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Research on FTO/CBD-CdS: Cl thin film photodetector with a vertical structure

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A Correction to this article was published on 19 August 2021

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Abstract

In this work, CdS thin films were deposited on glass/fluorine-doping tin oxide (FTO) substrates by low-cost chemical bath deposition (CBD), followed by annealing with CdCl2-doping (Cl-doping) to fabricate resistive-type photodetectors (PDs) with a vertical structure of glass/FTO/CBD-CdS:Cl/electrode. The effect of annealing with Cl-doping (AwCl) on the various properties of films and the photodetection performance of PDs were systematically characterized by special testing methods. The results revealed that the surface morphology and crystal structure of CBD-CdS:Cl films were improved, accompanied by an enhancement of hexagonal phase (002) crystal plane (wurtzite structure), and the optical bandgap of films can be adjusted between 2.43 and 2.26 eV while the electron activation energy of the films was reduced from 75.9 to 10.3 meV after AwCl. Furthermore, the light responsivity of CBD-CdS:Cl PDs were 0.57, 0.59 and 1.67 A/W under 365, 400 and 530 nm illumination at a bias of −2.0 V, respectively, and the detectivity of photons at corresponding wavelengths were 3.7 × 108, 3.9 × 108 and 1.08 × 109 Jones. Meanwhile, the PDs showed optimized repeatability and improved sensitivity under periodic illumination. The above results demonstrated that the CBD-CdS:Cl PDs with a vertical structure developed in this work had good detection performance at certain characteristic wavelengths.

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Acknowledgements

The authors would acknowledge the cooperation project supported by Sichuan University and Luzhou City (2019CDLZ-15) and Sichuan University and Dazhou City (2020CDDZ-04), Science and Technology Achievement Transfer and Transformation Demonstration Project of Sichuan Province (2021ZHCG0004), Laboratory Technology Project of Sichuan University, Research Project of New Century Education and Teaching Reform Project (9th) of Sichuan University, the Science and Technology Project supported by the Sichuan Provincial Human Resources and Social Security Department (Grant No. 2018145-76) and the Fundamental Research Funds for Central Universities.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, 24 South Section 1, Yihuan Road, Wuhou District, Chengdu, 610064, Sichuan Province, China

    Junlin Zhang, Yunfan Wang, Biao Zhou, Hongyuan Cao, Xiutao Yang, Bing Li, Jingquan Zhang, Lianghuan Feng & Guanggen Zeng

  2. CQC-Trusted Testing Technology CO., LTD, Nanjing, 210023, China

    Zhengxiang Zhong

  3. Department of Energy Materials, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, 21934, Egypt

    Mohsen Ghali

  4. Physics Department, Faculty of Science, Kafrelsheikh University, 33516, Kafrelsheikh, Egypt

    Mohsen Ghali

  5. Department of Solar Energy, Institute for Energy Technology (IFE), 2027, Kjeller, Norway

    Smagul Karazhanov

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  1. Junlin Zhang
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Zhang, J., Wang, Y., Zhou, B. et al. Research on FTO/CBD-CdS: Cl thin film photodetector with a vertical structure. Appl. Phys. A 127, 560 (2021). https://doi.org/10.1007/s00339-021-04704-5

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