Panchromatic cross-conjugated π-bridge NIR dyes for DSCs.
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Physical chemistry chemical physics : PCCP, ISSN: 1463-9084, Vol: 20, Issue: 4, Page: 2438-2443
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- Physics and Astronomy; Chemistry; Physical Sciences and Mathematics
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.