Metal halide perovskite-based solar cells(PSCs)have rapidly-increased power conversion efficiency(PCE)exceeding 25％but poor stability especially under ultraviolet(UV)light.Meanwhile,non-radiative recom-bination caused by diverse defects in perovskite absorbers and related interfaces is one of the major fac-tors confining further development of PSCs.In this study,we systematically investigate the role of 2-(2-hydroxy-5-methylphenyl)benzotriazole(UVP)additive in perovskite layers.By adjusting the amount of doped UVP,the quality of perovskite absorbers is significantly improved with enlarged grains,longer life-time and diffusion length of charge carriers.Furthermore,UVP not only reduces defects for less non-radiative recombination,but also matches energy level alignment for efficient interfacial charge extrac-tion.X-ray photoelectron spectroscopy confirms that N-donor of UVP molecule coordinates with under-coordinated Pb2+on the surface.Interestingly,UVP incorporated in PbI2 protects the perovskite by absorbing UV through the opening and closing of the chelating ring.Eventually,the UVP treated PSCs obtain a champion PCE of 22.46％with remarkably enhanced UV stability,retaining over 90％of initial PCE after 60 mW/cm2 strong UV irradiation for 9 h while the control maintaining only 74％.These results demonstrate a promising strategy fabricating passivated and UV-resistant perovskite materials simulta-neously for efficient and stable perovskite photovoltaics.

Jiale Li;Wenjing Qi;Yameng Li;Sumin Jiao;Hao Ling;Peng Wang;Xin Zhou;Khumal Sohail;Guangcai Wang;Guofu Hou;Jingshan Luo;Ying Zhao;Liming Ding;Yuelong Li;Xiaodan Zhang

Institute of Photoelectronic Thin Film Devices and Technology,Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin,Engineering Research Center of Thin Film Optoelectronics Technology(MoE),Nankai University,Tianjin 300350,China;College of Chemical and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China;Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China

能源化学

[1]Jiale Li;Wenjing Qi;Yameng Li;Sumin Jiao;Hao Ling;Peng Wang;Xin Zhou;Khumal Sohail;Guangcai Wang;Guofu Hou;Jingshan Luo;Ying Zhao;Liming Ding;Yuelong Li;Xiaodan Zhang-.UV light absorbers executing synergistic effects of passivating defects and improving photostability for efficient perovskite photovoltaics)[J].能源化学,2022(04):138-146

methylphenyl,Pb2+on

light,absorbers,executing,synergistic,effects,passivating,defects,improving,photostability,efficient,perovskite,photovoltaics,Metal,halide,solar,cells,PSCs,have,rapidly,increased,power,conversion,efficiency,PCE,exceeding,but,poor,especially,under,ultraviolet,Meanwhile,radiative,caused,by,diverse,related,interfaces,one,major,tors,confining,further,development,this,study,systematically,investigate,role,hydroxy,benzotriazole,UVP,additive,layers,By,adjusting,amount,doped,quality,significantly,improved,enlarged,grains,longer,life,diffusion,length,charge,carriers,Furthermore,not,only,reduces,less,recombination,also,matches,energy,level,alignment,interfacial,extrac,ray,photoelectron,spectroscopy,confirms,that,donor,molecule,coordinates,coordinated,surface,Interestingly,incorporated,PbI2,protects,absorbing,through,opening,closing,chelating,ring,Eventually,treated,obtain,champion,remarkably,enhanced,retaining,over,initial,after,mW,strong,irradiation,control,maintaining,These,results,demonstrate,promising,strategy,fabricating,passivated,resistant,materials,simulta,neously,stable

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