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Multi-Stage Phase-Segregation of Mixed Halide Perovskites under Illumination: A Quantitative Comparison of Experimental Observations and Thermodynamic Models

机译:Multi-Stage Phase-Segregation of Mixed Halide Perovskites under Illumination: A Quantitative Comparison of Experimental Observations and Thermodynamic Models

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摘要

Photo- and charge-carrier-induced ion migration is a major challengewhen utilizing metal halide perovskite semiconductors for optoelectronicapplications. For mixed iodide/bromide perovskites, the compositionalinstability due to light- or electrical bias induced phase-segregation restrictsthe exploitation of the entire bandgap range. Previous experimental andtheoretical work suggests that excited states or charge carriers trigger theprocess, but the exact mechanism is still under debate. To identify themechanism and cause of light-induced phase-segregation phenomena, thefull compositional range of methylammonium lead bromide/iodide samplesare investigated, MAPb(Br_xI_(1-x))_3 with x = 0…1, by simultaneous in situ X-raydiffraction (XRD) and photoluminescence (PL) spectroscopy during illumination.The quantitative comparison of composition-dependent in situ XRDand PL shows that at excitation densities of 1 sun, only the initial stageof photo-segregation is rationalized with the previously established thermodynamicmodels. However, a progression of the phase segregation isobserved that is rationalized by considering long-lived accumulative photoinducedmaterial alterations. It is suggested that (additional) photo-induceddefects, possibly halide vacancies and interstitials, need to be considered tofully rationalize light-induced phase segregation and anticipate the findingsto provide crucial insight for the development of more sophisticatedmodels.

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  • 来源
    《Advanced functional materials》 |2023年第3期|2206047.1-2206047.14|共14页
  • 作者单位

    Division of Chemical Physics and NanoLundLund UniversityPO Box 124, 22100 Lund, Sweden;

    MAX IV LaboratoryLund UniversityPO Box 118, 22100 Lund, Sweden;

    Structure and Dynamics of Energy MaterialsHelmholtz-Zentrum Berlin fuer Materialien und Energie GmbHHahn-Meitner-Platz 1, 14109 Berlin, Germany, Microstructure and Residual Stress AnalysisHelmholtz-Zentrum Berlin fuer Materialien und Energie GmbHAlbert-EiDepartment Solution-Processing of Hybrid Materials and DevicesHelmholtz-Zentrum Berlin fuer Materialien und Energie GmbHKekulestrasse 5, 12489 Berlin, Germany, Research Group Hybrid Materials: Formation and ScalingHumboldt Universitaet zu BerlinIRIS AdlerDepartment Solution-Processing of Hybrid Materials and DevicesHelmholtz-Zentrum Berlin fuer Materialien und Energie GmbHKekulestrasse 5, 12489 Berlin, GermanyMicrostructure and Residual Stress AnalysisHelmholtz-Zentrum Berlin fuer Materialien und Energie GmbHAlbert-Einstein-Strasse 15, 12489 Berlin, GermanyDivision of Chemical Physics and NanoLundLund UniversityPO Box 124, 22100 Lund, Sweden, Department Solution-Processing of Hybrid Materials and DevicesHelmholtz-Zentrum Berlin fuer Materialien und Energie GmbHKekulestrasse 5, 12489 Berlin, Germany, Researc;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类
  • 关键词

    in-situ X-ray diffraction; light-induced phase-segregations; metal-halide perovskites; multimodal experiments;

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