ZnO/conducting polymer bilayer via sequential spin-coating for enhanced UV sensing
- Authors
- Park, T.; Choi, H.W.; Hur, J.
- Issue Date
- Sep-2020
- Publisher
- Springer
- Keywords
- Bilayer; PEDOT: PSS; Spin Coating; UV Sensor; Zinc Oxide Nanoparticles
- Citation
- Korean Journal of Chemical Engineering, v.37, no.9, pp.1616 - 1622
- Journal Title
- Korean Journal of Chemical Engineering
- Volume
- 37
- Number
- 9
- Start Page
- 1616
- End Page
- 1622
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/78233
- DOI
- 10.1007/s11814-020-0563-9
- ISSN
- 0256-1115
- 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. © 2020, The Korean Institute of Chemical Engineers.
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