Nowadays,wide-bandgap(WBG)copolymers attract great attention in the field of organic photovoltaics[1].They are ideal electron-donating partners for low-bandgap small molecule acceptors[2-12].With good energy levels ma...Nowadays,wide-bandgap(WBG)copolymers attract great attention in the field of organic photovoltaics[1].They are ideal electron-donating partners for low-bandgap small molecule acceptors[2-12].With good energy levels matching,the blend of WBG copolymer donor and small molecule acceptor can harvest most of the sunlight and deliver high power conversion efficiencies(PCEs)in solar cells.PCEs higher than 16%have been achieved[13-15].WBG copolymers especially those with ultra-wide bandgaps(i.e.,optical bandgap(Eg opt)>2.07 eV,absorption onset<600 nm)can find applications in ternary solar cells[16]and tandem solar cells[17].Currently,ultra-WBG copolymer donors are less efficient,generally giving PCEs below 13%[18].Designing highly efficient ultra-WBG copolymers is needed.In this work,we use fluorine-and alkoxyl-substituted benzene(FAB)as the building block to construct ultra-WBG copolymer donors.展开更多
基金the National Key Research and Development Program of China(2017YFA0206600)the National Natural Science Foundation of China(51773045,21572041,21772030 and 51922032)the Youth Association for Promoting Innovation(CAS)for financial support
文摘Nowadays,wide-bandgap(WBG)copolymers attract great attention in the field of organic photovoltaics[1].They are ideal electron-donating partners for low-bandgap small molecule acceptors[2-12].With good energy levels matching,the blend of WBG copolymer donor and small molecule acceptor can harvest most of the sunlight and deliver high power conversion efficiencies(PCEs)in solar cells.PCEs higher than 16%have been achieved[13-15].WBG copolymers especially those with ultra-wide bandgaps(i.e.,optical bandgap(Eg opt)>2.07 eV,absorption onset<600 nm)can find applications in ternary solar cells[16]and tandem solar cells[17].Currently,ultra-WBG copolymer donors are less efficient,generally giving PCEs below 13%[18].Designing highly efficient ultra-WBG copolymers is needed.In this work,we use fluorine-and alkoxyl-substituted benzene(FAB)as the building block to construct ultra-WBG copolymer donors.
