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Low-noise visible-blind photodetectors based on Sr Ti O 3 single crystal with transparent indium tin oxide electrode as window

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Abstract

We fabricate low-noise visible-blind ultraviolet photodetectors of indium tin oxide/SrTiO3/Ag (ITO/STO/Ag) based on the properties of STO bandgap excitation and the conductance of ITO thin film. The ITO films are epitaxially grown on STO wafers as electrodes and windows of the photodetectors, simultaneously. The photodetectors have low noise and very good electromagnetic shielding. The dark current is as low as 270pA even at a 200V bias. The peak responsivity reaches to 30mA/W at the wavelength of 360nm. From the experimental results, the same ideas can be generalized to develop visible-blind and solar-blind UV photodetectors based on wide bandgap materials, such as LaAlO3, LiNbO3, LiTaO3, BaTiO3, ZnO, MgO, and ZrO2.

© 2010 Optical Society of America

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