Design and synthesis of low bandgap (LBG) polymer donors is inevitably challenging and their process-ability from a non-halogenated solvent system remains a hurdle to overcome in the area of high-performance polymer solar cells (PSCs),Due to a high aggregation tendency of LBG polymers,especially diketopyrrolopyrrole (DPP)-based polymers coupled with bithiophenes in the polymer backbones,their widespread adoption in non-halogenated solvent-processed PSCs has been limited.Herein,a novel LBG DPP-based polymer,called PDPP4T-1F with asymmetric arrangement of fluorine atom,has been success-fully synthesized and showed an outstanding power conversion efficiency (PCE) of 10.10％ in a single-junction fullerene-based PSCs.Furthermore,an impressive PCE of 13.21％ has been achieved in a tandem device from a fully non-halogenated solvent system,which integrates a wide bandgap PDTBTBz-2F poly-mer in the bottom cell and LBG PDPP4T-1F polymer in the top cell.The achieved efficiency is the highest value reported in the literature to date in fullerene-based tandem PSCs.We found that a uniformly dis-tributed interpenetrating fibril network with nano-scale phase separation and anisotropy of the polymer backbone orientation for efficient charge transfer/transport and suppressed charge recombination in PDPP4T-1 F-based PSCs led to outstanding PCEs in single and tandem-junction PSCs.

Shafket Rasool;Quoc Viet Hoang;Doan Van Vu;Chang Eun Song;Hang Ken Lee;Sang Kyu Lee;Jong-Cheol Lee;Sang-Jin Moon;Won Suk Shin

Energy Materials Research Center,Korea Research Institute of Chemical Technology (KRICT),141 Gajeong-ro,Yuseong,Daejeon 34114,Republic of Korea;Advanced Materials and Chemical Engineering,University of Science and Technology (UST),217 Gajeongro,Yuseong,Daejeon 34113,Republic of Korea;Vietnam Standards and Quality Institute (VSQI),Directorate for Standards,Metrology and Quality (STAMEQ),No.8,Hoang Quoc Viet,Cau Giay,Hanoi,Viet Nam

能源化学

[1]Shafket Rasool;Quoc Viet Hoang;Doan Van Vu;Chang Eun Song;Hang Ken Lee;Sang Kyu Lee;Jong-Cheol Lee;Sang-Jin Moon;Won Suk Shin-.High-efficiency single and tandem fullerene solar cells with asymmetric monofluorinated diketopyrrolopyrrole-based polymer)[J].能源化学,2022(01):236-245

monofluorinated,diketopyrrolopyrrole,bithiophenes,PDPP4T,PDTBTBz

High,efficiency,single,tandem,fullerene,solar,cells,asymmetric,Design,synthesis,low,bandgap,LBG,donors,inevitably,challenging,their,ability,from,halogenated,solvent,system,remains,hurdle,overcome,area,performance,PSCs,Due,aggregation,tendency,polymers,especially,coupled,backbones,widespread,adoption,processed,been,limited,Herein,novel,called,1F,arrangement,fluorine,atom,success,fully,synthesized,showed,outstanding,power,conversion,junction,Furthermore,impressive,achieved,device,which,integrates,2F,bottom,highest,value,reported,literature,date,We,found,that,uniformly,dis,tributed,interpenetrating,fibril,network,nano,scale,phase,separation,anisotropy,orientation,efficient,charge,transfer,transport,suppressed,recombination,PCEs

0.460949