Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (09): 2575-2580.doi: 10.3866/PKU.WHXB20100930

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Solution Based Synthesis of ZnO/CdS Composite Nanorod Array Film and Its Photoelectric Properties

FU Dong-Wei, CHENG Ke, PANG Shan, DU Zu-Liang   

  1. Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004,Henan Province, P. R. China
  • Received:2010-03-24 Revised:2010-05-25 Published:2010-09-02
  • Contact: DU Zu-Liang E-mail:zld@henu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20773103,90306010,10874040).

Abstract:

Well-aligned ZnO/CdS composite nanorod array film was grown on an indium tin oxide (ITO) substrate by two-step chemical solution deposition method. The effects of CdS deposition time on the crystal structure, morphology, and photoelectric performance of the ZnO/CdS composite film were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible absorption spectroscopy (UV-Vis), photoluminescence spectroscopy (PL), and surface photovoltage spectroscopy (SPS). Results showed that the absorbance of the composite film extended into the visible region compared with the bare ZnO nanorod arrays. SPS also showed a new response region corresponding to the absorption spectrum. This result indicated a remarkable photoelectric conversion efficiency improvement in the visible region. We also found that the SPS response intensity of the composite film decreased gradually above 383 nmwith an increase in CdS deposition time. However, the SPS response intensity increased below 383 nm. We interpreted this phenomenon using two distinct photoinduced charge generation and transfer mechanisms.

Key words: ZnO/CdS nanorod array, Solution deposition, Surface photovoltage spectrum, Photo-electric property, Charge transfer process

MSC2000: 

  • O649