| Author: | Cao, Menghua |
| Title: | Study on crystallization modulation for efficient all-inorganic perovskite solar cells |
| Advisors: | Li, Gang (EEE) |
| Degree: | M.Sc. |
| Year: | 2023 |
| Department: | Department of Electrical and Electronic Engineering |
| Pages: | 49 pages : color illustrations |
| Language: | English |
| Abstract: | Metal halide perovskite solar cells (PSCs) have attracted significant interest due to their low production costs, excellent material properties and power conversion efficiency (PCE). However, the presence of volatile organic components in high-efficiency hybrid PSCs hinders their development. This, coupled with their prolonged instability, has delayed their commercialization. Recently, all-inorganic PSCs (e.g., CsPbI2Br, CsPbI3) have gained attention due to their excellent thermal and chemical stability, and promising photovoltaic properties with a suitable bandgap for tandem application. However, less research has been conducted on the crystallization kinetics of CsPbI2Br films compared to conventional hybrid organic-inorganic perovskites used in PSCs. The production of high-quality all-inorganic films with good homogeneity and large perovskite grains using standard solution processing methods has proven challenging. Recent studies have, therefore focused on multifunctional materials and bottom contact engineering for constructing reliable and efficient PSC devices. In this project, we carefully investigated the impact of the ionic liquid (ILs) 1-ethyl-3-methylimidazolium hexafluorophosphate [EMIM+] [PF6] on the regulation of all-inorganic thin film morphology and the crystallization process. The results showed that ILs promote the crystallization of all-inorganic perovskite films, reducing the defect density of perovskite materials. This leads to a decrease in carrier recombination and an improvement in stability and PCE for CsPbI2Br PSCs. Moreover, alkali metal doped tin dioxides (SnO2) were utilized as the bottom contact layer to modulate the growth of high-quality all inorganic CsPbI3 perovskite films. This project paves the way for the industry to use straightforward processes to produce high-quality, highly reproducible all-inorganic perovskite films. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8266.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.08 MB | Adobe PDF | View/Open |
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