536 31 980 3 5765 document 980 Perovskite IL data for open access.zip application/zip 862ba4f30c57d74bd76d896112600b59 MD5 8113566 2025-02-18 12:43:26 https://data.lancashire.ac.uk/id/eprint/536/2/Perovskite%20IL%20data%20for%20open%20access.zip 536 2 2 application/zip application/zip Vamas files, Igor files, SLE file en public cc_by_sa

Perovskite IL data for open access.zip

data FALSE archive 7555 disk0/00/00/05/36 2025-02-18 14:30:06 2026-10-07 15:34:27 2025-02-18 14:30:06 data_collection show Tiwari Udit utiwari@bedford.ac.uk https://orcid.org/0009-0007-6007-1897 Cole Jordan jordancole1024@gmail.com https://orcid.org/0000-0002-0325-2049 Li Zheshen zsli@phys.au.dk https://orcid.org/0000-0002-8381-1620 Walton Alex alex.walton@manchester.ac.uk https://orcid.org/0000-0002-3207-8406 Dwyer Liam liam.dwyer@manchester.ac.uk https://orcid.org/0009-0005-9315-749X Spencer Ben ben.spencer@manchester.ac.uk https://orcid.org/0000-0002-1453-5327 Zlatogorsky Sergey szlatogorsky@uclan.ac.uk https://orcid.org/0000-0003-0696-4284 Syres Karen ksyres@uclan.ac.uk https://orcid.org/0000-0001-7439-475X F170 F200 F320 2023sub_E_C_M_P perovskite; ionic liquid; XPS 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. 10.17030/uclan.data.00000536 dataset 801604 DTA3/COFUND Marie Skłodowska-Curie ISA-22-1009 ASTRID2 EP/Y023587/1, EP/Y023609/1, EP/Y023536/1, EP/Y023552/1 and EP/Y023544/1 EPSRC National Facility for XPS EP/R00661X/1, EP/S019367/1, EP/P025021/1 and EP/P025498/1 Henry Royce Institute for Advanced Materials rdmsupport@lancashire.ac.uk Senior Lecturer in Physics Syres Karen KSyres@uclan.ac.uk thesis https://clok.uclan.ac.uk/53051/1/PhD_Thesis_Udit_Tiwari.pdf https://clok.uclan.ac.uk/53051/1/PhD_Thesis_Udit_Tiwari.pdf pub DOI https://doi.org/10.1039/D5LF00206K https://clok.uclan.ac.uk/56666 IL-modified perovskite films were studied using X-ray Photoelectron Spectroscopy (XPS), Near Edge X-ray Absorption Fine Structure (NEXAFS), Hard X-ray Photoelectron Spectroscopy (HAXPES), Near-Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS) at ASTRID2 synchrotron and Henry Royce Facilities. 2022-06-14 2023-01-27