堆积
结晶度
电子受体
能量转换效率
有机太阳能电池
接受者
分子内力
材料科学
带隙
富勒烯
化学工程
纳米技术
化学
光化学
光电子学
有机化学
物理
复合材料
工程类
聚合物
凝聚态物理
作者
Chenyang Han,Huanhuan Gao,Yanna Sun,Yuanyuan Kan,Zhaozhao Bi,Wei Ma,Yani Zhang,Juan Antonio Zapien,Yingguo Yang,Ke Gao
标识
DOI:10.1016/j.jechem.2024.02.026
摘要
Design and synthesis of superior cost-effective non-fullerene acceptors (NFA) are still big challenges for facilitating the commercialization of organic solar cells (OSCs), yet to be realized. Herein, two medium bandgap fully non-fused ring electron acceptors (NFREAs, medium bandgap, i.e., 1.3–1.8 eV), namely PTR-2Cl and PTR-4Cl are synthesized with only four steps by using intramolecular noncovalent interaction central core, structured alkyl side chain orientation linking units and flanking with different electron-withdrawing end group. Among them, PTR-4Cl exhibits increased average electrostatic potential (ESP) difference with polymer donor, enhanced crystallinity and compact π-π stacking compared with the control molecule PTR-2Cl. As a result, the PTR-4Cl-based OSC achieved an impressive power conversion efficiency (PCE) of 14.72%, with much higher open-circuit voltage (Voc) of 0.953 V and significantly improved fill factor (FF) of 0.758, demonstrating one of the best acceptor material in the top-performing fully NFREA-based OSCs with both high PCE and Voc. Notably, PTR-4Cl-based cells maintain a good T80 lifetime of its initial PCE after over 936 h under a continuous thermal annealing treatment and over 1300 h T80 lifetime without encapsulation. This work provides a cost-effective design strategy for NFREAs on obtaining high Voc, efficient exciton dissociation, and ordered molecular packing and thus high-efficiency and stable OSCs.
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