Photoconductivity and photocatalytic activity of ZnO thin films grown via thermal oxidation

J. C. Moore; R. Louder; L. R. Covington; R. Stansell

doi:10.1117/12.906227

29 February 2012 Photoconductivity and photocatalytic activity of ZnO thin films grown via thermal oxidation

J. C. Moore, R. Louder, L. R. Covington, R. Stansell

Proceedings Volume 8263, Oxide-based Materials and Devices III; 82631M (2012) https://doi.org/10.1117/12.906227
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

We have investigated the photoconductivity and photocatalytic properties of polycrystalline zinc oxide (ZnO) films grown on c-plane sapphire substrates. Zinc-metal films where grown on sapphire substrates via dc-sputter deposition at room temperature with subsequent thermal annealing in air at 300°C, 600°C, 900°C, and 1200°C. Photoluminescence spectra indicate four emission bands: excitonic ultraviolet, blue, and deep-level green and yellow emission. The ratio of deep-level green emission to UV excitonic emission was observed to decrease with decreasing annealing temperature from 1200°C to 300°C. Metal-semiconductor-metal (MSM) Al:ZnO:Al planar UV photodetectors where fabricated via sputter deposition of aluminum ohmic contacts on the resulting ZnO films. Decreasing photocurrent is seen for increasing annealing temperature, which is consistent with PL studies. A responsivity of ~0.1 A/W was observed. Photocatalytic activity follows half-order reaction kinetics as determined by photodegradation of Rhodamine B.

Citation Download Citation

J. C. Moore, R. Louder, L. R. Covington, and R. Stansell "Photoconductivity and photocatalytic activity of ZnO thin films grown via thermal oxidation", Proc. SPIE 8263, Oxide-based Materials and Devices III, 82631M (29 February 2012); https://doi.org/10.1117/12.906227

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available