Blue Luminescent Properties of Silicon Nanowires Grown by a Solid-Liquid-Solid Method

• Published in: Chinese physics letters Vol. 27; no. 5; pp. 234 - 236
• Main Author: 彭英才 范志东 白振华 赵新为 娄建忠 程旭
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.05.2010
• Subjects: Crystal defects; Crystal structure; Luminescence; Nanowires; Oxides; Shells; Silicon substrates; Wavelengths; 光致发光性能; 氧化物; 波长范围; 硅纳米线; 蓝色发光; 金属催化剂
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/5/057305

Silicon nanowires （SiNWs） were grown directly from n-（111） single-crystal silicon （c-Si） substrate based on a solid- liquid-solid mechanism, and Au film was used as a metallic catalyst. The room temperature photoluminescence properties of SiNWs were observed by an Xe lamp with an exciting wavelength of 350 nm. The results show that the SiNWs exhibit a strongly blue luminescent band in the wavelength range 40-480 nm at an emission peak position of 420 nm. The luminescent mechanism of SiNWs indicates that the blue luminescence is attributed to the oxygen-related defects, which are in SiOx amorphous oxide shells around the crystalline core of SiNWs.