Zhang, XiaoyuXu, YaoyaoGiordano, FabrizioSchreier, MarcelPellet, NormanHu, YueYi, ChenyiRobertson, NeilHua, JianliZakeeruddin, Shaik M.Tian, HeGraetzel, Michael2016-10-182016-10-182016-10-18201610.1021/jacs.6b05281https://infoscience.epfl.ch/handle/20.500.14299/130296WOS:000382513300007Dye-sensitized solar cells (DSSCs) have shown significant potential for indoor arid building integrated photovoltaic applications. Herein we present three new D-A-pi-A organic sensitizers, XY1, XY2, and XY3, that exhibit high molar extinction coefficients and a broad absorption range. Molecular modifications of these dyes, featuring a benzothiadiazole (BTZ) auxiliary acceptor, were achieved by introducing a thiophene heterocycle as well as by shifting the, position of BTZ on the conjugated bridge. The ensuing high molar absorption coefficients enabled the fabrication of highly efficient thin-film solid-state DSSCs with only 1.3 mu m mesoporous TiO2 layer. XY2 with a molar extinction coefficient of 6.66 X 10(4) M-1 cm(-1) at 578 nm led to the best photovoltaic performance of 7.51%.text::journal::journal article::research article