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Photobrightening in Lead Halide Perovskites: Observations, Mechanisms, and Future Potential

机译：卤化钙钛矿中的光致发光：观察，机制和未来的潜力。

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摘要

There has been a meteoric rise in the commercial potential of lead halide perovskite optoelectronic devices since photovoltaic cells and light-emitting diodes based on these materials were first demonstrated. One key challenge common to each of these optoelectronic devices is the need to suppress nonradiative recombination, a process that limits the maximum achievable efficiency in photovoltaic cells and light-emitting diodes. In this Progress Report, recent studies that seek to minimize this loss pathway in perovskites through a photobrightening treatment, whereby the luminescence efficiency is enhanced through a light illumination passivation process are examined. The sensitivity of this effect to various experimental considerations is examined, including atmosphere, photon energy, photon dose, and also the role of perovskite composition and morphology; under certain conditions there can even be photodarkening effects. Consideration of these factors is critical to resolve seemingly conflicting literature reports. Proposed mechanisms are scrutinized, revealing that there is now some consensus but further work is needed to identify the specific defects being passivated and elucidate universal mechanisms. Finally, the prospects for these treatments to minimize halide migration and push the properties of polycrystalline films towards those of their single-crystal counterparts are discussed.
机译：自从首次证明了基于这些材料的光伏电池和发光二极管以来，卤化钙钛矿铅光电器件的商业潜力就出现了巨大的增长。这些光电器件中每一个的共同主要挑战是抑制无辐射复合的需要，该过程限制了光伏电池和发光二极管中可达到的最大效率。在此进展报告中，研究了最近的研究，这些研究试图通过光亮处理使钙钛矿中的这种损失途径最小化，从而通过光钝化过程提高发光效率。研究了这种效应对各种实验因素的敏感性，包括大气，光子能量，光子剂量，以及钙钛矿成分和形态的作用;在某些条件下，甚至可能出现光暗化效果。考虑这些因素对于解决看似矛盾的文献报告至关重要。对拟议的机制进行了仔细检查，发现目前已达成共识，但还需要进一步的工作来确定被钝化的特定缺陷并阐明通用机制。最后，讨论了将卤化物的迁移减至最小并使多晶膜的性能朝着其单晶对应物的方向发展的前景。

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  • 来源
    《Advanced energy materials》 |2020年第13期|1903109.1-1903109.12|共12页
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  • 作者单位

    Univ Cambridge Dept Phys Cavendish Lab JJ Thomson Ave Cambridge CB3 OHE England;

    Univ Cambridge Dept Phys Cavendish Lab JJ Thomson Ave Cambridge CB3 OHE England|Univ Cambridge Dept Chem Engn & Biotechnol Philippa Fawcett Dr Cambridge CB3 0AS England;

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  • 正文语种 eng
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  • 关键词

    luminescence; passivation; perovskite; photobrightening; recombination;

    机译：发光钝化钙钛矿光亮重组;

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