| Author: | Lyu, Yunyang |
| Title: | Tin based perovskite solar cells for tandem application |
| Advisors: | Liu, Kuan (EEE) |
| Degree: | M.Sc. |
| Year: | 2024 |
| Department: | Department of Electrical and Electronic Engineering |
| Pages: | vii, 38 pages : color illustrations |
| Language: | English |
| Abstract: | Organic inorganic hybrid perovskite materials have attracted widespread attention due to their high optical absorption coefficient, high carrier mobility and diffusion length, direct tunability of optical bandgap, and low-temperature solution processability. At present, perovskite solar cells (PSCs) have achieved a certified efficiency of 25.7%. However, the lead element widely used in perovskite materials is highly toxic and has extremely serious environmental impacts, which also affects the commercialization process of PSCs. Narrow bandgap tin lead mixed perovskite materials stand out among many lead-free and low lead perovskite materials due to their low toxicity, high electron mobility, and low exciton binding energy. Although narrow bandgap tin lead PSCs have developed rapidly in recent years, there has been a significant improvement in the photoelectric conversion efficiency (PCE). However, the numerous defects present in tin lead mixed perovskite materials hinder their further application, such as the rapid crystallization of tin lead mixed perovskite leading to poor film quality. Therefore, the crystallization performance, film morphology, and stability of PSCs of tin lead mixed perovskite still face significant challenges. This paper focuses on the preparation process of narrow bandgap tin lead mixed PSCs and the optimization of their performance through additive engineering. It mainly includes the following two aspects: 1. By exploring the preparation process of the hole transport layer in tin lead mixed perovskite, the optimal preparation conditions for solar cells in this tin lead mixed perovskite system were successfully obtained, and a preliminary photoelectric conversion efficiency of 10.02% was achieved. This laid the foundation for the following experiment. 2. By adding p-fluorophenylethylamine bromide (FPEABr) as an additive to the tin lead mixed perovskite precursor solution, FPEABr effectively controls the crystallization of perovskite solar cells, reduces the surface roughness of perovskite, improves the crystallinity and crystal size of perovskite, and effectively optimizes the crystallization process of perovskite. Finally, the PCE of tin lead mixed PSCs prepared based on FPEABr additive engineering increased from 10.02% of the standard sample to 16.17%. This work is the first to add p-fluorophenylethylamine bromide to the precursor solution of tin lead mixed perovskite. By replacing the A-site in perovskite with PEA+, the photoelectric performance of tin lead mixed PSCs is improved, further promoting the development of narrow bandgap tin lead mixed PSCs and all perovskite stacked solar cells. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8296.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.54 MB | Adobe PDF | View/Open |
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