Electronic structures of halogenated polysilanes

H. Motoyama, K. Takeda, K. Shiraishi

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)

Abstract

The electronic structures of halogenated polysilanes (PSi), whose side chains are replaced by halogen (X) atoms, have been theoretically investigated based on the first-principles calculations. It was found that non-bonding (n) electrons localizing at the X atom produce an important orbital mixing with the σ valence electrons delocalized in the direction of the PSi skeleton (σ-n mixing). This σ-n mixing splits the top of the valence bands, and creates unoccupied states in the band gap. This valence-band-splitting effectively narrows the band gap to the visible range, and the unoccupied state in the band gap has the potential to be an electron acceptor. Moreover, we also investigated several replacement patterns as well as the kind of replaced halogen species (X=F, Cl, Br, I). The dispersion and energy position of the unoccupied state(s) can be artificially tuned by these chemical modifications. Thus, halogenation can change PSi into optoelectronic polymers with visible photoluminescence.

Original languageEnglish
Pages (from-to)385-390
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume486
Publication statusPublished - 1998 Jan 1
EventProceedings of the 1997 MRS Symposium - Boston, MA, USA
Duration: 1997 Dec 11997 Dec 3

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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