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

Yoshihiko Kanemitsu, Tetsuo Ogawa, Kenji Shiraishi, Kyozaburo Takeda

研究成果: Article

507 引用 (Scopus)

抜粋

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.

元の言語English
ページ(範囲)4883-4886
ページ数4
ジャーナルPhysical Review B
48
発行部数7
DOI
出版物ステータスPublished - 1993 1 1
外部発表Yes

ASJC Scopus subject areas

  • Condensed Matter Physics

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