e2304632. doi: 10.1002/adma.202304632. Epub 2024 Jan 18.
Using two structurally similar polymer acceptors in constructing high-efficiency ternary all-polymer solar cells is a widely acknowledged strategy; however, the focus thus far has not been on how polymer acceptor(s) would tune the aggregation of polymer donors, and furthermore film morphology and device performance (efficiency and stability). Herein, it is reported that matching of the celebrity acceptor PY-IT and the donor PBQx-TCl results in enhanced H-aggregation in PBQx-TCl, which can be finely tuned by controlling the amount of the second acceptor PY-IV. Consequently, the efficiency-optimized PY-IV weight ratio (0.2/1.2) leads to a state-of-the-art power conversion efficiency of 18.81%, wherein light-illuminated operational stability is also enhanced along with well-protected thermal stability. Such enhancements in the efficiency and operational and thermal stabilities of solar cells can be attributed to morphology optimization and the desired glass transition temperature of the target active layer based on comprehensive characterization. In addition to being a high-power conversion efficiency case for all-polymer solar cells, these enhancements are also a successful attempt for using combined acceptors to tune donor aggregation toward optimal morphology, which provides a theoretical basis for the construction of other types of organic photovoltaics beyond all-polymer solar cells.
在构建高效三元全聚合物太阳能电池中使用两种结构相似的聚合物受体是一种广泛认可的策略；然而，迄今为止的重点并非聚合物受体如何调节聚合物供体的聚集，以及薄膜形态和器件性能（效率和稳定性）。在此，据报道，著名受体PY-IT与供体PBQx-TCl的匹配导致PBQx-TCl中H-聚集增强，这可以通过控制第二种受体PY-IV的量进行精细调节。因此，效率优化的PY-IV重量比（0.2/1.2）带来了18.81%的先进功率转换效率，其中光照下的运行稳定性以及良好的热稳定性也得到了增强。基于全面表征，太阳能电池效率、运行稳定性和热稳定性的这种提高可归因于形态优化以及目标活性层所需的玻璃化转变温度。除了是全聚合物太阳能电池的高功率转换效率案例外，这些提高也是使用组合受体调节供体聚集以实现最佳形态的成功尝试，这为构建全聚合物太阳能电池之外的其他类型有机光伏器件提供了理论基础。
