E-Thesis 39 views 14 downloads
Photochemical Characterisation of Perovskites to Inform Stability and Sustainability / ALEXANDER DOOLIN
Swansea University Author: ALEXANDER DOOLIN
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PDF | E-Thesis – open access
Copyright: The Author, Alexander James Doolin, 2023 Distributed under the terms of a Creative Commons Attribution 4.0 License (CC BY 4.0).
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DOI (Published version): 10.23889/SUThesis.69264
Abstract
This thesis utilises photochemical characterisation techniques, along with morphological measurements, to study perovskite thin films deposited from a range of alternative solvent systems and anti-solvent combinations. This work aims to enlighten the process of judicious solvent selection with a vie...
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Swansea University, Wales, UK
2025
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| Institution: | Swansea University |
| Degree level: | Doctoral |
| Degree name: | Ph.D |
| Supervisor: | Davies, M. L., and Carnie, M. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa69264 |
| Abstract: |
This thesis utilises photochemical characterisation techniques, along with morphological measurements, to study perovskite thin films deposited from a range of alternative solvent systems and anti-solvent combinations. This work aims to enlighten the process of judicious solvent selection with a view to improving the stability of the rapidly evolving perovskite technology whilst simultaneously considering the ‘green’ credentials of the chemicals used. Through increased understanding of solvent contribution towards film properties, it is possible to reduce the environmental and health and safety burden of new emerging materials and shed light on the interplay between crystallisation kinetics and intrinsic film stability.Chapter 1 aims to provide a review of literature serving as a backdrop for the analysis considered within this thesis. Solvent parameters and their respective impact on film photoluminescence, morphology, and the stability of theprecursor solution are considered within this chapter. The development of a ‘green’ solvent toolkit, proposing multiple new chemicals for use within perovskite development is a crucial aim of this work.The following Chapter 2 focusses on the optimisation of experimental MAPbI3 perovskite precursor solutions. The goal here was to utilise a novel solvent formulation to achieve power conversion efficiencies comparable to that of the best performing solvents.Chapter 3 aims to improve the shelf life of the precursor through the introduction of novel anhydrous ‘green’ solvent additives – dimethyl carbonate. The long-term stability of MAPbI3 films and devices was considered within this chapter with a view to increasing sample stability through solvent parameter manipulation.Finally, Chapter 4 moves towards inherently more stable perovskite compositions – triple cation perovskite. The newly developed solvent systems and anti-solvent were trialled against this more complex composition. Devices with significant PCE% retention were evaluated over a 7-month period highlighting the potential for engineered planar perovskite architecture as the research field progresses. |
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| Keywords: |
Perovskites, Photochemistry, Sustainable Solvents |
| College: |
Faculty of Science and Engineering |
| Funders: |
EPSRC, FSE |