Phase Transitions in Low-Dimensional Layered Double Perovskites: The Role of the Organic Moieties
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Martín-García, Beatriz Spirito, Davide Biffi, Giulia Artyukhin, Sergey Bonaccorso, Francesco Krahne, Roman |
| author_facet | Martín-García, Beatriz Spirito, Davide Biffi, Giulia Artyukhin, Sergey Bonaccorso, Francesco Krahne, Roman |
| contents | Halide double perovskites are an interesting alternative to Pb-containing counterparts as active materials in optoelectronic devices. Low-dimensional double perovskites are fabricated by introducing large organic cations, resulting in organic/inorganic architectures with one or more inorganic octahedral layers separated by organic cations. Here, we synthesize layered double perovskites based on 3D Cs2AgBiBr6 that consist of double (2L) or single (1L) inorganic octahedral layers, using ammonium cations of different size and chemical structure. Temperature-dependent Raman spectroscopy reveals phase transition signatures in both inorganic lattice and organic moieties by detecting variations in their vibrational modes. Changes in the conformational arrangement of the organic cations to an ordered state coincide with a phase transition in the 1L systems with the shortest ammonium moieties. Significant changes of photoluminescence intensity observed around the transition temperature suggest that optical properties may be deeply affected by the octahedral tilts emerging at the phase transition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_13032 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Phase Transitions in Low-Dimensional Layered Double Perovskites: The Role of the Organic Moieties Martín-García, Beatriz Spirito, Davide Biffi, Giulia Artyukhin, Sergey Bonaccorso, Francesco Krahne, Roman Materials Science Other Condensed Matter Halide double perovskites are an interesting alternative to Pb-containing counterparts as active materials in optoelectronic devices. Low-dimensional double perovskites are fabricated by introducing large organic cations, resulting in organic/inorganic architectures with one or more inorganic octahedral layers separated by organic cations. Here, we synthesize layered double perovskites based on 3D Cs2AgBiBr6 that consist of double (2L) or single (1L) inorganic octahedral layers, using ammonium cations of different size and chemical structure. Temperature-dependent Raman spectroscopy reveals phase transition signatures in both inorganic lattice and organic moieties by detecting variations in their vibrational modes. Changes in the conformational arrangement of the organic cations to an ordered state coincide with a phase transition in the 1L systems with the shortest ammonium moieties. Significant changes of photoluminescence intensity observed around the transition temperature suggest that optical properties may be deeply affected by the octahedral tilts emerging at the phase transition. |
| title | Phase Transitions in Low-Dimensional Layered Double Perovskites: The Role of the Organic Moieties |
| topic | Materials Science Other Condensed Matter |
| url | https://arxiv.org/abs/2601.13032 |