Asymmetric substitution of end-groups helps to achieve efficient all-small-molecule organic solar cells

https://techxplore.com/news/2022-07-asymmetric-substitution-end-groups-efficient-all-small-molecule.html

"Blending acceptor N3, SM-CA-Reh substituted with asymmetric end-groups CA and Reh... integrated photovoltaic advantages high fill factor (FF) SM-CA and high short-circuit current density (Jsc) SM-Reh.... SM-CA-Reh achieved increased FF 77.5% and PCE 16.34%... highest PCE reported for binary all-small-molecule OSCs... stacking morphology blend films determined by π–π interaction instead of dipole effect or crystallinity... asymmetric substitution of end-groups in molecular donors"