Stable High-Efficiency CsPbI2Br Solar Cells by Designed Passivation Using Multifunctional 2D Perovskite

Jie Xu; Jian Cui; Shaomin YangZhike LiuXi GuoYuhang CheDongfang XuWenjing ZhaoNingyi YuanJianning DingShengzhong (Frank) Liu

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Stable High-Efficiency CsPbI2Br Solar Cells by Designed Passivation Using Multifunctional 2D Perovskite

机译：Stable High-Efficiency CsPbI2Br Solar Cells by Designed Passivation Using Multifunctional 2D Perovskite

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CsPbI_2Br perovskite is known for its advantages over its organic-inorganichybrid counterpart including better thermal stability and appropriate bandgapfor the front sub-cell of tandem solar cell. However, its lower-than-satisfactoryefficiency, problematic phase stability and sensitivity to moisture hinder itsfurther advancement. Here, three kinds of glycine halides (Gly-X: X = Cl, Br,and I) are strategically deigned to improve the performance of CsPbI2Br perovskitesolar cells (PSCs). Systematic experimental and calculated results provethat a 2D/3D hybrid structure is formed, wherein the Gly-X-based 2D perovskiteis mainly located at the CsPbI_2Br grain boundaries, and the A-sites ofthe 2D perovskite form strong bonds with the 3D perovskite to suppress ionmigration by increasing its activation energy. As a result, a power conversionefficiency (PCE) of 17.26% was obtained with an open-circuit voltage (VOC) of1.33 V, which is among the best PCE values for the CsPbI2Br PSCs. In addition,the efficiency of encapsulated device decrease only by 14.1% after 340 hcontinuous illumination in ambient conditions, representing one of the moststableinorganic PSCs reported so far. This work provides important insightsinto designing passivating agents to address the issue of phase segregationfor the development of highly stable perovskite optoelectronic devices.

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来源
《Advanced functional materials》 |2022年第33期|2202829.1-2202829.10|共10页
作者
Jie Xu; Jian Cui; Shaomin YangZhike LiuXi GuoYuhang CheDongfang XuWenjing ZhaoNingyi YuanJianning DingShengzhong (Frank) Liu;
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作者单位

Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education,Shaanxi Key Laboratory for Advanced EnergyDevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 7;

School of Materials Science and Engineering Jiangsu CollaborativeInnovation Center of Photovoltaic Science and Engineering JiangsuProvince Cultivation Base for State Key Laboratory of PhotovoltaicScience and TechnologyChangzhou UniversityChangzhou 213164,;

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正文语种英语
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2D; CsPbI_2Br; grain boundaries; high efficiency; phase stability; suppress ion migration;

Stable High-Efficiency CsPbI2Br Solar Cells by Designed Passivation Using Multifunctional 2D Perovskite

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