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Highly Transparent and Surface-Plasmon-Enhanced Visible-Photodetector Based on Zinc Oxide Thin-Film Transistors with Heterojunction Structure

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Department of Materials Science and Engineering, National Chiao-Tung University, 1001 University Rd., Hsinchu 30010, Taiwan
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Department of Electronic Engineering, National Chin-Yi University of Technology, No. 57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung 41170, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2019, 12(21), 3639; https://doi.org/10.3390/ma12213639
Received: 27 September 2019 / Revised: 31 October 2019 / Accepted: 4 November 2019 / Published: 5 November 2019
(This article belongs to the Special Issue Advanced Nanoelectronic Materials)
Highly transparent zinc oxide (ZnO)-based thin-film transistors (TFTs) with gold nanoparticles (AuNPs) capable of detecting visible light were fabricated through spray pyrolysis on a fluorine-doped tin oxide substrate. The spray-deposited channel layer of ZnO had a thickness of approximately 15 nm, and the thickness exhibited a linear increase with an increasing number of sprays. Furthermore, the ZnO thin-film exhibited a markedly smoother channel layer with a significantly lower surface roughness of 1.84 nm when the substrate was 20 cm from the spray nozzle compared with when it was 10 cm away. Finally, a ZnO and Au-NP heterojunction nanohybrid structure using plasmonic energy detection as an electrical signal, constitutes an ideal combination for a visible-light photodetector. The ZnO-based TFTs convert localized surface plasmon energy into an electrical signal, thereby extending the wide band-gap of materials used for photodetectors to achieve visible-light wavelength detection. The photo-transistors demonstrate an elevated on-current with an increase of the AuNP density in the concentration of 1.26, 12.6, and 126 pM and reach values of 3.75, 5.18, and 9.79 × 10−7 A with applied gate and drain voltages. Moreover, the threshold voltage (Vth) also drifts to negative values as the AuNP density increases. View Full-Text
Keywords: zinc oxide-based thin-film transistors; gold-nanoparticles; phototransistors; spray pyrolysis; plasmonic energy detection zinc oxide-based thin-film transistors; gold-nanoparticles; phototransistors; spray pyrolysis; plasmonic energy detection
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Wang, C.-J.; You, H.-C.; Lin, K.; Ou, J.-H.; Chao, K.-H.; Ko, F.-H. Highly Transparent and Surface-Plasmon-Enhanced Visible-Photodetector Based on Zinc Oxide Thin-Film Transistors with Heterojunction Structure. Materials 2019, 12, 3639.

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