Highly efficient organic dyes containing a benzopyran ring as a π–bridge for DSSCs

Abstract

A series of novel organic dyes containing a benzopyran ring as a π–bridge have been designed and applied in dye-sensitized solar cells (DSSCs). This series of dyes show the excellent DSSCs' performance, due to their efficient light-to-photocurrent conversion in the region from 380 nm to 600 nm, with the highest IPCE values exceeding 90%. Through modification of the donor units, an efficiency as high as 7.5% has been achieved under standard light illumination (AM 1.5G, 100 mW cm−2) by the dye CC103.