{
  "abstract": "Identifying defects responsible for non-radiative recombination in metal-halide perovskites remains challenging, with no common defect signatures established across compositions. Here, we combine fluence-dependent time-resolved photoluminescence, full Shockley--Read--Hall modelling and Bayesian posterior inference across an FA$_{1-x}$Cs$_x$PbI$_3$ compositional series. We show that trap occupation governs carrier dynamics and defect-parameter identifiability in semiconducting materials: weakly occupied states exhibit electron-capture-coefficient--trap-density degeneracies, whereas trap filling lifts them. In our perovskite systems, a non-degenerate signature $Tβ$, characterized by a strongly asymmetric $β_p/β_n$ capture-coefficient ratio, occurs across all compositions, suggesting substantial trap filling is a general feature of perovskite carrier dynamics. We further identify $Tα$ as a shared, device-performance-limiting non-radiative recombination channel, while a shallow $Tε$ signature unique to FAPbI$_3$ produces the largest steady-state non-radiative recombination rate and is consistent with the previously observed high stacking-fault density of this composition. This framework therefore provides a basis for comparing trapping signatures across different semiconducting materials at room temperature.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.21545",
  "author_total": 9,
  "authors": [
    {
      "name": "Maxim Simmonds"
    },
    {
      "name": "Katarzyna Pydzińska-Białek"
    },
    {
      "name": "Thomas C. Rossi"
    },
    {
      "name": "Mostafa Othman"
    },
    {
      "name": "Aïcha Hessler-Wyser"
    },
    {
      "name": "Christian Wolff"
    },
    {
      "name": "Christophe Ballif"
    },
    {
      "name": "Vincent M. Le Corre"
    },
    {
      "name": "Eva Unger"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8kvfq4b5g8n65.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.21545",
  "fulltext_url": null,
  "id": "8kvfq4b5g8n65",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.21545",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "physics.app-ph"
    ],
    [
      "openalex",
      "2208|Perovskite Materials and Applications"
    ]
  ],
  "openalex": "W7213949961",
  "pdf_url": "https://arxiv.org/pdf/2609.21545",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8kvfq4b5g8n65.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.21545",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.21545"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Single Best Fits Can Be Misleading: Resolving Common Trapping Signatures across FA--Cs Perovskites",
  "title_text": "Single Best Fits Can Be Misleading: Resolving Common Trapping Signatures across FA--Cs Perovskites",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/8kvfq4b5g8n65",
  "venue": "arXiv",
  "versions": []
}