Side-Chain Engineering of Fused-Ring Electron Acceptors towards High Efficiency of Polymer Solar Cells

We report structure evolution of fused-ring electron acceptors(FREAs)towards high efficiency of polymer solar cells(PSCs).Changing the side-chains in IC-IDT-IC from alkylphenyl to alkyl leads to more ordered molecular packing,red-shifted absorption spectrum and improved electron mobility,which helps improve the efficiency from 7.39%to 9.20%,We report structure evolution of fused-ring electron acceptors(FREAs)towards high efficiency of polymer solar cells(PSCs).Changing the side-chains in IC-IDT-IC from alkylphenyl to alkyl leads to more ordered molecular packing,red-shifted absorption spectrum and improved electron mobility,which helps improve the efficiency from 7.39%to 9.20%,聚合物分子工程国家重点实验室、复旦大学高分子科学系