Abstract
A solar-blind ultraviolet photodetector based on perovskite (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 (LSAT) single crystal has been fabricated. The Deep Ultra Violet (DUV)/Ultra Violet (UV) (200 versus 290 nm) ratio is more than three orders of magnitude under the applied bias voltage 200 V. Under illumination at 200 nm, the responsivity of this ultraviolet photodetector reaches 4 mA/W at 200 V bias. The corresponding quantum efficiency and detectivity are 2.76% and 1×1011 cm⋅Hz0.5/W, respectively. The ultrafast response with a rise time of 563 ps and full width half maximum (FWHM) of 1.085 ns is obtained. The high sensitivity, ultrafast response speed, and good signal-to-noise ratio demonstrate that the LSAT photodetector could be a promising candidate as the solar-blind ultraviolet photodetector.
Highlights
IntroductionUltraviolet (UV) photodetectors have attracted much attention for their wide applications in the fields of communication, flame detection, missile tracking, ozone holes monitoring, corona detection, and chemical or biological agent sensing.[1,2,3,4] UV photodetectors consist of visible-blind (below 400 nm) ultraviolet photodetector[5,6] and solar-blind ultraviolet (below 280 nm) photodetector.[7,8] Because most photons in the wavelength shorter than 280nm have been strongly absorbed by the stratospheric ozone layer,[9] solar-blind ultraviolet photodetectors, compared to visible-blind ultraviolet photodetectors, show superior advantages with lower false alarm rate and higher sensitivity under sun or room illumination
The solar-blind photodetector based on a LSAT single crystal has been fabricated and the photodetector characteristic has been investigated
The photodetector exhibits a low dark current of 5.82 pA, an ultrafast response signal with a rise time of 563 ps, and detectivity D* of 1×1011 cmHz0.5/W, under the illumination of a light with wavelength 212 nm
Summary
Ultraviolet (UV) photodetectors have attracted much attention for their wide applications in the fields of communication, flame detection, missile tracking, ozone holes monitoring, corona detection, and chemical or biological agent sensing.[1,2,3,4] UV photodetectors consist of visible-blind (below 400 nm) ultraviolet photodetector[5,6] and solar-blind ultraviolet (below 280 nm) photodetector.[7,8] Because most photons in the wavelength shorter than 280nm have been strongly absorbed by the stratospheric ozone layer,[9] solar-blind ultraviolet photodetectors, compared to visible-blind ultraviolet photodetectors, show superior advantages with lower false alarm rate and higher sensitivity under sun or room illumination. Solar-blind ultraviolet photodetector based on wide bandgap semiconductors, such as diamond,[1,2,10] BN, AlGaN,[7] Ga2O3,13–15 have been widely investigated. Perovskite oxides with wideband gap, which have strong stability against harsh environment,[16,17] have attracted much attention, due to their excellent photoelectric property and potential ultrafast performance.[18,19,20,21,22]
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