Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.365
Publication date: 16th December 2024
The rapid expansion of the Internet-of-Things (IoT) is driving the demand for energy-autonomous devices. With billions of wireless sensors expected to be installed in indoor environments over the next decade, battery usage in IoT is growing, leading to higher management costs and waste. Indoor photovoltaics (IPVs) offer a sustainable power solution by reducing battery waste. [1] Air-stable perovskite-inspired materials (PIMs) are promising low-toxicity semiconductors with wide bandgaps (1.8–2.0 eV) for efficient indoor light harvesting, with theoretical IPV efficiencies approaching 40% or more. However, the inherent low-dimensional nature of PIMs and high defect densities pose challenges, such as carrier localization, in achieving very high IPV efficiencies. [2]
In this talk, I will present our recent results on two-dimensional PIMs comprising Group VA pnictogen cations, such as antimony (III) (Sb3+) and bismuth (III) (Bi3+). Through thorough compositional engineering at each crystallographic site (A, B, X) of the PIM structure, we achieved the highest indoor power conversion efficiency for IPVs based on halide PIMs. [3-5] Notably, the IPV devices of Cs2AgBi2I9 PIM maintained consistent performance under different light color temperatures, demonstrating the versatility of Cs2AgBi2I9 as a reliable IPV absorber in various indoor environments. Our research paves the way for sustainable indoor light harvesting by identifying or developing 2D pnictogen-based PIMs with adaptable structural and photophysical properties.
References:
[1] Liu et al., Chem. Eng. J. 2024, 154944
https://www.sciencedirect.com/science/article/pii/S1385894724064350
[2] Grandhi et al., Adv. Funct. Mater. 2023, Early View, https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202307441
[3] Lamminen et al., Adv. Energy Mater. 2023, 13, 2203175.
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.202203175
[4] Grandhi et al., Sust. Energ Fuels 2023, 7, 66. https://pubs.rsc.org/en/content/articlehtml/2023/se/d2se00995a
[5] Hossain et al., Chem. Mater. 2024, 16, 7781, https://pubs.acs.org/doi/abs/10.1021/acs.chemmater.4c01045
P.V. acknowledges the financial support of Jane and Aatos Erkko Foundation within the SOL-TECH project. P.V. also thanks Research Council of Finland, Decision No. 347772. This work was part of the Research Council of Finland Flagship Programme, Photonics Research, and Innovation (PREIN), Decision No. 320165.
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