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Interaction of surface acoustic waves and ultraviolet light in ZnO films

Published online by Cambridge University Press:  31 January 2011

Parmanand Sharma ,
Sanjeev Kumar  and
K. Sreenivas
Parmanand Sharma*
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi–110007, India
Sanjeev Kumar
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi–110007, India
K. Sreenivas
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi–110007, India
*
a)Address all correspondence to this author. Present address: Department of Materials Science-Tmfy-MSE, Royal Institute of Technology, S-100 44 Stockholm, Sweden. e-mail: [email protected]
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Abstract

The frequency response of a 37 MHz bulk LiNbO3 surface acoustic wave (SAW) filter with a 200-nm-thick ZnO overlayer exhibited a downshift in the frequency with ultraviolet (UV) light due to acoustoelectric interactions between the photo-generated carriers in the semiconducting ZnO and the surface acoustic waves. In contrast, a 36 MHz ZnO thin film SAW delay-line with insulating ZnO films exhibited an upshift in the frequency. The response was more pronounced at higher harmonics (130–315 MHz) and was attributed to changes in the elastic/dielectric properties in the upper surface layer of ZnO. A linear change in the frequency with UV intensity shows immense applicability for wireless ultraviolet sensor applications.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 18 , Issue 3 , March 2003 , pp. 545 - 548
Copyright
Copyright © Materials Research Society 2003

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