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dc.contributor.authorRivett, Jasmine Pamela Helen
dc.date.accessioned2018-04-23T08:31:51Z
dc.date.available2018-04-23T08:31:51Z
dc.date.issued2018-05-19
dc.date.submitted2017-12-01
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/275095
dc.description.abstractIn this thesis, we investigate the nature of charge carrier generation, relaxation and recombination in a range of lead halide perovskites. We focus on understanding whether the photophysical behaviour of these perovskite materials is like that of highly-ordered inorganic crystalline semiconductors (exhibiting ballistic charge transport) or disordered molecular semiconductors (exhibiting strong electron-phonon coupling and highly localised excited states) and how we can tune these photophysical properties with inorganic and organic additives. We find that the fundamental photophysical properties of lead halide perovskites, such as charge carrier relaxation and recombination, arise from the lead halide lattice rather than the choice of A-site cation. We show that while the choice of A-site cation does not affect these photophysical properties directly, it can have a significant impact on the structure of the lead halide lattice and therefore affect these photophysical properties indirectly. We demonstrate that lead halide perovskites fabricated from particular inorganic and organic A-site cation combinations exhibit low parasitic trap densities and enhanced carrier interactions. Furthering our understanding of how the photophysical properties of these materials can be controlled through chemical composition is extremely important for the future design of highly efficient solar cells and light emitting diodes.
dc.description.sponsorshipThis work was supported by the EPSRC Cambridge NanoDTC, EP/G037221/1.
dc.language.isoen
dc.rightsAll rights reserved
dc.subjectLead halide perovskite
dc.subjectUltrafast spectroscopy
dc.subjectSemiconductor
dc.subjectPerovskite
dc.subjectLaser spectroscopy
dc.subjectFemtosecond spectroscopy
dc.subjectCharge carrier relaxation
dc.subjectPolarisation anisotropy
dc.subjectPump-probe
dc.subjectTransient absorption
dc.titleCharge Carrier Dynamics of Lead Halide Perovskites Probed with Ultrafast Spectroscopy
dc.typeThesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnameDoctor of Philosophy (PhD)
dc.publisher.institutionUniversity of Cambridge
dc.publisher.departmentPhysics
dc.date.updated2018-04-21T11:32:36Z
dc.identifier.doi10.17863/CAM.22275
dc.publisher.collegeChurchill
dc.type.qualificationtitlePhD in Physics
cam.supervisorCredgington, Dan
cam.supervisorDeschler, Felix
cam.supervisorCheetham, Anthony
cam.thesis.fundingtrue
rioxxterms.freetoread.startdate2019-04-23


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