All-polymer solar cells(all-PSCs)have received extensive attention due to their excellent mechanical robustness and perfor-mance stability.However,the power conversion efficiency(PCE)of all-PSCs still lags behind those of organic solar cells(OSCs)based on non-fullerene small molecule acceptors.Herein,we report highly efficient all-PSCs via sequential deposition(SD)with donor and acceptor layers coated sequentially to optimize the film microstructure.Compared with the bulk heterojunction(BHJ)all-PSCs,an optimized morphology with vertical component distribution was achieved for the SD-processed all-PSCs due to the synergistic effect of swelling of polymer films and using additive.Such strategy involves using chlorobenzene as the first layer processing-solvent for polymer donor,chloroform as the second processing-solvent for polymer acceptor with trace l-chlor-onaphthalene,efficiently promoting exciton dissociation and charge extraction and reducing trap-assisted recombination.Consequently,over 16％all-PSCs fabricated via SD method was realized for the first time,which is much higher than that(15.2％)of its BHJ counterpart and also among the highest PCEs in all-PSCs.We have further demonstrated the generality of this approach in various all-polymer systems.This work indicates that the SD method can yield excellent all-PSCs and provides a facile approach to fabricating high-performance all-PSCs.

Bangbang Li;Xuanyu Zhang;Ziang Wu;Jie Yang;Bin Liu;Qiaogan Liao;Junwei Wang;Kui Feng;Rui Chen;Han Young Woo;Fei Ye;Li Niu;Xugang Guo;Huiliang Sun

Department of Materials Science and Engineering,Southern University of Science and Technology(SUSTech),Shenzhen 518055,China;Department of Electrical and Electronic Engineering,Southern University of Science and Technology(SUSTech),Shenzhen 518055,China;Department of Chemistry,Korea University,Seoul 136-713,Republic of Korea;Center for Advanced Analytical Science,School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,SUSTech,Shenzhen 518055,China

中国科学:化学（英文版）

[1]Bangbang Li;Xuanyu Zhang;Ziang Wu;Jie Yang;Bin Liu;Qiaogan Liao;Junwei Wang;Kui Feng;Rui Chen;Han Young Woo;Fei Ye;Li Niu;Xugang Guo;Huiliang Sun-.Over 16％efficiency all-polymer solar cells by sequential deposition)[J].中国科学:化学（英文版）,2022(06):1157-1163

onaphthalene

Over,efficiency,polymer,solar,cells,by,deposition,All,PSCs,have,received,extensive,attention,due,their,excellent,mechanical,robustness,stability,However,power,conversion,still,lags,behind,those,organic,OSCs,fullerene,small,molecule,acceptors,Herein,report,highly,via,donor,layers,coated,sequentially,microstructure,Compared,bulk,heterojunction,BHJ,optimized,morphology,vertical,component,distribution,was,achieved,processed,synergistic,effect,swelling,films,using,additive,Such,strategy,involves,chlorobenzene,first,processing,solvent,chloroform,second,trace,efficiently,promoting,exciton,dissociation,charge,extraction,reducing,trap,assisted,recombination,Consequently,over,fabricated,method,realized,which,much,higher,than,that,its,counterpart,also,among,highest,PCEs,We,further,demonstrated,generality,this,approach,various,systems,This,work,indicates,can,yield,provides,facile,fabricating,performance

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