Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.108
Publication date: 18th December 2023
Compared to single junction solar cells, multi-junction architectures can harvest a wider range of the sun´s spectrum while reducing thermalization losses, thus potentially leading to larger efficiencies [1, 2]. Regardless of the specific geometry, i.e. stack, spectral splitting or rainbow, material systems with band gaps wider and narrower than the single junction optimum should be developed to fully exploit the multi-junction concepts [2]. Importantly, the specific materials combination, as well as device parameters (e.g. thickness) are strongly correlated in a multiparametric optimization problem.
In this contribution, we will show our current strategy to tackle this challenge: combining high throughput material screening methods [3] with a spectrum on demand light source [4]. In particular, we focus on materials with narrow bandgap, for which we have screened more than 15 systems, and wide bandgap for which we investigated 9 material combinations and two solvents. Then, we use the best systems to build Rainbow solar cells, i.e. an in-plane spectral splitting geometry in which a series of sub-cells are placed next to each other laterally, and illuminated through an optical component that splits the incoming white beam into its spectral components, thus matching local spectrum and absorption for each sub-cell [5].
[1] D. CarloRasi and R. A. J. Janssen, “Advances in Solution-Processed Multijunction Organic Solar Cells,” Advanced Materials, 31 (2019) 1806499.
[2] I. M. Peters et al, “Practical limits of multijunction solar cells”, Prog. In Photovolt. 31 (2023) 1006.
[3] A. Harillo-Baños et al, “Efficient Exploration of the Composition Space in Ternary Organic Solar Cells by Combining High-Throughput Material Libraries and Hyperspectral Imaging”, Adv. Ener. Mater., 10 (2020) 1902417.
[4] M. Casademont-Viñas et al “Spectrum on demand light source (SOLS) for advanced photovoltaic characterization”, Rev. Sci. Instrum. 94 (2023) 103907.
[5] M. Gibert-Roca et al, “RAINBOW Organic Solar Cells: Implementing Spectral Splitting in Lateral Multi-Junction Architectures” Adv. Mater (2023) 2212226.
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