Photocreated metastable states in polysilanes

Kyozaburo Takeda, Kenji Shiraishi, Michiya Fujiki, Michio Kondo, Kazuo Morigaki

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Photocreated metastable states in organopolysilane (PSi) solids are observed using the electron-spin-resonance (ESR) technique. Two types of light-induced ESR (LESR) spectra are found depending on the excitation photon energy. These two types of LESR centers are annihilated by thermal annealing. Based on a first-principle electronic calculation, the origins of these LESR centers have been discussed. The lowest photoexcitation (∼3.5 eV) in PSi induces the Si skeleton stretching forces, which creates a weak bond (WB) in several places of the Si skeleton. Electronically, this WB acts as a self-trapping center for the photoexcited σ electron. The other higher photoexcitation (over 4.8 eV) causes side-pendant dissociation, which creates a dangling bond (DB) and causes the localized midgap state. The four lines found in the higher-energy excitation are considered to arise from hyperfine interaction between this DB electron and a sodium impurity nucleus.

Original languageEnglish
Pages (from-to)5171-5179
Number of pages9
JournalPhysical Review B
Volume50
Issue number8
DOIs
Publication statusPublished - 1994
Externally publishedYes

Fingerprint

Polysilanes
polysilanes
metastable state
Paramagnetic resonance
photoexcitation
musculoskeletal system
Dangling bonds
Photoexcitation
electron paramagnetic resonance
causes
excitation
Electrons
Excitation energy
electrons
trapping
sodium
dissociation
Stretching
impurities
annealing

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Takeda, K., Shiraishi, K., Fujiki, M., Kondo, M., & Morigaki, K. (1994). Photocreated metastable states in polysilanes. Physical Review B, 50(8), 5171-5179. https://doi.org/10.1103/PhysRevB.50.5171

Photocreated metastable states in polysilanes. / Takeda, Kyozaburo; Shiraishi, Kenji; Fujiki, Michiya; Kondo, Michio; Morigaki, Kazuo.

In: Physical Review B, Vol. 50, No. 8, 1994, p. 5171-5179.

Research output: Contribution to journalArticle

Takeda, K, Shiraishi, K, Fujiki, M, Kondo, M & Morigaki, K 1994, 'Photocreated metastable states in polysilanes', Physical Review B, vol. 50, no. 8, pp. 5171-5179. https://doi.org/10.1103/PhysRevB.50.5171
Takeda, Kyozaburo ; Shiraishi, Kenji ; Fujiki, Michiya ; Kondo, Michio ; Morigaki, Kazuo. / Photocreated metastable states in polysilanes. In: Physical Review B. 1994 ; Vol. 50, No. 8. pp. 5171-5179.
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