Highly Efficient and Stable Organic Solar Cells Enabled by Engineering of Backbone Building Unit and Regioregularity in Dimerized Small Molecule Acceptors
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초록
내용
Recently, in organic solar cell (OSC) field, dimerized small-molecule acceptor (DSMA), which shows high power conversion efficiency and long-term stability, has been studied. However, the effect of the regioisomerism and the number of donating linker units has rarely been studied. In this research, we design new DSMA series with different linker regioisomers (in/out) and the number of the linker (selenophene (Se) / biselenophene (BiSe)). It is revealed that the change of linker regioregularity causes difference in electron charge mobility (μe) which results from molecular planarity and LUMO distribution difference. Also the number of linkers significantly affects solubility and blend morphology. This study will provide a useful strategy to design efficient DSMA for reproducing remarkably stable and efficient OSCs.