CJCU

Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (2): 423.doi: 10.7503/cjcu20120376

• Physical Chemistry • Previous Articles     Next Articles

Preparation and Photoelectrical Properties of CuS/TiO2 Nanotube Heterojunction Arrays

KE Chuan1, CAI Fang-Gong1, YANG Feng1, CHENG Cui-Hua1,2, ZHAO Yong1,2   

  1. 1. Superconductivity and New Energy R & D Center(SRDC), Key Laboratory of Advanced Technology of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
    2. School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
  • Received:2012-04-18 Online:2013-02-10 Published:2013-01-21

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Abstract:

CuS/TiO2 nanotube heterojunction arrays were prepared by hydrothermal reaction. The surface morphology and crystalline phase of heterojunction arrays were characterized by field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD). The current-voltage curve of CuS/TiO2 nanotube heterojunction arrays reveals an obvious rectifying behavior. According to the results of surface photovoltage spectrum(SPS) and phase spectrum(PS), CuS/TiO2 nanotube heterojunction arrays show p-type semiconductor character and electrons aggregate at the surface in 376—600 nm, and n-type semiconductor character and holes aggregate at the surface in 300—376 nm. The surface photovoltage response is zero at 376 nm. The reason for difference aggregation properties in different wavelengths of heterojunction arrays is the competition result between interfacial electric filed of CuS/TiO2 and CuS/ITO. The photoelectrochemical property of CuS/TiO2 nanotube heterojunction arrays-base photoelectrochemical cell shows that 0.4% of photoelectricity conversion efficiency is achieved under 100 mW/cm2 simulated AM 1.5G sunlight.

Key words: CuS/TiO2 nanotube heterojunction array, Surface photovoltage spectrum, Phase spectrum, Interfacial electric field, Photoelectrochemical property

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