Synthesis, Structure and Photoluminescent Properties of Perovskite - Hybrid Glass Composites

金属卤化物钙钛矿具有优异的性能，在下一代光电器件如发光二极管和光伏器件的开发中具有广阔的前景。但是，它们的相位不稳定性和外部环境的退化阻碍了它们的广泛实施。在室温下，功能相不是最稳定的热力学相，因此期望的光学性质只能在转换成伪立方“黑”相后才能获得。纳米工程和利用表面能和应变的创新已经成功地实现了黑相稳定。研究人员最近成功地将钙钛矿CsPbI3封装在金属有机框架（MOF）， ZIF-6ti玻璃中，以保持活性黑色相，并在溶剂，水分和光线下表现出出色的稳定性。复合材料的优异性能归因于钙钛矿-玻璃界面处强烈的界面相互作用。鉴于这些令人鼓舞的结果，拟议的博士项目旨在将MOF玻璃封装扩展到无机-有机钙钛矿，FAPbI3 （FA = formadinium）。该项目旨在发现一套适合FAPbI3钙钛矿的玻璃基质，以实现黑相稳定。由于界面相互作用的重要性，该项目的一个显著特征是采用先进的表征来探测非晶材料的纳米级结构。x射线对分布函数（PDF）将用于分析整体结构，而扫描电子PDF提供的空间分辨率将有助于探测局部结构。随后，将通过光致发光和电子带隙测量来测量功能发光特性，并探索器件制造的潜力。综上所述，这些研究将为纳米工程钙钛矿界面提供前所未有的理解，并改善光电性能，为推进钙钛矿器件的下一个时代打开大门。

Metal halide perovskites possess remarkable properties promising for the development of next generation optoelectronic devices, such as light-emitting diodes and photovoltaics. However, their widespread implementation is hindered by their phase instability and degradation from the external environment. At room temperature, the functional phase is not the most thermodynamically stable, and thus the desired optical properties can only be obtained upon conversion into the pseudo-cubic 'black' phase. Innovations in nanoengineering and exploiting surface energy energies and strains have successfully achieved black phase stabilisation. Researchers have recently successfully encapsulated the perovskite CsPbI3 in the metal-organic framework (MOF), ZIF-6ti glass to preserve the active black phase and exhibit outstanding stability in solvents, moisture, and light. The excellent performance of the composite is attributed to the strong interfacial interactions at the perovskite-glass interface. Given these encouraging outcomes, the proposed PhD project aims to extend MOF glass encapsulation to hybrid inorganic-organic perovskites, FAPbI3 (FA = formadinium). The proposed project aims to discover a suite of suitable glass matrices for FAPbI3 perovskite to achieve black phase stabilisation. Owing to the significance of the interfacial interactions, a distinguishing feature of the project is to employ advanced characterisation to probe the nanoscale structure of amorphous materials. X-ray pair distribution function (PDF) will be used to analyse the bulk structure, whilst spatial resolution offered from scanning electron PDF will be instrumental in probing the local structure. Subsequently, the functional luminescent properties will be measured with photoluminescence and electronic band gap measurements, as well as exploring the potential for device fabrication. In combination, these studies will offer an unprecedented understanding of nanoengineering perovskite interfaces with improved optoelectronic properties, opening doors for advancing the next era of perovskite devices.