Bhatt, Prajna Vijay;
(2025)
Single Crystal Growth of Halide Perovskites in Silica Gel.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Halide perovskites and its derivatives are well known for their potential applications in photovoltaics. However, for optimisation in devices, structure-property relations must be studied systematically. As such, single crystals are champion forms of compounds that are able to study the surfaces, crystallographically specific directions and bulk compositions of materials. This Thesis explores a new synthesis method, called counter diffusion crystal growth (CDCG) for single crystal growth of various halide perovskites. The CDCG process and single crystals of the form ABX3 , A2BX6 and A3B2X9 have been studied. The ability to understand the products of CDCG has been shown here for the first time. Various structure-property relations for different perovskite and their related forms show the utility of single crystals for intrinsic materials studies. The organisation of the Thesis is as follows: Chapter 1 introduces the historical work on CDCG as well as the research within the halide perovskite field, highlighting the scope of this method for these materials. Chapter 2 details the experimental and analytical techniques used for experiments conducted for this Thesis. Chapter 3 explores the diffusion of halide salts within silica gels and proposes a model for the prediction of CDCG experiments. Chapters 4 and 5 used these models to synthesise a variety of complex perovskite single crystals. Surface, bulk and orientation studies uncovered crystallographic, chemical and electronic structures. The crystals were studied with a range of analytical techniques, from which new data analysis methods were introduced. Chapter 6 investigates the concept of surface passivation on single crystals which is often misunderstood in the field. Chapter 7 summarises all findings.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Single Crystal Growth of Halide Perovskites in Silica Gel |
| Language: | English |
| Additional information: | Copyright © The Author 2025. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10205164 |
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