材料科学
有机太阳能电池
能量转换效率
接受者
热稳定性
分子
光伏系统
分子间力
真空蒸发
吸收(声学)
小分子
光电子学
纳米技术
化学工程
薄膜
有机化学
聚合物
化学
工程类
复合材料
生态学
物理
生物化学
生物
凝聚态物理
作者
Bin‐Wen Chen,Ming‐Wei An,Yunfei Li,Xu Wang,Zhen‐Lin Qiu,Le‐Shan Dai,Kun Cao,Ke‐Yue Yang,Daqin Yun,Lin‐Long Deng,Su‐Yuan Xie,Lan‐Sun Zheng
标识
DOI:10.1002/adfm.202509380
摘要
Abstract The simultaneous improvement of efficiency and stability of small‐molecule organic solar cells (SMOSCs) for commercialization remains a challenging task. Herein, two novel donor–acceptor–acceptor (D–A–A)‐configured small‐molecule donors, DTDCPB‐F and DTDCPB‐Cl, with F‐substituted and Cl‐substituted 2,1,3‐benzothiadiazole as the central A group, are synthesized and characterized. The influences of fluorination and chlorination on the optoelectronic properties, molecular packing, and photovoltaic performance are systematically investigated. The fluorinated DTDCPB‐F exhibits stronger and broader optical absorption as well as stronger intermolecular interactions and more compact packing, compared to its chlorinated analog DTDCPB‐Cl. Consequently, vacuum‐deposited SMOSCs based on DTDCPB‐F: C 70 show a remarkable power conversion efficiency (PCE) of 10.43%, surpassing that of the DTDCPB‐Cl: C 70 (8.03%). Notably, the PCE of 10.43% for DTDCPB‐F: C 70 based device is the record efficiency for single‐junction vacuum‐deposited SMOSCs. Furthermore, DTDCPB‐F: C 70 devices demonstrate outstanding stability in terms of storage, light‐soaking, and thermal stability. In particular, the DTDCPB‐F: C 70 based device maintains 92% of its initial PCE over 2 years (800 days) of storage in a nitrogen‐filled glove box. These results demonstrate that fluorination is an effective approach to construct small‐molecule donors for achieving highly efficient and stable vacuum‐deposited SMOSCs.
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