Optical properties of nanostructured ZnO crystal synthesized by pulsed-laser ablation

✍ Scribed by K. Sakai; S. Oyama; K. Noguchi; A. Fukuyama; T. Ikari; T. Okada

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 446 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2007.09.006

✦ Synopsis

The optical properties of ZnO nanorods and nanowires grown by a newly developed nanoparticle-assisted pulsed-laser deposition were studied by using photoluminescence (PL) and a surface photovoltage (SPV) spectroscopy. SPV spectroscopy can detect an optical absorption spectrum by the illumination-induced change in the surface potential due to the drift, accumulation, and recombination of photoexcited carriers. Thus, SPV spectroscopy is expected to be a powerful tool for nanostructured semiconductors because the light scattering at the crystal boundaries cannot affect the observed signal. In this paper, the optical-absorption edge including exciton formation and the presence of a defect level induced by copper impurities in ZnO nanorods and nanowires crystals are discussed.