Simple-Structured Acceptor with Highly Interconnected Electron-Transport Pathway Enables High-Efficiency Organic Solar Cells
Xiaobin Gu, Rui Zeng, Tengfei He, Guanqing Zhou, Congqi Li, Na Yu, Fei Han, Yuqi Hou, Jikai Lv, Ming Zhang, Jianqi Zhang, Zhixiang Wei, Zheng Tang, Haiming Zhu, Yunhao Cai, Guankui Long, Feng Liu, Xin Zhang and Hui Huang
Advanced Materials 23, 2401370 (2024)
Achieving desirable charge-transport highway is of vital importance for high-performance organic solar cells (OSCs). Here, it is shown how molecular packing arrangements can be regulated via tuning the alkyl-chain topology, thus resulting in a 3D network stacking and highly interconnected pathway for electron transport in a simple-structured nonfused-ring electron acceptor (NFREA) with branched alkyl side-chains. As a result, a record-breaking power conversion efficiency of 17.38% (certificated 16.59%) is achieved for NFREA-based devices, thus providing an opportunity for constructing low-cost and high-efficiency OSCs.