Lead-Free Perovskite Cs2CuBr4 Single Crystals: Synthesis and Properties

dc.contributor.advisor Wu, Tom Yao, Yuchen 2022-03-09T06:20:31Z 2022-03-09T06:20:31Z 2021
dc.description.abstract Lead-based perovskites have been one of the hottest research topics due to its excellent optoelectronic performance, such as outstanding absorption coefficients, tuneable bandgap≈1.6 eV, long carrier diffusion length, high defect tolerance, convenient solution processability, and good charge carrier mobility. It has been widely studied to be applied on solar cells, photodetector, and light emitting diode. However, there are still some challenges on widely applying lead halide perovskites: nature toxicity of lead, unreliability in moisture and light environment, poor stability to heat and oxygen, and the existed self-degradation pathway. To overcome these problems, we fabricated lead-free perovskites Cs2CuBr4 single crystals and characterized the perovskites from structure, optical properties, and electrical device performance. The solution-evaporated method was introduced to grow Cs2CuBr4 single crystals. The prepared perovskites exhibit 2D orthorhombic structure and blue-green luminescence with the PL peak at 460nm. The bandgap is ~1.74 eV, which is relatively ideal for optoelectronic devices. Moreover, the resistive switching devices based on Cs2CuBr4 single crystals thin films were also fabricated, showing the excellent reversible threshold switching behaviour and robustness of 2D Cs2CuBr4 material. We believe this thesis significantly demonstrated that lead-free Cs2CuBr4 perovskites have potential to play an important role in the next-generation optoelectronic devices.
dc.language English
dc.language.iso en
dc.publisher UNSW, Sydney
dc.rights CC BY 4.0
dc.subject.other Perovskite
dc.subject.other Single Crystals
dc.subject.other Switching Devices
dc.subject.other Lead-free
dc.title Lead-Free Perovskite Cs2CuBr4 Single Crystals: Synthesis and Properties
dc.type Thesis
dcterms.accessRights embargoed access
dcterms.rightsHolder Yao, Yuchen
dspace.entity.type Publication
unsw.accessRights.uri 2024-03-09
unsw.description.embargoNote Embargoed until 2024-03-09
unsw.relation.faculty Science School of Materials Science & Engineering School of Materials Science & Engineering
unsw.subject.fieldofresearchcode 340304 Optical properties of materials
unsw.subject.fieldofresearchcode 340301 Inorganic materials (incl. nanomaterials)
unsw.subject.fieldofresearchcode 401605 Functional materials
unsw.thesis.degreetype Masters Thesis
Resource type