Engineering Backbone Building Blocks and Regioregularity of Polymerized Small-Molecule Acceptors Enables Efficient All-Polymer Solar Cells with High Electron Mobility
발표자
()
초록
내용
Charge transport ability of polymer acceptors is an essential requirement for achieving high power conversion efficiencies of all-polymer solar cells (all-PSCs). Here, we design a new series of the polymerized SMA-based PA materials (Y5-A-B, A= selenophene (Se)/ biselenophene (BiSe) and B= In/Mix/Out) for enhancing the µe and, thus, PCE of all-PSCs. In detail, i) donating moieties (Se/BiSe) and ii) backbone regioregularities (In/Mix/Out) are two-dimensionally controlled to yield six different PAs. We successfully demonstrate the importance of this two-dimensional control the electrical properties of the PAs. The most interesting finding here is that the In/Mix/Out regioisomer effects on the PA¬ properties are completely different depending on the Se/BiSe donating unit in the PA. Overall, we observe a strong, direct relationship between the µe and PCE of all-PSCs.