期刊
SCIENCE CHINA-CHEMISTRY
卷 61, 期 10, 页码 1307-1313出版社
SCIENCE PRESS
DOI: 10.1007/s11426-018-9334-9
关键词
small-molecule acceptor; low-bandgap; chlorinated; high performance
资金
- National Natural Science Foundation of China [91633301, 51773095]
- MoST of China [2014CB643502]
- Tianjin city [17JCJQJC44500, 17CZDJC31100]
- 111 Project [B12015]
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.
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