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

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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.