Development of perovskites based light emitting diodes with improved stability

• Main Author: Diviyadhakshaini Singaravelan
• Other Authors: Fan Weijun
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2021
• Subjects: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
• Online Access: https://hdl.handle.net/10356/149286
• Institution: Nanyang Technological University

With the rise in utilisation of optoelectronic devices for applications such as solar cells and telecommunication, there is a demand to increase the efficiency of these devices. Studies have been performed to identify best methods of fabricating perovskite nanocrystals which will be used in these devices. However, after fabrication, the stability of its characteristics must be maintained due to its nature of degrading when exposed to UV light. Hence, to increase the life of optoelectronic devices, the Ligand-Assisted Re-Precipitation method has been selected for fabricating Perovskite-based nanocrystals for this project. Stability tests, UV test and Heat test were conducted by optimising factors like stirring speed of Cesium Lead (II) Halides to identify the optimal parameters required to obtain the most stable characteristics of the nanocrystals. Successfully deploying the outcome of this project would contribute to Singapore’s climate action plan which aims to reduce the intensity of greenhouse gas emissions by the year 2030. This report consists of the experimental procedures conducted for the fabrication of Perovskite- based nanocrystals, test results and analysis for the different chemical compounds used, failed experiments, obstacles faced throughout the project and future recommendations for this project. Despite the lack of resources required for the experiments, a detailed and constructive study of how to further improve the stability of the nanocrystals, will be provided by the end of the report.