The power conversion efficiencies of organic solar cells(OSCs)have routinely lagged far behind those of their inorganic counterparts.However,owing to the enor-mous contributions of many researchers,the power conversio...The power conversion efficiencies of organic solar cells(OSCs)have routinely lagged far behind those of their inorganic counterparts.However,owing to the enor-mous contributions of many researchers,the power conversion efficiencies of OSCs have rapidly improved and now exceed 19%.The charge generation mechanisms in OSCs have been heavily debated during this period while acquiring valuable knowl-edge.This review highlights fundamental and cutting-edge research that rationalizes why OSCs can generate photocurrent so efficiently.In particular,a photophysi-cist’s views on exciton diffusion to donor:acceptor interfaces,charge transfer at the donor:acceptor interface,and long-range spatial dissociation of charge transfer states are discussed.Although a general consensus in this area has not been reached yet,recent time-resolved spectroscopic measurements provide important photophys-ical insights that can help achieving a better understanding of the charge generation mechanism in OSCs.Based on these observations,future research directions for realizing further improvements in OSC performance are discussed.展开更多
基金partly supported by the JST PRESTO program Grant Number JPMJPR1874,JSPS KAKENHI Grant Numbers 17K14527,21H02012,21H05394,and 22K19065The Murata Science Foundation+1 种基金The Sumitomo FoundationOgasawara Toshiaki Memorial Foundation.
文摘The power conversion efficiencies of organic solar cells(OSCs)have routinely lagged far behind those of their inorganic counterparts.However,owing to the enor-mous contributions of many researchers,the power conversion efficiencies of OSCs have rapidly improved and now exceed 19%.The charge generation mechanisms in OSCs have been heavily debated during this period while acquiring valuable knowl-edge.This review highlights fundamental and cutting-edge research that rationalizes why OSCs can generate photocurrent so efficiently.In particular,a photophysi-cist’s views on exciton diffusion to donor:acceptor interfaces,charge transfer at the donor:acceptor interface,and long-range spatial dissociation of charge transfer states are discussed.Although a general consensus in this area has not been reached yet,recent time-resolved spectroscopic measurements provide important photophys-ical insights that can help achieving a better understanding of the charge generation mechanism in OSCs.Based on these observations,future research directions for realizing further improvements in OSC performance are discussed.
