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Microstructure, wettability and electrical properties of n-ZnO/ZnO-SL/p-Cu2O heterojunction

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Abstract

ZnO/ZnO-SL/Cu2O heterojunction was successfully fabricated on Cu foil by hydrothermal and sol–gel method. Crystalline phase, surface morphology and photoluminescence spectrum of the heterojunction were measured by X-ray diffraction, scanning electronic microscopy and fluorescence spectrometer, respectively. Contact angles of ZnO thin films were measured using a contact angle apparatus. The current–voltage characteristics of heterojunction in dark were investigated at room temperature. The results indicated that the heterojunction was composed of Cu2O phase and ZnO phase. The post-heat temperature of 250 °C was beneficial to preferred growth of ZnO thin film along the c-axis direction. The Sample 2 was composed of the uniform, compact and vertically aligned ZnO nanorods and has the most obvious hydrophobic-to-hydrophilic transition. The transport characteristics of the Sample 2 may be related to the space-charge-limited current in region II and a trapped-charge-limited current in region III.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (Nos. 51472003, 51272001, 51102072, 21201052), Natural Science Foundation of Anhui Higher Education Institution of China (No. KJ2012Z336, KJ2013A224), Funds for “136” Talent of Hefei Normal University (No. 2014136KJB03).

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Authors and Affiliations

  1. School of Electronic and Information Engineering, Hefei Normal University, Hefei, 230601, China

    Min Zhao, Li Cao, Yue Sun, Jianguo Lv, Fengjiao Shang, Sicong Mao, Yaoyao Jiang, Jinhua Xu, Feng Wang, Zhitao Zhou & Yiyong Wei

  2. School of Physics and Material Science, Anhui University, Hefei, 230039, China

    Gang He, Miao Zhang, Xueping Song & Zhaoqi Sun

Authors
  1. Min Zhao
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  2. Li Cao
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  3. Yue Sun
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  4. Jianguo Lv
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  6. Sicong Mao
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  7. Yaoyao Jiang
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  9. Feng Wang
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  10. Zhitao Zhou
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  12. Gang He
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  13. Miao Zhang
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  14. Xueping Song
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  15. Zhaoqi Sun
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Corresponding authors

Correspondence to Jianguo Lv, Gang He or Zhaoqi Sun.

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Zhao, M., Cao, L., Sun, Y. et al. Microstructure, wettability and electrical properties of n-ZnO/ZnO-SL/p-Cu2O heterojunction. Appl. Phys. A 120, 335–340 (2015). https://doi.org/10.1007/s00339-015-9191-3

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  • DOI: https://doi.org/10.1007/s00339-015-9191-3

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