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  1. ; ; ; ; ; ( , Physical Chemistry Chemical Physics)
    Four organic sensitizers incorporating a cross-conjugated cyclopenta[2,1- b :3,4- b ′]dithiophene (CPDT) π-bridge have been synthesized. As a result of molecular engineering, broad high energy bands and red shifted absorption maxima and onset is observed relative to a benchmark analogue ( C218 ) using a non-cross-conjugated CPDT π-bridge. The use of a cross-conjugated bridge allows a new strategy for tuning dye energetics and introduction of increased absorption uniformity by adding additional high-energy absorption bands. These dyes show solar-to-electric conversion up to 800 nm with one derivative exceeding the performance of C218 under identical conditions. 
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