Optical spectroscopy of single perovskite nanocrystals for quantum photonics
Lead halide perovskites in their nanocrystal form have recently emerged as efficient quantum light emitters despite their low-temperature colloidal synthesis and structural lability. This has led to an intense debate about the band-edge exciton in these materials and the bright or dark character...
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| Format: | Thesis-Doctor of Philosophy |
| Language: | English |
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Nanyang Technological University
2023
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| Online Access: | https://hdl.handle.net/10356/164568 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Lead halide perovskites in their nanocrystal form have recently emerged as efficient quantum
light emitters despite their low-temperature colloidal synthesis and structural lability. This has
led to an intense debate about the band-edge exciton in these materials and the bright or dark
character of the lowest energy exciton state. While symmetry arguments predict a lowest-lying
dark exciton state, it was hypothesised that the combination of strong-spin orbit and structural
instability should lead to a Rashba effect which places the bright exciton state below the dark
exciton, in contrast with all other established materials. This work is a detailed study of single
CsPbBr3, in the spectral and time domain, which provides critical information about the
band-edge exciton fine structure. It should help the community refine theoretical models and
converge towards an accurate description of the band-edge exciton of these fledgling materials,
thus helping to shed light on their outstanding properties. |
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