Polar Indirect Valley as a Limiting Factor for Radiative Efficiency in Gold-Based Mixed-Valence Double Perovskites
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909600800833536 |
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| author | Kameni, Ange B. Chambissie Py-Renaudie, Alexandre Garrot, Damien Berenguier, Baptiste Bouchez, Guillaume Ceratti, Davide Raffaele Schulz, Philip Guillemoles, Jean-François Delport, Géraud |
| author_facet | Kameni, Ange B. Chambissie Py-Renaudie, Alexandre Garrot, Damien Berenguier, Baptiste Bouchez, Guillaume Ceratti, Davide Raffaele Schulz, Philip Guillemoles, Jean-François Delport, Géraud |
| contents | Double perovskites have emerged as promising alternatives to lead halide perovskites, aiming to mitigate challenges related to toxicity and chemical instability. Among them, mixed-valence gold halides such as Cs2Au+Au3+Cl6, which contain only a single type of metal cation in two oxidation states, stand out due to their unique structural and electronic properties. These materials exhibit strong absorption in the near-infrared range, making them attractive candidates for optoelectronic applications such as photovoltaics. In this work, we employ temperature-dependent optical spectroscopy techniques to demonstrate that these compounds exhibit particularly strong polar electron-phonon coupling, which has a profound impact on their optoelectronic properties. In particular, this coupling gives rise to a temperature-dependent absorption tail that reshapes the global spectral spectrum. We show that this tail leads to a forbidden band-egde recombination, which explains the reported difficulties in detecting a photoluminescence signal from this class of double perovskites. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_01904 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polar Indirect Valley as a Limiting Factor for Radiative Efficiency in Gold-Based Mixed-Valence Double Perovskites Kameni, Ange B. Chambissie Py-Renaudie, Alexandre Garrot, Damien Berenguier, Baptiste Bouchez, Guillaume Ceratti, Davide Raffaele Schulz, Philip Guillemoles, Jean-François Delport, Géraud Materials Science Double perovskites have emerged as promising alternatives to lead halide perovskites, aiming to mitigate challenges related to toxicity and chemical instability. Among them, mixed-valence gold halides such as Cs2Au+Au3+Cl6, which contain only a single type of metal cation in two oxidation states, stand out due to their unique structural and electronic properties. These materials exhibit strong absorption in the near-infrared range, making them attractive candidates for optoelectronic applications such as photovoltaics. In this work, we employ temperature-dependent optical spectroscopy techniques to demonstrate that these compounds exhibit particularly strong polar electron-phonon coupling, which has a profound impact on their optoelectronic properties. In particular, this coupling gives rise to a temperature-dependent absorption tail that reshapes the global spectral spectrum. We show that this tail leads to a forbidden band-egde recombination, which explains the reported difficulties in detecting a photoluminescence signal from this class of double perovskites. |
| title | Polar Indirect Valley as a Limiting Factor for Radiative Efficiency in Gold-Based Mixed-Valence Double Perovskites |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.01904 |