- Side chain effect on poly(beznodithiophene-co-dithienobenzoquinoxaline) and their applications for polymer solar cells
-
Two 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.
- Fan, Jingzhe,Zhang, Yong,Lang, Caili,Qiu, Meng,Song, Jinsheng,Yang, Renqiang,Guo, Fengyun,Yu, Qingjiang,Wang, Jinzhong,Zhao, Liancheng
-
p. 228 - 237
(2015/12/18)
-