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Tailoring component incorporation for homogenized perovskite solar cells

Science Bulletin 2024年第16期69卷 2555-2564页

作者： Wenhan Yang Junmin Xia Yuexin Lin Hao Gu Fengqiang Ma Yumin Ren Fenqi Du Dejian Yu Jinfeng Liao Yiwang Chen Guojia Fang Shengchun Yang Chao Liang MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&TelecommunicationsNanjing 210023China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao 999078China Shandong Zhixin Intelligent Equipment Co. LTDJinan 250101China School of Chemistry Xi’an Jiaotong UniversityXi’an 710049China National Engineering Research Center for Carbohydrate Synthesis Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationJiangxi Normal UniversityNanchang 330022China Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China

Deep-level traps at the buried interface of perovskite and energy mismatch problems between the perovskite layer and heterogeneous interfaces restrict the development of ideal homogenized films and efficient perovskite solar cells(PSCs)using the one-step spin-coating ***,we strategically employed sparingly soluble germanium iodide as a homogenized bulk in-situ reconstruction inducing material preferentially aggregated at the perovskite buried interface with gradient doping,markedly reducing deep-level traps and withstanding local lattice strain,while minimizing non-radiative recombination losses and enhancing the charge carrier lifetime over 9μ***,this gradient doping assisted in modifying the band diagram at the buried interface into a desirable flattened alignment,substantially mitigating the energy loss of charge carriers within perovskite films and improving the carrier extraction *** a result,the optimized device achieved a champion power conversion efficiency of 25.24% with a fill factor of up to 84.65%,and the unencapsulated device also demonstrated excellent light stability and humidity *** work provides a straightforward and reliable homogenization strategy of perovskite components for obtaining efficient and stable PSCs.

关键词： homogenized perovskite films Lattice strain relaxation Deep-level traps Carrier extraction equilibrium perovskite solar cells

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