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Electrical charge conductivity behavior of electrodeposited Cu2O/ZnO heterojunction thin films on PET flexible substrates by impedance spectroscopy analysis

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Abstract

The bottom-up self-assembly Cu2O/ZnO heterojunction thin films electrodeposited on indium tin oxide flexible substrate (polyethylene terephthalate, PET) have been investigated by impedance spectroscopy. It is used to study the electric conductivity of the Cu2O/ZnO heterojunction thin films combined electric modulus and impedance plots. The electric modulus and impedance as a function of the frequency analysis show the distribution of the relaxation times due to the hopping of charge carriers among defects in the Cu2O/ZnO heterojunction thin films. The values of activation energies derived from the electric modulus and impedance are found to be 0.42 and 0.40 eV, respectively, which is close to the activation energy (0.28 eV) of dc electrical conductivity and activation energy of ac conductivity (0.45–0.14 eV at the range of 100 Hz–1 MHz) in the temperature range over 303–423 K.

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Acknowledgements

This work was supported by National Nature Science Foundation (51172187), the SPDRF (20116102130002), the Doctoral fund of Ministry of Education of China(20116102120016), 111 Program (B08040) of MOE, Xi’an Science and Technology Foundation (CX1261-2, CX1261-3, XA-AM-201003), China Postdoctoral Science Foundation(20100481360), Natural Science Foundation of Shaanxi Province (2011JM6016), Shaanxi Province Foundation for Returned Scholars, High-level start-up Funding of NWPU, Fundamental Research Foundation (NPU-FFR-JC201232) of China.

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  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Qiang Li, Mengmeng Xu, Huiqing Fan, Hairong Wang, Biaolin Peng, Changbai Long & Yuchun Zhai

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  1. Qiang Li
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  2. Mengmeng Xu
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Correspondence to Qiang Li.

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Li, Q., Xu, M., Fan, H. et al. Electrical charge conductivity behavior of electrodeposited Cu2O/ZnO heterojunction thin films on PET flexible substrates by impedance spectroscopy analysis. J Mater Sci 48, 3334–3340 (2013). https://doi.org/10.1007/s10853-012-7008-8

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