Journal of Polymer Science Part A: Polymer Chemistry, Vol.49, No.6, 1427-1433, 2011
Synthesis and Photovoltaic Behaviors of Narrow-Band-Gap pi-Conjugated Polymers Composed of Dialkoxybenzodithiophene- and Thiophene-Based Fused Aromatic Rings
pi-Conjugated polymers, PBDT-CNETT and PBDT-CNECPDT, were prepared by the Stille cross-coupling polymerization. Optical and thermal properties of the obtained polymers were investigated by UV-vis spectroscopy and thermogravimetric analysis. PBDT-CNETT and PBDT-CNECPDT exhibited very narrow band gaps of 1.39 and 1.13 eV, respectively. Highest occupied molecular orbital energy levels estimated by surface analyzer were -5.17 and -5.11 eV for PBDT-CNETT and PBDT-CNECPDT, respectively. The solar cells based on these polymers wee evaluated with the cell configuration of ITO/PEDOT-PSS/polymer:PC61BH/LiF/Al. The power conversion efficiencies of the solar cells were estimated to be 1.57 and 0.16% for PBDT-CNETT and PBDT-CNECPDT, respectively. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 1427-1433, 2011
Keywords:pi-conjugated polymer;conjugated polymers;copolymerization;heteroatom-containing polymers;low band gap;photovoltaic cell;polymer solar cell