Quantum-confined Inorganic-organic Lead Halide Perovskite

Inorganic-organic hybrid perovskites have been regarded as one of the most distinctive next-generation luminescence materials due to their advanced properties. This thesis describes our study of confining inorganic-organic hybrid perovskites with nanoporous gallium nitride (GaN) matrix and with polyaromatic hydrocarbon compounds. We demonstrate a solution-processed method for infiltrating methylammonium lead bromide perovskite (MAPbBr3) into the nanoporous GaN matrix. The GaN matrix prevents perovskite from light-induced degradation for five hours in the ambient atmosphere, and perovskite was stable after one-year storage in the ambient atmosphere. We found that our infiltration method can be generalised to related perovskite materials, offering a route to producing composites of interest for use in optoelectronic devices for various applications. We then investigate the confinement effect of the nanoporous GaN on MAPbBr3 perovskite via transient photoluminescence and transient absorption characterisation. The spatial confinement leads to enhanced charge carriers interaction, revealing as a blue shift in photoluminescence and a faster radiative recombination process for MAPbBr3 perovskite inside nanopores. Due to the size distribution of MAPbBr3 nanocrystals inside nanopores, a transfer from high energy state to low energy state happens between perovskite nanocrystals. Finally, we demonstrate a solution-processed method to synthesis two-dimensional (2D) perovskite thin films with 2,6-dimethylammoniumnaphthalene (DMAN) and bis(propargyl ammonium iodide) anthracene (BPAIA) separately. We successfully v synthesised DMAN lead iodide perovskite and BPAIA lead iodide perovskite. The characterisation demonstrates that the synthesised BPAIA perovskite is not phase pure. The molecule modelling suggests a large repulsion between BPAIA compounds exists in the organic spacer layer of the 2D perovskite, resulting in the photoluminescence broadening. The DMAN lead iodide perovskite shows a structural character of the Dion-Jacobson perovskite and its strong excitonic character, making it a candidate for lighting applications

Name dc:type.qualificationname

Doctor of Philosophy (PhD)

Level dc:type.qualificationlevel

Doctoral

Grantor dc:publisher.institution

University of Cambridge

Year dc:date.issued

2021

Author dc:creator

• Bai, Xinyu

Advisor dc:contributor.advisor

• Friend, Richard

• perovskite
• GaN

Licence

• https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/0b9a1383-2b6d-4060-994a-7049b0111e8a/download
• https://www.rioxx.net/licenses/all-rights-reserved/

Language dc:language

eng

Author Identifier

0000-0001-6565-6308

OAI identifier oai:identifier

oai:www.repository.cam.ac.uk:1810/329632