{
  "abstract": "Silicon phthalocyanines (R2-SiPcs) are an emerging class of high-performance organic semiconductors which have recently found application in highly sensitive and selective bilayer organic heterojunction devices for ammonia (NH3) sensing. We report bilayer heterojunction devices based on axially-substituted bis(pentafluorophenoxy)silicon phthalocyanines of increasing peripheral fluorination ((F5PhO)2-FXSiPc) as a bottom layer and lutetium bis-phthalocyanine (LuPc2) and demonstrate how increased peripheral fluorination changes device operation from p-type to n-type in response to NH3. Sensors fabricated with (F5PhO)2-F16SiPc exhibits the smallest apparent energy barrier for interfacial charge transport by impedance spectroscopy due to better alignment of the semiconductor molecular orbitals with the semi-occupied molecular orbital of LuPc2. Bilayer heterojunction devices all demonstrated a LOD below 1 ppm with (F5PhO)2-SiPc/LuPc2 yielding an LOD of 308 ppb and a sensitivity of -0.72 %·ppm-1. Postdeposition thermal annealing of the (F5PhO)2-SiPc/LuPc2 device is shown to further enhance sensor performance with a two-fold increase in sensitivity to -1.15 %·ppm-1 and a LOD of 198 ppb.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "Benjamin King"
    },
    {
      "name": "Sujithkumar Ganesh Moorthy"
    },
    {
      "name": "Eric Lesniewska"
    },
    {
      "name": "Rita Meunier-Prest"
    },
    {
      "name": "Marcel Bouvet"
    },
    {
      "name": "Benoît H Lessard"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1kzcv7kafbprq.bib",
  "cited_by": 25,
  "doi": "10.1016/j.snb.2024.135507",
  "fulltext_url": null,
  "id": "1kzcv7kafbprq",
  "issns": [
    "0925-4005",
    "1873-3077"
  ],
  "landing_url": "https://hal.science/hal-05843247v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "openalex",
      "2208|Gas Sensing Nanomaterials and Sensors"
    ]
  ],
  "openalex": "W4391888186",
  "pdf_url": "https://hal.science/hal-05843247/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": "Elsevier",
  "ris": "https://research.draconitic.com/paper/1kzcv7kafbprq.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:03Z",
      "native_id": "hal-05843247",
      "source": "hal",
      "url": "https://hal.science/hal-05843247v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "hal:0.chim",
      "subfield": "general"
    },
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "title": "Modulating the majority charge carrier type and performance of organic heterojunction ammonia sensors by increasing peripheral fluorination of the silicon phthalocyanine sublayer",
  "title_text": "Modulating the majority charge carrier type and performance of organic heterojunction ammonia sensors by increasing peripheral fluorination of the silicon phthalocyanine sublayer",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T12:20:56Z",
  "url": "https://research.draconitic.com/paper/1kzcv7kafbprq",
  "venue": "Sensors and Actuators B: Chemical",
  "versions": []
}