期刊
POLYMER CHEMISTRY
卷 4, 期 3, 页码 470-476出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2py20580g
关键词
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资金
- NSFC [51173206, 21161160443]
- National High Technology Research and Development Program [2011AA050523]
- Natural Science Foundation of Hunan Province, China [11JJ4010]
- China Postdoctoral Science Foundation [20110490150]
- Fundamental Research Funds for the Central Universities [2010QZZD0112]
A new low bandgap conjugated polymer-PBDFTT-C was synthesized from thieno-[3,4-b] thiophene and benzo[1,2-b:4,5-b'] difuran units by Stille coupling reactions. The structure was verified by H-1 NMR and elemental analysis, the molecular weight was determined by gel permeation chromatography (GPC) and the thermal properties were investigated by thermogravimetric analysis (TGA). PBDFTT-C showed a low HOMO energy level of -5.27 eV. The polymer film displayed broad absorption in the wavelength region from 300 nm to 840 nm with a low bandgap of 1.48 eV. The field effect hole mobility of PBDFTT-C reached 5.4 x 10(-3) cm(2) V-1 s(-1). By using 1,8-diiodooctane (DIO) as the solvent additive, photovoltaic cells with the structure of ITO/PEDOT:PSS/PBDFTT-C:PC71BM (1 : 1.5, w/w)/Ca/Al demonstrated a power conversion efficiency of 4.4% with a short circuit current of 10.45 mA cm(-2), open circuit voltage of 0.66 V and a fill factor of 0.64, under the illumination of AM 1.5G, 100 mW cm(-2).
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