A LUMINESCENT SILICON NANOCRYSTAL COLLOID VIA A HIGH-TEMPERATURE AEROSOL REACTION

被引：441

作者：

LITTAU, KA ^{[1
]}

SZAJOWSKI, PJ ^{[1
]}

MULLER, AJ ^{[1
]}

KORTAN, AR ^{[1
]}

BRUS, LE ^{[1
]}

机构：

[1] AT&T BELL LABS, MURRAY HILL, NJ 07974 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 06期

关键词：

D O I：

10.1021/j100108a019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We describe a high-temperature aerosol apparatus for the synthesis of 3-8-nm, surface-oxidized Si crystallites. The particles are made by homogeneous gas-phase nucleation following pyrolysis of dilute disilane in He. The particles are collected as a robust ethylene glycol colloid, and characterized by transmission electron microscopy, X-ray powder Bragg scattering, IR, high-pressure liquid chromatography, and optical spectroscopy. The particles exhibit a shell structure, with a crystalline Si core, of bulk lattice constant, capped with an approximately 1.2-nm shell of silicon dioxide. After acidic reflux, the particles luminesce with 5% net quantum yield. As the Si core decreases to about 2 nm the emission shifts 0.5 eV above the bulk Si band pp. This red luminescence appears consistent with a predicted quantum size effect in crystalline silicon.

引用

页码：1224 / 1230

页数：7

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