Synthesis and Characterization of Au/ Sb 2 O 3 Ultrathin nanosheet/Au as a High-Performance UV-Photodetector
DOI:
https://doi.org/10.25156/ptj.v12n1y2022.pp155-162Keywords:
Sb 2 O 3, Ultrathin nanosheets, Au/Sb 2 O 3 /Au, MSM UV-photodetectorAbstract
Ultrathin antimony trioxide (Sb 2 O 3 ) was synthesized on ITO substrate by solvothermal method using ethanol as a
solvent. The structure, morphological variations and optical properties of the as-prepared sample were characterized.
The results indicated that the homogeneously grown sheet of cubic phase of ultrathin Sb 2 O 3 have elliptical cross
section with thickness of 20 nm and diameter of 400-500 nm. Further, an ultraviolet (UV) performance
photodetector based on the (Au/Sb 2 O 3 /Au) was fabricated and examined. The measured Current Voltage (IV) curves
in the dark and under illumination (UV-395 nm) of different intensities indicate the presence of Schottky barrier at
the interfaces between Sb 2 O 3 and Au-electrodes. Photocurrent values of 2.32, 16.5, and 25.58 μA were obtained for
intensities of 4, 8 and 12 mW/cm 2 , respectively at bias voltage of +3V, as compared to dark current of 0.78μA.
Sensitivity and responsivity values of 40.04 and 6.294W/A were recorded. The current-time (I-T) graph was utilized
to derive the response and recovery times of the sensor under chopped UV-laser at different power intensities. The
sensor exhibited fast response and recovery times of 113.6 ms and 67.2 ms, respectively, making this a high-
performance sensor. This study demonstrates that ultrathin Sb 2 O 3 nanosheet can be very useful to develop simple
and high-performance UV sensors in different commercial fields and industries in the future.
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