A chlorinated low-bandgap small-molecule acceptor for organic solar cells with 14.1% efficiency and low energy loss

被引：212
作者：
Kan, Bin [1 ,2 ]
Feng, Huanran [1 ,2 ]
Yao, Huifeng [3 ]
Chang, Meijia [1 ,2 ]
Wan, Xiangjian [1 ,2 ]
Li, Chenxi [1 ,2 ]
Hou, Jianhui [3 ]
Chen, Yongsheng [1 ,2 ]
机构：
[1] Nankai Univ, Coll Chem, Ctr Nanoscale Sci & Technol, State Key Lab & Inst Elementoorgan Chem, Tianjin 300071, Peoples R China
[2] Nankai Univ, Coll Chem, Key Lab Funct Polymer Mat, Tianjin 300071, Peoples R China
[3] Chinese Acad Sci, Inst Chem, CAS Res Educ Ctr Excellence Mol Sci, Beijing Natl Lab Mol Sci,State Key Lab Polymer Ph, Beijing 100190, Peoples R China
来源：
SCIENCE CHINA-CHEMISTRY | 2018年 / 61卷 / 10期
基金：
中国国家自然科学基金;
关键词：
small-molecule acceptor; low-bandgap; chlorinated; high performance; NON-FULLERENE ACCEPTORS; ELECTRON-ACCEPTORS; POLYMER; DESIGN; DONOR; GAP; PHOTOVOLTAICS;
D O I：
10.1007/s11426-018-9334-9
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A new acceptor-donor-acceptor (A-D-A) type small-molecule acceptor NCBDT-4Cl using chlorinated end groups is reported. This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600-900 nm with a narrow optical bandgap of 1.40 eV. The device based on PBDB-T-SF:NCBDT-4Cl shows a power conversion efficiency (PCE) of 13.1% without any post-treatment, which represents the best result for all as-cast organic solar cells (OSCs) to date. After device optimizations, the PCE was further enhanced to over 14% with a high short-circuit current density (J (sc)) of 22.35 mA cm(-2) and a fill-factor (FF) of 74.3%. The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. To our knowledge, this outstanding efficiency of 14.1% with an energy loss as low as 0.55 eV is among the best results for all single-junction OSCs.
引用
收藏
页码：1307 / 1313
页数：7
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