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ZnO/conducting polymer bilayer via sequential spin-coating for enhanced UV sensing

Korean Journal of Chemical Engineering volume 37, pages 1616–1622 (2020)Cite this article

Abstract

Zinc oxide (ZnO) has been widely investigated as an important ultraviolet (UV) sensing material in view of its wide band gap (~3.4 eV). However, the fabrication of continuous thin films of ZnO generally requires complex, time-consuming, and expensive processes, such as sputtering and atomic layer deposition. Herein, we demonstrate a bilayer film consisting of a conducting polymer and ZnO nanoparticles sequentially deposited using a simple, rapid, and inexpensive two-step spin-coating process. In this approach, it is not necessary to have a continuous ZnO nanoparticle film as the active layer, because the conducting polymer deposited under the ZnO nanoparticles acts as a conductive and continuous supporting layer for the particles. Poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT: PSS) is used as the auxiliary layer to promote the efficient transport of photo-carriers generated from ZnO nanoparticles under UV light. As a result, under UV light (365 nm), photocurrents obtained from a ZnO/PEDOT: PSS bilayer film are significantly higher (∼20 times) than that from a ZnO layer for a given voltage bias. The photoelectric performance can be further tuned by controlling the speed of spin-coating in the deposition of ZnO nanoparticles. The stability and photo response (rise and decay time) of the ZnO/PEDOT: PSS bilayer film under the repeated on-off condition are also reported.

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Acknowledgements

This research was supported by the Korea Electric Power Corporation (Grant number: R18XA02). This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20194030202290). We thank the Smart Materials Research Center for IoT at Gachon University for its instrumental support (SEM).

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi, 13120, Korea

    Taehyun Park & Jaehyun Hur

  2. Department of Electrical Engineering, Gachon University, 1342 Seongnam Daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Korea

    Hyung Wook Choi

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  1. Taehyun Park
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Correspondence to Jaehyun Hur.

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Park, T., Choi, H.W. & Hur, J. ZnO/conducting polymer bilayer via sequential spin-coating for enhanced UV sensing. Korean J. Chem. Eng. 37, 1616–1622 (2020). https://doi.org/10.1007/s11814-020-0563-9

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  • DOI: https://doi.org/10.1007/s11814-020-0563-9

Keywords

  • Zinc Oxide Nanoparticles
  • PEDOT: PSS
  • Bilayer
  • Spin Coating
  • UV Sensor