Abstract
The following soluble π-conjugated polymer was synthesized by palladium-catalyzed Suzuki polymerization: poly[(9,9-dioctylfluorene)-alt-(3-hexylthiophen-5-yl)-(4′-hexylthiazol-5′-yl)] poly(FO-HThHTha) derived from poly(9,9-dioctylfluorene) (PFO) and poly[(3-hexylthiophen-5-yl)-2,2′-(4′-hexylthiazol-5′-yl)] poly(HThHTa). The polymer, poly(FO-HThHTa) was soluble in common organic solvents and easily spin coated onto indium-tin oxide (ITO) coated glass substrates. Bulk heterojunction photovoltaic cells with an ITO/PEDOT/poly(FO-HThHTa):PC70BM/TiOx/Al configuration were fabricated and the photovoltaic cell using poly(FO-HThHTa):PC70BM (1:4) showed the best photovoltaic performance compared with those using poly(FO-HThHTa):PC70BM (1:2 and 1:6). The optimal bulk heterojunction photovoltaic cell exhibits a power conversion efficiency (PCE) of 0.39% (Voc = 0.44 V, Jsc = 2.57, FF = 0.34) with poly(FO-HThHTa):PC70BM (1:4) measured by using an AM 1.5 G irradiation (100 mW/cm2) on an Oriel Xenon solar simulator (Oriel 300 W).
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