TY - JOUR
T1 - Interaction of surface acoustic waves and ultraviolet light in ZnO films
AU - Sharma, Parmanand
AU - Kumar, Sanjeev
AU - Sreenivas, K.
N1 - Funding Information:
The authors are thankful to Prof. Abhai Mansingh for fruitful discussions and the Department of Science and technology, Government of India, for funding the project.
PY - 2003/3
Y1 - 2003/3
N2 - 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.
AB - 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.
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U2 - 10.1557/JMR.2003.0069
DO - 10.1557/JMR.2003.0069
M3 - Article
AN - SCOPUS:0037662090
SN - 0884-2914
VL - 18
SP - 545
EP - 548
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 3
ER -