Hole-transporting material (HTM) plays a paramount role in enhancing the photovltaic performance of perovskite solar cells (PSCs).Currently,the vast majority of these HTMs employed in PSCs are organic small molecules and polymers,yet the use of organic metal complexes in PSCs applications remains less explored.To date,most of reported HTMs require additional chemical additives (e.g.Li-TFSI,t-TBP)towards high performance,however,the introduction of additives decrease the PSCs device stability.Herein,an organic metal complex (Ni-TPA) is first developed as a dopant-free HTM applied in PSCs for its facile synthesis and efficient hole extract/transfer ability.Consequently,the dopant-free Ni-TPA-based device achieves a champion efficiency of 17.89％,which is superior to that of pristine Spiro-OMeTAD (14.25％).Furthermore,we introduce a double HTM layer with a graded energy bandgap con-taining a Ni-TPA layer and a CuSCN layer into PSCs,the non-encapsulated PSCs based on the Ni-TPA/CuSCN layers affords impressive efficiency up to 20.39％ and maintains 96％ of the initial PCE after 1ooo h at a relative humidity around 40％.The results have demonstrated that metal organic complexes represent a great promise for designing new dopant-free HTMs towards highly stable PSCs.

Tai Wu;Linqin Wang;Rongjun Zhao;Rongshan Zhuang;Kanghong Zhao;Gaoyuan Liu;Jing Huang;Licheng Sun;Yong Hua

Yunnan Key Laboratory for Micro/Nano Materials & Technology,International Joint Research Center for Optoelectronic and Energy Materials,School of Materials and Energy,Yunnan University,Kunming 650091,Yunnan,China;Center of Artificial Photosynthesis for Solar Fuels,School of Science,Westlake University,Hangzhou 310024,Zhejiang,China;Institute of Natural Sciences,Westlake Institute for Advanced Study,Hangzhou 310024,Zhejiang,China;Department of Applied Physics,KTH-Royal Institute of Technology,16440 Stockholm,Sweden

能源化学

[1]Tai Wu;Linqin Wang;Rongjun Zhao;Rongshan Zhuang;Kanghong Zhao;Gaoyuan Liu;Jing Huang;Licheng Sun;Yong Hua-.Highly stable perovskite solar cells with a novel Ni-based metal organic complex as dopant-free hole-transporting material)[J].能源化学,2022(02):312-318

photovltaic,1ooo

Highly,stable,perovskite,solar,cells,novel,metal,organic,dopant,free,hole,transporting,material,Hole,plays,paramount,role,enhancing,performance,PSCs,Currently,vast,majority,these,HTMs,employed,are,small,molecules,polymers,yet,use,complexes,applications,remains,less,explored,To,date,most,reported,require,additional,chemical,additives,Li,TFSI,TBP,towards,however,introduction,decrease,device,stability,Herein,TPA,first,developed,applied,its,facile,synthesis,efficient,extract,transfer,Consequently,achieves,champion,efficiency,which,superior,that,pristine,Spiro,OMeTAD,Furthermore,introduce,double,graded,energy,bandgap,con,taining,CuSCN,into,encapsulated,layers,affords,impressive,maintains,initial,PCE,after,relative,humidity,around,results,have,demonstrated,represent,great,promise,designing,new,highly

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