期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 14, 页码 4955-4961出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b02004
关键词
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资金
- 973 Program [2013CB834702]
- NSFC [91433114, 51261130582, 21504058, 21504006]
- International Science & Technology Cooperation Program of China [2014DFA52820]
- 111 project [B14009]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Department of the Navy, Office of Naval Research [N00014-14-1-0580]
We develop an efficient fused-ring electron acceptor (ITIC-Th) based on indacenodithieno [3,2-b]-thiophene core and thienyl side-chains for organic solar cells (OSCs). Relative to its counterpart with phenyl side-chains (ITIC), ITIC-Th shows lower energy levels (ITIC-Th: HOMO = -5.66 eV, LUMO =-3.93 eV; ITIC: HOMO = -5.48 eV, LUMO =-3.83 eV) due to the a-inductive effect of thienyl side-chains, which can match with high-performance narrow-band-gap polymer donors and wide-band-gap polymer donors. ITIC-Th has higher electron mobility (6.1 X 10(-4) cm(2) V-1 s(-1)) than ITIC (2.6 X 10(-4) cm(2) V-1 s(-1)) due to enhanced intermolecular interaction induced by sulfur-sulfur interaction. We fabricate OSCs by blending ITIC-Th acceptor with two different low-band-gap and wide-band-gap polymer donors. In one case, a power conversion efficiency of 9.6% was observed, which rivals some of the highest efficiencies for single junction OSCs based on fullerene acceptors.
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