Date of Award
Spring 5-15-2023
Degree Name
Master of Science (MS)
Degree Type
Thesis
Abstract
Halide perovskite has been extensively studied for its excellent optoelectronic properties. In this project, we want to explore some range of band gap that conventional 2D materials could not have. To overcome this challenge, we aimed to produce two-dimensional (2D) perovskites with large scale which is suitable for device fabrication and improve its stability using strain engineering. To prepare such 2D perovskite, we tried 2D transformation first and then decided to use confined growth to optimize result. For strain engineering, we employed sputtered nickel as an external stressor.
So far, we have produced multilayer polycrystalline perovskites material close to atomic single layer. For the strain engineering part, we have reassured that tensile-stressed perovskite deteriorates the perovskite quality faster than the zero-stressed one. XRD has been measured followed by the calculation of strain value. More experiments will be carried out to advance this research to produce high-quality single crystal perovskite, to find the optimal sputtering condition of compressive stress towards the ultimate optimized device.
Language
English (en)
Chair
Professor Sang-Hoon Bae, Mechanical Engineering & Masterial Science
Committee Members
Professor Rohan Mishra, Professor Xianglin Li