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Tiwari, Udit and Cole, Jordan and Li, Zheshen and Walton, Alex and Dwyer, Liam and Spencer, Ben and Zlatogorsky, Sergey and Syres, Karen Ionic liquid-modified perovskite films for enhanced solar cell stability. [DataSet]
Description
Halide perovskites have emerged as promising candidates for photovoltaic applications due to their remarkable device efficiencies. Despite this progress, their commercial viability is hindered by structural instability under high temperature and humidity. Here, the stability of mixed-halide perovskites is enhanced by incorporating the ionic liquids (ILs) BMIMBF4 and BMIMCl. The resistance of the IL-modified films to heat and moisture is investigated using X-ray Photoelectron Spectroscopy (XPS), Near Edge X-ray Absorption Fine Structure (NEXAFS), Hard X-ray Photoelectron Spectroscopy (HAXPES) and Near-Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS). Additionally, the role of a SnO2 electron transport layer (ETL) is investigated for improving the stability of the IL-modified films. Results indicate that the IL-modified perovskite films on SnO2 demonstrate enhanced thermal stability, withstanding temperatures of at least 300 °C. BMIMBF4-modified films demonstrate superior thermal stability, attributed to BF4- ions interacting with SnO2 hydroxyl groups, which facilitate the formation of a BMIM cation overlayer on the perovskite surface. Conversely, in BMIMCl-modified films, BMIM cations diffuse into perovskite grain boundaries, enhancing crystallinity and neutralising surface defects. HAXPES results show that IL-modification protects the perovskite films from surface degradation. NAP-XPS results indicate that BMIMCl-modified films show greater resistance to water penetration than BMIMBF4-modified films. It is inferred that the combined use of ILs and SnO2 significantly enhances the thermal and moisture stability of perovskites, advancing their potential for commercial application.
| Research / Data Type: | Dataset |
|---|---|
| Keywords: | perovskite; ionic liquid; XPS |
| DOI: | 10.17030/uclan.data.00000536 |
| Depositing User: | Karen Syres |
| Date Deposited: | 18 Feb 2025 14:30 |
| Revision: | 29 |
| URI: | https://uclandata.uclan.ac.uk/id/eprint/536 |
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