New Wide Band Gap Donor for Efficient Fullerene-Free All-Small-Molecule Organic Solar Cells
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- 作者：Liyan Yang ; Shaoqing Zhang ; Chang HeJianqi Zhang ; Huifeng Yao ; Yang Yang ; Yun Zhang ; Wenchao Zhao ; Jianhui Hou
- 刊名：Journal of the American Chemical Society
- 出版年：2017
- 出版时间：February 8, 2017
- 年：2017
- 卷：139
- 期：5
- 页码：1958-1966
- 全文大小：775K
- ISSN：1520-5126
文摘
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 (Egopt) 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 (Voc = 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.