Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO25)
Publication date: 24th April 2025
The pursuit of efficient, stable, and environmentally benign materials for photovoltaic and optoelectronic applications has accelerated the development of lead-free perovskites. In this study, we investigate the optoelectronic properties and multifunctionality of bismuth-based perovskite systems across three distinct applications.
The impact of indium doping on the structural and photovoltaic performance of lead-free (CH₃NH₃)₃Bi₂–ₓInₓI₉ perovskites were explored. Optimized Bi–In compositions exhibited improved crystallinity and optical absorption, achieving power conversion efficiencies (PCE) of 2.5% under AM 1.5G solar illumination and 5.9% under indoor LED lighting—demonstrating strong potential for ambient light harvesting in indoor photovoltaic devices.
In ongoing work, we are developing a colorimetric NH₃ gas sensor using the same bismuth-based perovskite material. Initial results show a visible and reversible color change upon exposure to ammonia gas, suggesting suitability for low-cost, real-time gas detection.
Additionally, we are investigating photoelectrochemical (PEC) water splitting using TiO₂ deposited on nickel foam to enhance catalytic performance. Early experiments indicate improved charge transport and promising hydrogen evolution efficiency, supporting the potential of this system for scalable solar-driven hydrogen production.
These combined efforts underscore the versatility of lead-free perovskites in addressing key challenges across sustainable energy, environmental sensing, and photocatalysis.
The author gratefully acknowledges the Petroleum Technology Development Fund (PTDF), Nigeria, for sponsoring this research through a doctoral fellowship. Special thanks to Associate Professor Sagar Jain and Dr. Mingming Zhu for their valuable supervision and continuous guidance throughout the study. This work was carried out at Cranfield University, whose facilities and research environment have been instrumental to the project’s success.
The author also extends appreciation to research collaborators and team members Ramesh Kumar, Hairui Liu, Seyed Ali Nabavi, Suhas Mahesh, Henry Snaith, and Monojit Bag for their insights and technical support across different stages of the investigation. Their contributions, ranging from material characterization to device fabrication, have significantly enriched the scope and rigor of the work.
This study forms part of ongoing efforts within the broader scientific community to develop sustainable, lead-free materials for optoelectronic and energy applications.
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