PbI_6 Octahedra Stabilization Strategy Based on π-π Stacking Small Molecule Toward Highly Efficient and Stable Perovskite Solar Cells

Xianzhao Wang; Dachang Liu; Ruichen LiuXiaofan DuBingqian ZhangXiuhong SunChen ChenZhipeng LiQiangqiang ZhaoZhipeng ShaoXiao WangGuanglei CuiShuping Pang

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PbI_6 Octahedra Stabilization Strategy Based on π-π Stacking Small Molecule Toward Highly Efficient and Stable Perovskite Solar Cells

机译：PbI_6 Octahedra Stabilization Strategy Based on π-π Stacking Small Molecule Toward Highly Efficient and Stable Perovskite Solar Cells

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The unavoidable iodine loss in the perovskite layer is closely related to carriernon-radiative and device degradation. During the post-annealing process,the fragile Pb-I bond is easy to break, leading to the formation of iodinevacancies and inducing stress-driven structure collapse. Herein, a PbI_6octahedra stabilization strategy via building robust grain boundary modificationnetworks is developed. The introduction of conjugated structure intoamides can significantly enhance their anchoring ability with Pb-Ⅰ units,while the π–π stacking effect of benzamide enables a passivation networkwith polymer-like effect. This is well evidenced by the excellent properties ineliminated iodine loss and stabilized perovskite lattice. Therefore, benzamidemodification not only transform the perovskite films from n-type to p-type bysuppressing the iodine vacancy-doping effect, but also reduces defect density,ultimately bringing the perovskite layer longer carrier diffusion length andbetter charge injection efficiency. Finally, the benzamide modified devicesrealize both high power conversion efficiency of 24.78% and excellent operatingstability. Of particular note, the module efficiency with 14 cm~2 activearea is over 21%.

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来源
《Advanced energy materials》 |2023年第11期|2203635.1-2203635.8|共8页
作者
Xianzhao Wang; Dachang Liu; Ruichen LiuXiaofan DuBingqian ZhangXiuhong SunChen ChenZhipeng LiQiangqiang ZhaoZhipeng ShaoXiao WangGuanglei CuiShuping Pang;
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作者单位

Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101, P. R. China,Shandong Energy InstituteQingdao 266101, P. R. China,Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of;

Key Laboratory for Green Chemical Technology of Ministry of EducationSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072, P. R. China;

Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101, P. R. China,Shandong Energy InstituteQingdao 266101, P. R. ChinaQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101, P. R. China;

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正文语种英语
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energy levels; iodine loss; ion migration; stability; π-π stacking;

PbI_6 Octahedra Stabilization Strategy Based on π-π Stacking Small Molecule Toward Highly Efficient and Stable Perovskite Solar Cells

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