VISIBLE PHOTOLUMINESCENCE FROM OXIDIZED SI NANOMETER-SIZED SPHERES - EXCITON CONFINEMENT ON A SPHERICAL-SHELL

被引：490

作者：

KANEMITSU, Y ^{[1
]}

OGAWA, T ^{[1
]}

SHIRAISHI, K ^{[1
]}

TAKEDA, K ^{[1
]}

机构：

[1] NIPPON TELEGRAPH & TEL PUBL CORP, BASIC RES LABS, MUSASHINO, TOKYO 180, JAPAN

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.48.4883

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：4883 / 4886

页数：4

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