Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.342
Publication date: 16th December 2024
Bismuth-based perovskite-inspired materials (Bi-PIMs) have garnered significant attention as promising alternatives to lead (Pb)-based perovskites due to their lower toxicity and higher environmental stability. These semiconductors, which include compounds like Cu2AgBiI6 and A3Bi2I9, exhibit intriguing optoelectronic properties that make them suitable for photovoltaic applications. Bismuth (Bi)3+ shares similar electronic configurations with Pb2+, hinting to replicate the defect-tolerant electronic structure of lead-halide perovskites. This defect tolerance is crucial for reducing nonradiative recombination losses in Bi-based devices. Nevertheless, Bi-PIMs are also known to crystallize in disordered structures with a large number of surface defects/vacancies and grain boundaries compared to Pb-based perovskites, which explains their modest performance as photovoltaic absorbers. [1] This raises important questions: How can we mitigate the density and detrimental effect of defects in Bi-PIMs? Could the defect-driven structural characteristics of Bi-PIMs be utilized to expand the applications of these materials in photonics beyond photovoltaics?
In the first part of the talk, I will first summarize our key findings on selected Bi-PIMs for photovoltaic applications. In particular, I will present recent results on our compositional engineering efforts to improve morphology and charge carrier transport in Bi-Pims, leading to enhanced efficiency in both outdoor and indoor PV. [2,3]
In the second part of the talk, I will demonstrate second harmonic generation (SHG) for two low-toxicity Bi-PIMs, Cu2AgBiI6 (CABI) and AgBiI4 (ABI), using non-invasive nonlinear optical microscopy. The Bi-PIM with the largest number of cation vacancies, CABI, exhibits the most pronounced local inversion symmetry breaking, as assessed by the determination of the octahedral distortion angles. Consequently, CABI produces stronger SHG signals compared to ABI.
Our findings not only advance our understanding of Bi-PIMs but also open new avenues for their application in photonics.
P.V. thanks Academy of Finland (Decision No 347772) and Jane and Aatos Erkko Foundation (SOL-TECH project) for the financial support. This work is part of the Academy of Finland Flagship Programme, Photonics Research and Innovation (PREIN), Decision No. 320165.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.