Exploration of Localised Excitons in Novel Energy-Relevant Materials

Lead Research Organisation: University of Cambridge
Department Name: Physics

Abstract

Understanding and controlling the presence of defects in semiconductors is critical to their successful development for energy relevant applications. This is true in traditional semiconductors, such as silicon, where high control of doping is central to function, and in new high performance semiconductors, such as perovskite, where high defect densities are formed from the solution processing. Defects can also produce new functionality, for example in wide bandgap semiconductors, where native defects lead to localised excitons that emit quantum light in the visible region. However, how defects affect electronic and optical behaviour of materials is not always clear, and as new energy materials emerge, it is important to understand how defects can be controlled and functionalised. This PhD project will explore the nature of localised excitons in a range of novel energy materials, with the goal of using the presence of defects to generate new quantum light sources. In particular, focus will be on novel halide perovskite architectures and 2D materials, systems where defects are known to exist but their properties remain to be fully understood. In the case of perovskite, defect tuning has so far been motivated by obtaining high power conversion efficiencies, but less has been explored with regards to obtaining quantum emission. This project will aim to determine the electronic and chemical structure of the emerging 2D single photon systems, with a particular focus on intrinsic and artificial strain-induced defects.

Publications

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Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/S022953/1 01/10/2019 31/03/2028
2276482 Studentship EP/S022953/1 01/10/2019 30/09/2023 Simone Eizagirre Barker