期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 5, 页码 1958-1966出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b11612
关键词
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资金
- Ministry of Science and Technology of China [2014CB643501]
- NSFC [21325419, 91333204, 21604017, 51373181]
- Chinese Academy of Sciences [XDB12030200, KJZD-EW-J01]
A new organic small molecule, DRTB-T, that incorporates a two-dimensional trialkylthienyl-substituted benzodithiophene core building block was designed and synthesized. DRTB-T has a band gap (E-g(opt)) of 2.0 eV with a low-lying highest occupied molecular orbital (HOMO) level of-5.51 eV. Nonfullerene small-molecule solar cells consisting of DRTB-T and a nonfullerene acceptor (IC-C6IDT-IC) were constructed, and the morphology of the active layer was fine-tuned by solvent vapor annealing (SVA). The device showed a record 9.08% power conversion efficiency (PCE) with a high open-circuit voltage (V-oc = 0.98 V). This is the highest PCE for a nonfullerene small-molecule organic solar cell (NFSM-OSC) reported to date. Our notable results demonstrate that the molecular design of a wide band gap (WBG) donor to create a well-matched donor acceptor pair with a low band gap (LBG) nonfullerene small-molecule acceptor, as well as subtle morphological control, provides great potential to realize high-performance NFSM-OSCs.
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