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PreprintCC BYChemRxiv

The Least-Ordered of Three Deep-Blue Phosphine-Oxide Hosts Still Conducts Holes Cleanly

  • Manmohan Dash1,2
  • M. N. Satyanarayan1,2
  • Jayathirtha Rao Vaidya3
  1. 1Department of Physics
  2. 2National Institute of Technology Karnataka
  3. 3CSIR–Indian Institute of Chemical Technology
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Abstract

Deep-blue phosphine-oxide hosts are compared by energy levels and photophysics, almost never by microstructure—yet order and film morphology are routinely read as proxies for how well a host will carry charge. Here three related hosts are compared from primary particles to film relief with documented, protocol-tested descriptors. The tert-butyl-substituted S3 host emerges as the least ordered on every scale: the lowest X-ray ordered fraction at every baseline setting, the shortest film correlation, micrometre-scale relief and the lowest decomposition temperature, while only the S1 host shows lattice fringes. Disorder, however, does not spoil its hole transport. The S3 hole-only device shows a single, nearly ideal relaxation with a capacitance close to the geometric value and an apparent hole mobility of about 5 × 10−7 cm2 V−1 s−1, comparable to that of the far better-ordered S1 host. Long-range disorder in these hosts is therefore compatible with clean hole transport, and microstructure alone is not a reliable screen for transport.

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Cite

BibTeXRIS
BibTeX
@misc{dash2026leastordered,
  title = {{The Least-Ordered of Three Deep-Blue Phosphine-Oxide Hosts Still Conducts Holes Cleanly}},
  author = {Manmohan Dash and M. N. Satyanarayan and Jayathirtha Rao Vaidya},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15011188/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15011188/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - The Least-Ordered of Three Deep-Blue Phosphine-Oxide Hosts Still Conducts Holes Cleanly
AU  - Manmohan Dash
AU  - M. N. Satyanarayan
AU  - Jayathirtha Rao Vaidya
PY  - 2026
DA  - 2026/10/28
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15011188/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15011188/v1
AB  - Deep-blue phosphine-oxide hosts are compared by energy levels and photophysics, almost never by microstructure—yet order and film morphology are routinely read as proxies for how well a host will carry charge. Here three related hosts are compared from primary particles to film relief with documented, protocol-tested descriptors. The tert-butyl-substituted S3 host emerges as the least ordered on every scale: the lowest X-ray ordered fraction at every baseline setting, the shortest film correlation, micrometre-scale relief and the lowest decomposition temperature, while only the S1 host shows lattice fringes. Disorder, however, does not spoil its hole transport. The S3 hole-only device shows a single, nearly ideal relaxation with a capacitance close to the geometric value and an apparent hole mobility of about 5 × 10−7 cm2 V−1 s−1, comparable to that of the far better-ordered S1 host. Long-range disorder in these hosts is therefore compatible with clean hole transport, and microstructure alone is not a reliable screen for transport.
ER  -