Investigation of phonon dynamic in single crystal lead-halide perovskites by inelastic neutron scattering

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dc.contributor.authorDubajic, Men_AU
dc.contributor.authorWang, Den_AU
dc.contributor.authorMahmud, Aen_AU
dc.contributor.authorUpama, Men_AU
dc.contributor.authorJia, Xen_AU
dc.contributor.authorRule, KCen_AU
dc.contributor.authorSrestha, Sen_AU
dc.contributor.authorBremner, Sen_AU
dc.contributor.authorConibeer, Gen_AU
dc.date.accessioned2023-11-21T04:02:47Zen_AU
dc.date.available2023-11-21T04:02:47Zen_AU
dc.date.issued2018-11-19en_AU
dc.date.statistics2023-05-23en_AU
dc.description.abstractThe lead halide perovskite materials have recently risen to prominence for remarkably high photovoltaic efficiencies in polycrystalline materials that are highly defected [1] Some of the reasons for this good defect tolerance are the very low exciton binding energy and consequent highly de localized electrons and holes leading to high mobilities in these materials, coupled to low thermal conductance. Other recent work by our group has shown long lifetimes for hot carriers in a range of perovskites with organic lead iodide perovskites having the longest lifetimes [2]. In order to explain those rather promising physical properties, a closer investigation of phonon dynamics is needed. Al though ab initio simulations (DFT) can predict phonon dispersions to a reasonably accurate extent (comparison between different phonon modes) [2, 3], scaling their energies to actual phonon energies (particularly at high momenta near the zone edge) can be rather inaccurate. In order to obtain a detailed phonon dispersion to overcome the limits of the ab initio methods, scattering techniques can be used (as they offer full Brillouin zone mapping and are suitable for large single crystal samples). The thermal triple axis spectrometer (TAS) on TAIPAN at OPAL reactor at ANSTO was used with the aim to map phonon dispersion of single crystal Methyl Ammonium Lead Halide Perovskites, CH3NH3PbBr3 and CH3NH3PbI3 [4]. The alignment was performed so that we could scan through [h k l] and [ 0 k l] planes in reciprocal space for MAPbBr3 and MAPbI3 samples, respectively. Assuming the cubic space group, ABX3, for the MAPbBr3 sample, we were able to perform transverse and longitudinal scans along each high symmetry direction in the Brillouin zone (Г-X and Г-M) which would ensure the mapping of all phonon modes in the h k plane of the Brillouin zone. The full phonon dispersions that will be obtained with this method can be of great significance as by adding up to the already simulated data we will be able to have a deeper insight into the undergoing physics that is responsible for the previously observed properties (such as significantly extended hot carrier lifetimes) where phonon dynamics will play a significant role. © 2018 The Authors.en_AU
dc.identifier.citationDubajic. M., Wang, D., Mahmud, A., Upama, M., Jia, X., Rule, K., Srestha, S., Bremner, S., & Conibeer, G. (2018). Investigation of phonon dynamic in single crystal lead-halide perovskites by inelastic neutron scattering. Paper presented to the ANBUG-AINSE Neutron Scattering Symposium, AANSS 2018, 19 - 21 November 2018, Sydney, Australia, (pp. 2 - 3). Retrieved from https://events01.synchrotron.org.au/event/84/book-of-abstracts.pdfen_AU
dc.identifier.conferenceenddate2018-11-21en_AU
dc.identifier.conferencenameANBUG-AINSE Neutron Scattering Symposium, AANSS 2018en_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate2018-11-19en_AU
dc.identifier.pagination2-3en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15217en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineering (AINSE)en_AU
dc.relation.urihttps://events01.synchrotron.org.au/event/84/book-of-abstracts.pdfen_AU
dc.subjectANSTOen_AU
dc.subjectOPAL Reactoren_AU
dc.subjectMaterialsen_AU
dc.subjectLead iodideen_AU
dc.subjectSpectrometersen_AU
dc.subjectMonocrystalsen_AU
dc.subjectBrillouin zonesen_AU
dc.subjectEnergyen_AU
dc.subjectScatteringen_AU
dc.titleInvestigation of phonon dynamic in single crystal lead-halide perovskites by inelastic neutron scatteringen_AU
dc.typeConference Abstracten_AU
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