Effects of Substitution on Photovoltaic Performance in Benzothiadiazole-based NIR-absorbing Small-Molecule Acceptor Solar Cells
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초록
내용
Non-fullerene small-molecule acceptors (NFAs) have attracted considerable attention in organic solar cells with excellent performence. However, large fused-ring NFAs involves synthetic complexities. A-D-A’-D-A type non fused ring NFAs have received extensive attention due to the potential to synthetic simplicity, promising sunlight harvesting capability.Despite these advantages, less attention has yet been paid to the study of substitution on A’ core. In this presentation, to deeply understand the effects of electron-donating and electron accepting substitution on the A’ core, three A-D-A’-D-A type NFRAs with different substitutions on benzo[c][1,2,5]thiadiazole core, as hydrogen, alkoxy, and fluorine groups, respectively. The NFAs showed considerable variations in optical, electrochemical, and morphological properties Among the NFAs, alkoxy substituted NFA showed a high-lying frontier energy level and a well-mixed morphology with suppressed charge recombination.