Abstract
Four organic donor–π–conjugated-acceptor (D–π–A) type II dyes with different thiophene linkers are reported for dye sensitized solar cells (DSSCs). For the first time, a donor (triphenylamine) was introduced in type II sensitizers, and 2-hydroxybenzonitrile as acceptor/anchoring moiety was covalently linked TiO2 particles. The dye LS203 in this series gives the best solar energy conversion efficiency of 3.4%, with Jsc=7.4mAcm−2, Voc=0.67V, FF=0.69, the maximum IPCE value reaches 66.9%.
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