J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (2): 123-127.DOI: 10.1016/j.jmst.2012.12.019

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Preparation of Cauliflower-like ZnO Films by Chemical Bath Deposition:Photovoltaic Performance and Equivalent Circuit of Dye-sensitized Solar Cells

Yuqiao Wang1), Xia Cui1), Yuan Zhang2), Xiaorui Gao3), Yueming Sun1)   

  1. 1) School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189,China
    2) School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
    3) School of Science, Hebei University of Engineering, Handan 056038, China
  • Received:2012-05-24 Revised:2012-10-11 Online:2013-02-28 Published:2013-03-01
  • Contact: Yuqiao Wang,Yueming Sun
  • Supported by:

    National Basic Research Program of China (973 Program, No. 2013CB932902), the National Natural Science Foundation of China (No. 21173042), the National Natural Science Foun­dation of Jiangsu (No. BK201123694) and Hebei (No. B2012402006), the Jiangsu Key Laboratory of Environmental Material and Environmental Engineering (No. JHCG201012) and the Foundation of Southeast of University (Nos. 3212001102 and 3212002205).

Abstract:

The uniform cauliflower-like ZnO films were deposited on the conducting substrate by a chemical bath deposition in urea/water solution. The film structure and morphology were characterized by X-ray diffraction, thermo­gravimetric differential thermal analysis, energy dispersive spectroscopy, selected area electron diffraction, field emission scanning electron microscopy and high resolution transmission electron microscopy. The average diameter of ZnO nanoparticles and the petal thickness were 25 nm and 8 mm, respectively. Dye-sensitized solar cells based on the cauliflower-like ZnO film electrode showed the short-circuit current density of 6.08 mA/cm2, the open-circuit photovoltage of 0.66 V, the fill factor of 0.55 and the overall conversion efficiency of 2.18%. The equivalent circuit of cells based on the ZnO film electrodes was measured by the electrochemical impedance spectroscopy. Furthermore, the analysis of equivalent circuit provided the relationship between the cell performance and the interfacial resistance, such as the shunt resistance and the series resistance.

Key words: ZnO, Solar cell, Bath deposition, Electrochemical impedance, Equivalent circuit