{
  "abstract": "High-efficiency vertical charge transport in multilayer organic optoelectronic devices highly depends on molecular structure and arrangement. Using two T2-(NDI-T2)2 conjugated oligomers with ethylhexyl (EH) and octyldodecyl (OD) side chains as a model system, their effects on electron transport are investigated using, among other techniques, atomic force microscopy (AFM), conductive atomic force microscopy (C-AFM), grazing-incidence wide-angle X-ray scattering (GIWAXS), steady-state optical spectroscopy, and time-dependent density functional theory (TDDFT) calculations. The oligomers of both materials exhibit relatively disordered structures in the as-cast state, whereas annealing enhances structural order and leads to side-chain-dependent changes in molecular stacking. EH-based films show a smaller annealing-induced photoluminescence shift than OD-based films, suggesting less pronounced stacking and conformational rearrangements, consistent with TDDFT-supported exciton analysis. The current-voltage characteristics are analyzed using the space-charge-limited current (SCLC) model. After annealing, both materials exhibit improved vertical electron mobility. The EH-based films reach a maximum mobility of 1.2 x 10^-4 cm^2 V^-1 s^-1. The combined results suggest that the shorter EH side chains modify the out-of-plane packing environment and facilitate vertical electron transport. These results establish a structure-property relationship between side-chain structure, molecular order, exciton coupling and vertical mobility, providing a molecular design basis for optimising organic semiconductors through side-chain engineering.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.32456",
  "author_total": 16,
  "authors": [
    {
      "name": "Zihao Liu"
    },
    {
      "name": "Hajar Komekoz"
    },
    {
      "name": "Nisarg Trivedi"
    },
    {
      "name": "Max Dorfner"
    },
    {
      "name": "Lokesh Rasabathina"
    },
    {
      "name": "Rico Ehrler"
    },
    {
      "name": "Mike Hambsch"
    },
    {
      "name": "Chen Wang"
    },
    {
      "name": "Dietrich R. T. Zahn"
    },
    {
      "name": "Jörg Matysik"
    },
    {
      "name": "Stefan C. B. Mannsfeld"
    },
    {
      "name": "Carsten Deibel"
    },
    {
      "name": "Olav Hellwig"
    },
    {
      "name": "Frank Ortmann"
    },
    {
      "name": "Michael Sommer"
    },
    {
      "name": "Georgeta Salvan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0ysyma21yd2mb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.32456",
  "fulltext_url": null,
  "id": "0ysyma21yd2mb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.32456",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2208|Organic Electronics and Photovoltaics"
    ]
  ],
  "openalex": "W7223699078",
  "pdf_url": "https://arxiv.org/pdf/2610.32456",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0ysyma21yd2mb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:15Z",
      "native_id": "2610.32456",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.32456"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Side-Chain Engineering Controls Molecular Packing and Vertical Electron Transport in Discrete n-Type NDI-T2 Oligomers",
  "title_text": "Side-Chain Engineering Controls Molecular Packing and Vertical Electron Transport in Discrete n-Type NDI-T2 Oligomers",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:15Z",
  "url": "https://research.draconitic.com/paper/0ysyma21yd2mb",
  "venue": "arXiv",
  "versions": []
}