{
  "abstract": "Hot-carrier thermalization constitutes the dominant energy loss channel in perovskite photovoltaics, yet the role of epitaxial strain in controlling this process remains largely unexplored from first principles. We present a systematic firstprinciples study of strain-dependent hot-carrier cooling rates in six inorganic perovskiteshalides CsSnI3, CsSnBr3, and CsCaCl3, and oxides BaSnO3, BaZrO3, and KTaO3across a ±2% biaxial strain window. Eliashberg spectral functions ω2F (ε) are computed via density functional perturbation theory and Wannier interpolation, from which hot-carrier energy loss rates →dE/dt↑ are evaluated through the Fröhlich– EPW formalism for carrier temperatures up to 5000 K. Applying +1% tensile strain to BaZrO3 collapses the dominant-mode electron–phonon coupling constant from ϑ = 1.31 to ϑ = 0.011, suppressing the hot-carrier cooling rate by more than 90% relative to the least favorable strain condition and yielding a thermalization time ϖtherm = 1,585 fs and a hot-carrier figure of merit FOMHC = 1,348 fs, surpassing all halide configurations by more than an order of magnitude. Landau polynomial fitting of ε2 min (ϱ) confirms that no strain-induced structural phase transition occurs within ±2% for any compound, establishing a safe phonon engineering window. Orbital-projected densities of states reveal two mechanistically distinct coupling classes: gap-closure-driven coupling in BaSnO3 and CsCaCl3 [Spearman correlation ς(Eg, ϑ) ↓ ↔0.70] and purely phonon-mode-softening-driven coupling in BaZrO3 and KTaO3 (ς ↗ +0.72), the latter being invisible to band structure analysis alone.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Chemistry",
    "Indian Institute of Technology Gandhinagar"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Naveen Kumar"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Anirban Mondal",
      "orcid": "0000-0003-3029-8840"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7nf6za620y1d9.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15010951/v1",
  "fulltext_url": null,
  "id": "7nf6za620y1d9",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010951/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2208|Perovskite Materials and Applications"
    ]
  ],
  "openalex": "W7223348268",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/7nf6za620y1d9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:26Z",
      "native_id": "10.26434/chemrxiv.15010951",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010951/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "source:chemrxiv",
      "subfield": "general"
    }
  ],
  "title": "Strain-Tunable Electron–Phonon Coupling Collapse in Oxide Perovskites: A First-Principles Route to Suppressed Hot-Carrier Thermalization",
  "title_text": "Strain-Tunable Electron–Phonon Coupling Collapse in Oxide Perovskites: A First-Principles Route to Suppressed Hot-Carrier Thermalization",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:26Z",
  "url": "https://research.draconitic.com/paper/7nf6za620y1d9",
  "venue": "ChemRxiv",
  "versions": []
}