Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Lead-based perovskite solar cells (PSCs) have attracted significant interest for next-generation photovoltaics due to their high-power conversion efficiencies and compatibility with low-cost solution-processing techniques. However, defects, ion migration, and interfacial degradation continue to limit their long-term stability and performance. Ionic liquids (ILs) offer a promising approach to perovskite interface engineering because their ionic nature and chemical functionality can influence film formation, defect passivation, and interfacial properties. A detailed understanding of the chemical interactions induced by IL incorporation is therefore essential for developing more stable perovskite photovoltaic devices.
In this study, we investigate the influence of two imidazolium-based ionic liquids, 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF₄) and 1-butyl-3-methylimidazolium chloride (BMIMCl), on lead-based perovskite thin films and their interfaces with charge transport layers. Model SnO₂/perovskite and NiOₓ/perovskite thin-film architectures were fabricated on titanium substrates using solution-based deposition and thermal processing. These structures were designed to provide controlled model interfaces representing electron- and hole-transport configurations in perovskite photovoltaic devices.
To elucidate the effects of ionic-liquid incorporation, synchrotron-based X-ray Photoelectron Spectroscopy (XPS) and Near-Edge X-ray Absorption Fine Structure (NEXAFS) measurements were performed at Aarhus University. The complementary techniques enable investigation of elemental composition, chemical states, surface chemistry, and electronic structure at the modified perovskite interfaces.
Comparison of BMIMBF₄- and BMIMCl-modified samples across SnO₂/perovskite and NiOₓ/perovskite structures provide insight into how ionic-liquid chemistry affects perovskite interfaces and charge-transport-layer interactions. The results are expected to contribute to a fundamental understanding of ionic-liquid-assisted interface engineering in perovskite photovoltaics, with relevance to the development of more stable and efficient hybrid photovoltaic devices.
I am deeply grateful to my supervisors, Dr Karen Syres, Dr Udit Tiwari, Dr Sergey Zlatogorsky, and Dr Zoë Henderson for their constant support and guidance. Special mention to beamline scientist Dr Zheshen Li, for his kindness, support, and collaboration. I would like to extend my sincere thanks to Doctoral Training Centre (DTC), University of Lancashire for the studentship and support, which plays a significant role in sharing my research and engaging with the academic community.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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