Visible photoluminescence from oxidized Si nanometer-sized spheres: Exciton confinement on a spherical shell

Yoshihiko Kanemitsu, Tetsuo Ogawa, Kenji Shiraishi, Kyozaburo Takeda

Research output: Contribution to journalArticle

506 Citations (Scopus)

Abstract

We report strong visible photoluminescence (PL) at room temperature from oxidized Si nanometer-sized spheres with a spherical crystalline Si (c-Si) core and an amorphous SiO2 (a-SiO2) surface layer. The peak energy of the broad PL spectrum is about 1.65 eV, which is independent of the core diameter. We propose a model in which excitons are confined on a spherical shell, an interfacial layer between the c-Si core and the a-SiO2 surface layer, and in which the exciton confinement enhances the oscillator strength and the PL intensity.

Original languageEnglish
Pages (from-to)4883-4886
Number of pages4
JournalPhysical Review B
Volume48
Issue number7
DOIs
Publication statusPublished - 1993 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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