文献类型：期刊文献

英文题名：Medium bandgap A-DA′D-A type small molecule acceptors prepared using synergetic modification strategies enable high-performance organic solar cells

作者：Li, Yuechen Gong, Yufei Li, Xiaojun He, Haozhe Qin, Shucheng Zhang, Jinyuan Zhang, Jianqi Pan, Fei Meng, Lei Li, Yongfang

第一作者：Li, Yuechen

通信作者：Li, XJ[1];Li, XJ[2]

机构：[1]Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China;[2]Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China;[3]Natl Ctr Nanosci & Technol, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China;[4]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550025, Peoples R China;[5]Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou Key Lab Novel Semicond Mat & Devices, Lab Adv Optoelect Mat, Suzhou 215123, Jiangsu, Peoples R China

第一机构：Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China;corresponding author), Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China.

年份：2025

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20254219336507);Scopus(收录号：2-s2.0-105018694347);WOS:【SCI-EXPANDED(收录号:WOS:001576918800001)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 52203248 and 52173188), the Beijing Nova Program (No. 20240484597), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB0520102), the National Key Research and Development Program of China (No. 2024YFB4205200), and the Natural Science Foundation of Guizhou Province (No. QKHJC-ZK (2022) YB181).

语种：英文

外文关键词：Carrier transport - Chlorine - Chlorine compounds - Energy gap - Molecules - Morphology - Photovoltaics - Solar cells - Solar power generation - Synthesis (chemical)

摘要：Organic solar cells (OSCs) are promising candidates for next-generation photovoltaic technologies due to their inherent advantages of light weight and mechanical flexibility. In recent years, advancements in photovoltaic materials and device fabrication technologies have driven significant improvements in the power conversion efficiency (PCE) of OSCs. Introducing medium-bandgap small molecule acceptors (SMAs) as secondary acceptors into ternary OSCs is an effective strategy to further improve the PCE of OSCs. In this study, we synthesized a series of SMAs Cl24-F, Cl24-H and Cl24-I based on Y6 by employing multiple synergistic modification strategies to expand the molecular bandgap. Among them, Cl24-F yields the highest PCE but exhibits a low open-circuit voltage (Voc), while Cl24-I suffers from excessive aggregation, leading to poor film morphology. In contrast, Cl24-H features the highest lowest unoccupied molecular orbital energy level (ELUMO) and the widest bandgap, resulting in a notably high Voc of 1.01 V in corresponding OSCs. Interaction analyses further confirmed that Cl24-H possesses excellent miscibility with both PM6 donor and BTA-E3 acceptor. Consequently, when Cl24-H was incorporated as a secondary acceptor into the PM6:BTA-E3 system, the PM6:BTA-E3:Cl24-H based ternary OSCs exhibited increased Voc and short-circuit current density (Jsc), achieving a remarkable PCE of 20.2%. This enhancement is primarily attributed to improved exciton dissociation, balanced charge transport and suppressed carrier recombination enabled by Cl24-H. This work underscores the importance of synthesizing efficient medium-bandgap acceptors and demonstrates their feasibility as third components for boosting OSCs' performance.