Abstract
Two new alternating oligomers, poly[5,5′-(1-(2,6-diisopropylphenyl)-2,5-di(2-thienyl)pyrrole)-alt-4,7-(2,1,3-benzothiadiazole)] (TPyTBz-1) and poly[5,5′-(1-(4-octylphenyl)-2,5-di(2-thienyl)pyrrole)-alt-4,7-(2,1,3-benzothiadiazole)] (TPyTBz-2), were synthesized and characterized. Thermogravimetric analysis (TGA) showed that the oligomers are thermally stable, with the 5% weight loss temperature of over 345°C. The absorption spectra of the oligomers were found to be quite broad from 300nm to 800nm, and the optical band gaps were calculated from the onset wavelength of the optical absorption in film to be 1.49eV and 1.60eV, respectively. The electrochemical studies of the oligomers showed that the energy levels are suitable for bulk heterojunction (BHJ) solar cell applications. Under 100mW/cm2 of AM 1.5 white-light illumination, the photovoltaic properties of BHJ solar cell devices containing an active layer of electron donor oligomer mixed with electron acceptor [6,6]-phenyl C70-butyric acid methyl ester (PC70BM) at different weight ratios were investigated. The solar cell device containing TPyTBz-1:PC70BM (1:5wt%) as an active layer was found to show the best power conversion efficiency (PCE) of 1.30% with an open-circuit voltage of 0.45V, a short-circuit current of 9.4mA/cm2, and a fill factor of 0.31.
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