An Isoindigo-Based "Double-Cable" Conjugated Polymer for Single- Component Polymer Solar Cells

An isoindigo-based double-cable conjugated polymer bearing perylene bisimide side units was developed via Stille polymerization for application in single-component polymer solar cells, in which a power conversion efficiency of 1% with broad photo-response from 300nm to 800nm was achieved. There is no evidence of large phase separation confirmed by AFM images and photoluminescence (PL) spectra. The space charge limit current measurements and light intensity dependence measurements indicate that the low electron mobility and the significant recombination of photogenerated charge carriers in active layer mainly account for the low performance of our solar cells. Our results suggest that these double-cable are promising candidates for use in single-component polymer solar cells with NIR photoresponse.