SYNTHESIS AND OPTICAL PROPERTIES OF CRYSTALLINE Si1-xGexOy NANORODS

Abstract

Crystalline Si 1-x Ge x O y nanorods were successfully synthesized by a chemical vapor deposition method using germanium as a starting material on Au -coated Si (111) substrate at ~ 1000°C in a flowing high-purity Ar atmosphere. Most of the nanorods have smooth surfaces, with diameters ranging from ~ 50 nm to 165 nm and lengths longer than several microns. Ultraviolet-visible absorption spectrum of the nanorods shows a maximum absorption wavelength at 203 nm. Photoluminescence spectrum of the nanorods exhibits an ultraviolet emission peak at 336 nm. The growth of the nanorods follows a vapor–liquid–solid mechanism.