Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (10): 1042-1048.DOI: 10.15541/jim20160698

• Orginal Article • Previous Articles     Next Articles

Graphene Quantum Dots/CdS/CdSe Co-Sensitized Solar Cells

LIU Yong-Qiang1,2, HUANG Hao1,2, ZHAI Jin-Sheng1,2, MA Meng-Jun1,2, FAN Jia-Jie1,2   

  1. (1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; 2. International Centre for Designer Low-Carbon and Environmental Materials, Zhengzhou University, Zhengzhou 450001, China)
  • Received:2016-12-23 Revised:2017-02-16 Online:2017-10-20 Published:2017-09-21
  • About author:LIU Yong-Qiang. E-mail: 1015221794@qq.com
  • Supported by:
    National Natural Science Foundation of China (51402263, U1304514)

Abstract:

Using three-dimensional anatase TiO2 microspheres as light scattering overlayer and commercial TiO2 nanocrystalline as connecting underlayer, novel double-layered TiO2 films were prepared by a doctor blade method for quantum dots sensitized solar cell (QDSSC) application. The graphene quantum dots (GQDs) were introduced by dripping, and the CdS/CdSe quantum dots were deposited by continuous ion-layer adsorption (SILAR) method, respectively. The prepared quantum dots sensitized thin films were characterized by field emission scanning electron microscopy, transmission electron miscroscopy, X-ray diffraction, Uv-vis diffuse reflectance spectra, and fluorescence spectra. CdS/CdSe quantum dots sensitized and GQDs/CdS/CdSe co-sensitized solar cells were fabricated, respectively. And the effects of GQDs and CdS quantum dots with different deposition cycles on the microstructures and the photovoltaic performance of the double-layered TiO2 QDSSCs were investigated and discussed. The results revealed that the introduced GQDs and the CdS deposition cycle obviously influenced the optical properties of the double-layered TiO2 film. The electron transfer and charge-recombination process are also affected by the CdS deposition cycle and the introduced GQDs. Optimally, the conversion efficiency and photocurrent density of the TiO2/QGDs/CdS(4)/CdSe solar cell is 1.24% and 9.47 mA/cm2, respectively, which are higher than those (0.59% and 6.22 mA/cm2, respectively) of the TiO2/CdS(4)/CdSe cell. This is due to the effective electrons transport and reduced charge recombination within the co-sensitized cell.

 

Key words: graphene quantum dots (GQDs), CdS/CdSe quantum dots, TiO2 microspheres, co-sensitized solar cells

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