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Transparent and flexible carbon dots/polymer scaffold for deep UV photodetection applications

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2023, 33(4), pp.1133-1143
  • DOI : 10.1007/s42823-023-00490-7
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : January 11, 2023
  • Accepted : February 28, 2023
  • Published : June 1, 2023

Gopi Pavithra 1 Ponnusamy Kathirvel 1

1PSG College of Technology

Accredited

ABSTRACT

This work reports the fabrication of a flexible Photodetector (PD) using Carbon Dots (CDs)/Polymer composite for Deep UV (DUV) photodetection. The CDs have been prepared using a simple and inexpensive heating process. The syncretic studies reveal the disordered graphitic core with surface functional groups and the excitation-dependent character of CDs. The synthesized CDs are stabilized via Poly Vinyl Alcohol (PVA) through a synergistic effect and investigated for different compositions (2–10 weight %) of CDs. The CDs/PVA composites shows improved absorbance at 208 and 335 nm compared to pure CDs owing to the bonding between them. This advantageous property of high absorption and photo response in the DUV region is utilized by employing CDs/PVA composite as a photo-sensing layer on the ITO-coated PET substrate in the PD. The performance of the PD was measured under dark, short (254 nm) and long (365 nm) UV region. Among all the compositions, 4% CDs/PVA PD exhibits superior performance in terms of high photo-to-dark current ratio (IPh/Id), responsivity and detectivity. The PD functioning and other parameters are discussed in detail and reported.

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