Journal of Materials Chemistry p. 17724 - 17731 (2012)
Update date:2022-08-29
Topics:
Chen, Xuewen
Liu, Bo
Zou, Yingping
Xiao, Lu
Guo, Xiuping
He, Yuehui
Li, Yongfang
A new donor-acceptor type copolymer, namely poly{4,8-bis(2-ethylhexyloxy) benzo[1,2-b:3,4-b′]difuran-alt-6-octylnaphtho[2,3-c]thiophene-4,9-dione} (PBDFNTDO) was synthesized by a Stille coupling reaction and characterized by 1H NMR, GPC, TGA, UV-Vis absorption spectroscopy and cyclic voltammetry. PBDFNTDO is readily soluble in common organic solvents with a number-average molecular weight (Mn) of 10.7 kDa mol-1 and a polydispersity index of 1.71. TGA analysis shows the copolymer exhibits good thermal stability with 5% weight loss at a temperature of 341 °C. PBDFNTDO possesses a broad absorption band at 300-750 nm with an optical bandgap of 1.65 eV. Cyclic voltammetry gives HOMO and LUMO energy levels of -5.33 eV and -3.40 eV, respectively. The hole mobility of PBDFNTDO:PC71BM (1:1.5, w/w) reaches up to 5.0 × 10-3 cm2 V-1 s -1 by the space-charge-limited current (SCLC) method. A polymer solar cell with the configuration of ITO/PEDOT:PSS/PBDFNTDO:PC71BM (1:1.5, w/w)/Ca/Al demonstrates a promising power conversion efficiency of 4.71% under the illumination of AM 1.5 G, 100 mW cm-2.
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Doi:10.1021/jo00021a001
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