Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Perovskite solar cells (PSC’s) have revealed remarkable development in recent years with rapid increases in efficiency, from about 3% in 2009 to over 25% today. While perovskite solar cells have emerged to be highly efficient in a very short time, still various challenges remain before they can become a competitive commercial technology. Hence it is a dire need to improve PSCs stability, and scalability [JB1] by enhancement of thin film homogeneity, grain size (eliminating grain boundaries) and by morphological and compositional modification. However, solvent processing and thermal annealing generates relatively small grains during rapid perovskite crystallization. The presence of small grains is an indication of the existence of local inhomogeneity in these films in terms of lattice strains and material composition with the local inhomogeneity being observed not only intergrain but also intragrain. In addition, the grain boundaries can host defects an increase recombination rates, as well as degradation. Therefore, eliminating the local inhomogeneities, particularly at the grain boundaries, is a crucial path to enhance performance of perovskite optoelectronic devices [1].
Formamidinium lead iodide (FAPbI3)-based perovskites have emerged as one of the most promising candidate materials for high efficiency and stable perovskite solar cells due to their high thermal stability, excellent optoelectrical properties and ideal bandgap energy. However, the phase degradation of black a-FAPbI3 perovskite phase to yellow non perovskite phase at ambient conditions restricts the long-term stability of FAPbI3 perovskite solar cells. We have previously demonstrated a method for performance and stability improvements in formamidinium lead iodide (FAPbI3)-based perovskites by crystallisation in the presence of a solvent aerosol[2]. Here, we develop this method further by adding methylammonium thiocyanate (MASCN) to the solvent aerosol for crystallisation of FAPbI3 perovskite films, following our previous work demonstrating additive-enhanced post-treatment of perovskite films[3]. Adding MASCN to the aerosol leads to further improvements in crystallinity and grain size compared to solvent-only treated films. These changes lead to prolonged charge-carrier lifetimes and ultimately improved device efficiencies. By demonstrating the benefit of additives in this aerosol-assisted crystallisation process, this work opens up wider processing options to enhance the crystallinity, grain size, film homogeneity and efficiency of perovskites.
1.School of Engineering and Materials Science and Materials Research Institute, Queen Mary University of London, London E1 4NS, UK
2.Joe Briscoe Group
3.Higher Education Commision Pakistan
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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.
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