Eur. Phys. J. Appl. Phys.
Volume 38, Number 1, April 2007
|Page(s)||37 - 39|
|Section||Laser and Optics|
|Published online||22 February 2007|
Ultraviolet photoresponse properties of SrTiO3 single crystals
Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
2 Department of Mathematics and Physics, China University of Petroleum, Beijing 102249, P.R. China
3 International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, P.R. China
Accepted: 26 January 2007
Published online: 22 February 2007
We have observed ultraviolet photosensitive properties of SrTiO3 single crystals. The photoresponse signal reaches 7.6 mV under a bias voltage of 110 V and an on-sample energy of 250 nJ for a 15-ps-duration 355 nm laser pulse. A linear relationship is obtained to the peak signal as a function of bias without any saturation trend from 1 to 110 V. Ultrafast characteristic as a function of time was also presented with the rise time as short as 750 ps. Furthermore, a weak photoresponse was detected with a large bias of 2.5 kV under a 420-nm-wavelength laser pulse due to band edge tilting, and drop three orders of magnitude than that under the 355 nm laser pulse, indicating the setup consisting of SrTiO3 single crystal is suitable for detecting ultraviolet radiation.
PACS: 78.20.-e – Optical properties of bulk materials and thin films / 72.40.+w – Photoconduction and photovoltaic effects
© EDP Sciences, 2007
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