Side chain effect on poly(beznodithiophene-co-dithienobenzoquinoxaline) and their applications for polymer solar cells
2015; Elsevier BV; Volume: 82; Linguagem: Inglês
10.1016/j.polymer.2015.11.052
ISSN1873-2291
AutoresJingzhe Fan, Yong Zhang, Caili Lang, Meng Qiu, Jinsheng Song, Renqiang Yang, Fengyun Guo, Qingjiang Yu, Jinzhong Wang, Liancheng Zhao,
Tópico(s)Perovskite Materials and Applications
ResumoTwo conjugated polymers (PBDT86-TQ and PBDT88-TQ) with different side chains, but with the same polymer backbone, have been prepared for polymer solar cells. The side chains in the two polymers induced different steric hindrance. PBDT86-TQ showed the 0-0 absorption peak at ∼740 nm, and it was blue-shifted to ∼660 nm for PBDT88-TQ as a result of strong steric hindrance from two dioctyl chains. Further, the HOMO energy levels of PBDT86-TQ (−5.10 eV) and PBDT88-TQ (−5.54 eV) also showed a large difference. The hole mobility of PBDT88-TQ is ∼70 times higher than that of PBDT86-TQ. The photovoltaic cells based on PBDT86-TQ gave a very low PCE of 0.69–0.80%, and for PBDT88-TQ-based cells, the PCEs were improved to 3.70–4.50% with a Voc of up to 0.98 V and improved Jsc and FF. These results show the importance of side chains on the design of conjugated polymers for high performance polymer solar cells.
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