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A fused-ring based electron acceptor for efficient non-fullerene polymer solar cells with small HOMO offset
Article in journal
Yongxi Li, Deping Qian, Lian Zhong, Jiu-Dong Lin, Zuo-Quan Jiang, Zhi-Guo Zhang, Zhanjun Zhang, Yongfang Li, Liang-Sheng Liao, Fengling Zhang
Publication Year
NANO ENERGY, 2016, (27), 430-438
Link to Source (DOI)
<p>A non-fullerene electron acceptor bearing a novel backbone with fused 10-heterocyclic ring (in-dacenodithiopheno-indacenodiselenophene), denoted by IDTIDSe-IC is developed for fullerene free polymer solar cells. IDTIDSe-IC exhibits a low band gap (E-g=1.52 eV) and strong absorption in the 600850 nm region. Combining with a large band gap polymer J51 (E-g=1.91 eV) as donor, broad absorption coverage from 300 nm to 800 nm is obtained due to complementary absorption of J51 and IDTIDSe-IC, which enables a high PCE of 8.02% with a V-oc of 0.91 V, a J(SC) of 15.16 mA/cm(2) and a FF of 58.0% in the corresponding PSCs. Moreover, the EQE of 50-65% is achieved in the absorption range of IDTIDSe-IC with only about 0.1 eV HOMO difference between J51 and IDTIDSe-IC. (C) 2016 Elsevier Ltd. All rights reserved.</p>