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Green synthesis of graphene quantum dots and the dual application of graphene quantum dots-decorated flexible MSM p-type ZnO device as UV photodetector and piezotronic generator

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Abstract

A novel method to synthesize graphene sheets and graphene quantum dots (GQDs) from agricultural waste is reported in this paper. The as-prepared GQDs were decorated on the antimony (Sb)-doped zinc oxide (ZnO) nanostructures to improve the opto-electrical properties of the photodetector. Morphological studies, elemental analysis, absorption and Raman spectroscopy studies were performed on the as-prepared graphene sheets and GQDs. A GQDs-decorated, p-type Sb-doped ZnO metal–semiconductor–metal (MSM) interdigitated UV photodetector was fabricated on a flexible ITO/PET substrate. Structural, morphological and elemental analyses were performed on the GQDs-decorated nanostructures. The Hall measurements show that the device exhibits p-type conductivity with hole concentration of 3 × 1019 cm−3 and Hall mobility of 2067 cm2 V−1 s−1. It is observed from the I–V studies that the Sb-doped ZnO MSM device with GQDs exhibits 103 times higher dark and photocurrents as compared to the device without GQDs decoration. The dynamic response is measured, and the turn-on (τon) and turn-off (τoff) times are found to be 3.67 and 12.26 s, respectively. The device also exhibited piezotronic dark potential on compression at a convex arc angle. Repeated compressions and relaxations were performed on the device and it behaved as a piezotronic generator.

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Acknowledgements

We extend our gratitude towards the INUP program offered by the Department of CeNSe, Indian Institute of Science (IISc), Bangalore, for providing the characterization facilities (SEM and XRD) required to complete this study. We would also like to thank the research center and Department of Nanoscience and Technology of Mount Carmel College, Bangalore, for providing us with lab facilities for the synthesis and fabrication of the device.

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Authors and Affiliations

  1. Department of Electronic Science, Bangalore University, Bengaluru, 560056, India

    Nazia Fathima & Jyothi Balakrishnan

  2. Department of Nanoscience and Technology, Mount Carmel College, Bengaluru, 560052, India

    N Pradeep

Authors
  1. Nazia Fathima
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  2. N Pradeep
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Correspondence to Nazia Fathima.

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Fathima, N., Pradeep, N. & Balakrishnan, J. Green synthesis of graphene quantum dots and the dual application of graphene quantum dots-decorated flexible MSM p-type ZnO device as UV photodetector and piezotronic generator. Bull Mater Sci 44, 33 (2021). https://doi.org/10.1007/s12034-020-02326-w

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  • DOI: https://doi.org/10.1007/s12034-020-02326-w

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