A Flexible Self‐Powered UV Photodetector and Optical UV Filter Based on β‐Bi 2 O 3 /SnO 2 Quantum Dots Schottky Heterojunction

Praveen, Shanigaram and Veeralingam, Sushmitha and Badhulika, Sushmee (2021) A Flexible Self‐Powered UV Photodetector and Optical UV Filter Based on β‐Bi 2 O 3 /SnO 2 Quantum Dots Schottky Heterojunction. Advanced Materials Interfaces. p. 2100373. ISSN 2196-7350

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Recently reported ultraviolet (UV) detectors majorly focus on exploration of photodetection properties like photon absorption and electron-hole pair generation to improve the photoresponsivity. However, UV sensors also have a potential advantage of monitoring the excessive UV exposure on skin. In this work, bismuth oxide/SnO2 quantum dots (QDs) vertical-junction-based self-powered UV photodetector and optical UV filter are demonstrated. β-Bi2O3 nanofibers are synthesized via electrospinning technique and SnO2 QDs are synthesized using a facile, single step hydrothermal process. Detailed morphological studies reveal the formation of 1D-Bi2O3 and 0D-SnO2. The fabricated self-powered Bi2O2/SnO2-based p–n heterojunction device exhibits a maximum responsivity of 62.5 µA W−1 and specific detectivity (D*) of 4.5 × 109 Jones attributing to the high absorption coefficient of β-Bi2O2 nanofibers and SnO2 QDs in the UV region. Further, the 1D β-Bi2O3 nanofibers and 0D SnO2 QDs are coated onto disposable cloth substrate to fabricate the UV optical filter which exhibits an exceptional ultraviolet protection factor of 159 and the photodetector device demonstrates high stability and reproducibility even after 1000 bending cycles. The strategy outlined here paves the way for development of bifunctional, cost-effective design and construction of wearable UV sensors and protective devices for advanced nano-electronic applications.

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IITH Creators:
IITH CreatorsORCiD
Praveen, ShanigaramUNSPECIFIED
Veeralingam, SushmithaUNSPECIFIED
Badhulika, SushmeeUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Absorption co-efficient; Cost effective design; Electron-hole pair generation; Electrospinning techniques; Heterojunction devices; Hydrothermal process; Specific detectivity; Ultraviolet protection factors;Cost effectiveness; Heterojunctions; Nanocrystals; Nanoelectronics; Nanofibers; Photodetectors; Photons; Semiconductor quantum dots; Ultraviolet devices; Wearable sensors
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 05 Aug 2021 04:27
Last Modified: 05 Aug 2021 04:27
URI: http://raiith.iith.ac.in/id/eprint/8668
Publisher URL: http://doi.org/10.1002/admi.202100373
OA policy: https://v2.sherpa.ac.uk/id/publication/27219
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