The environmentally friendly Cu2ZnSn(S,Se)4(CZTSSe)compounds are promising direct bandgap materi-als for application in thin film solar cells,but the spontaneous surface defects disordering would lead to large open-circuit voltage deficit(Voc,deficit)and significantly limit kesterite photovoltaics performance,primarily arising from the generated more recombination centers and insufficient p to n conversion at p-n junction.Herein,we establish a surface defects ordering structure in CZTSSe system via local substi-tution of Cu by Ag to suppress disordered CuZn defects and generate benign n-type ZnAg donors.Taking advantage of the decreased annealing temperature of AgF post deposition treatment(PDT),the high con-centration of Ag incorporated into surface absorber facilitates the formation of surface ordered defect environment similar to that of efficient CIGS PV.The manipulation of highly doped surface structure could effectively reduce recombination centers,increase depletion region width and enlarge the band bending near p-n junction.As a result,the AgF-PDT device finally achieves maximum efficiency of 12.34％with enhanced Voc of 0.496 V.These results offer a new solution route in surface defects and energy-level engineering,and open the way to build up high quality p-n junction for future development of kesterite technology.

Changcheng Cui;Dongxing Kou;Wenhui Zhou;Zhengji Zhou;Shengjie Yuan;Yafang Qi;Zhi Zheng;Sixin Wu

Key Lab for Special Functional Materials,Ministry of Education,National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology,School of Materials Science and Engineering,Collaborative Innovation Center of Nano Functional Materials and Applications,Henan University,Kaifeng 475004,Henan,China;Inst Surface Micro&Nano Mat,Coll Adv Mat&Energy,Key Lab Micronano Energy Storage&Convers Mat He,Xuchang University,Xuchang 461000,Henan,China

能源化学

[1]Changcheng Cui;Dongxing Kou;Wenhui Zhou;Zhengji Zhou;Shengjie Yuan;Yafang Qi;Zhi Zheng;Sixin Wu-.Surface defect ordered Cu2ZnSn(S,Se)4 solar cells with efficiency over 12％via manipulating local substitution)[J].能源化学,2022(04):555-562

ZnAg,AgF

Surface,Cu2ZnSn,solar,cells,efficiency,over,via,manipulating,local,substitution,environmentally,friendly,CZTSSe,compounds,are,promising,direct,bandgap,materi,als,application,thin,film,but,spontaneous,surface,defects,disordering,would,lead,open,circuit,voltage,deficit,Voc,significantly,limit,kesterite,photovoltaics,performance,primarily,arising,from,generated,more,recombination,centers,insufficient,conversion,junction,Herein,we,establish,structure,system,by,suppress,disordered,CuZn,benign,type,donors,Taking,advantage,decreased,annealing,temperature,post,deposition,treatment,PDT,centration,incorporated,into,absorber,facilitates,formation,similar,that,efficient,CIGS,PV,manipulation,highly,doped,could,effectively,reduce,increase,depletion,region,width,enlarge,bending,near,device,finally,achieves,maximum,enhanced,These,results,offer,new,solution,route,energy,level,engineering,way,build,quality,future,development,technology

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