Size-dependent optical properties of silicon nanocrystals

被引：42

作者：

Soni, RK ^{[1
]}

Fonseca, LF ^{[1
]}

Resto, O ^{[1
]}

Buzaianu, M ^{[1
]}

Weisz, SZ ^{[1
]}

机构：

[1] Univ Puerto Rico, Dept Phys, Rio Piedras, PR 00931 USA

来源：

JOURNAL OF LUMINESCENCE | 1999年 / 83-4卷

基金：

美国国家航空航天局;

关键词：

silicon nanocrystals; Si-SiO2; film; photoluminescence; Raman scattering; quantum confinement;

D O I：

10.1016/S0022-2313(99)00096-4

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have synthesized green and red luminescent silicon nanocrystals in a SiO2 matrix by RF co-sputtering on a quartz substrate. The transmission coefficient measurements were used to estimate the nanocrystal size distribution. The size distribution reveals peaks in the range 1.1-2.6 nm with a long tail towards the larger size. As the nanocrystal size reduces photoluminescence spectrum shifts from red to green wavelengths. The measured PL emission energy is in agreement with the corrected LDA calculations. With decreasing nanocrystal size, the phonon Raman spectra exhibit softening accompanied with increasing asymmetrical broadening. The observed line shape is explained by considering phonon confinement in a spherical nanocrystal. The major contribution to the phonon line shape comes from those nanocrystals that favor resonance interaction with either incoming or outgoing photon. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：187 / 191

页数：5

共 11 条

[1] THEORETICAL ASPECTS OF THE LUMINESCENCE OF POROUS SILICON [J].