Fabrication of CuInS2 Sensitized TiO2 Nanorod Arrays for Photovoltaic Devices

doi:10.3724/SP.J.1077.2012.00049

Abstract

Abstract:

Vertically oriented single-crystalline TiO₂ nanorod arrays sensitized with CuInS₂ quantum dots (QDs) were synthesized directly on fluorine-doped tin oxide (FTO) substrates by two-step solvothermal method. The as-prepared nanostructure assembly was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicated that CuInS₂ QDs were uniformly covered on the surface of the single-crystalline TiO₂ nanorods. Ultraviolet visible (UV-Vis) absorption spectra showed that the absorbance of the TiO₂/CuInS₂ nanocomposite film was extended to the visible region. Under illumination of simulated AM 1.5 G (100 mW/cm²) at one sun intensity, the QD sensitized solar cells (QD-SSCs) assembled with FTO/TiO₂/CuInS₂ photoelectrodes exhibited an open-circuit voltage of 0.29 V and a short-circuit current density of 0.15 mA/cm².

Key words: TiO₂ nanorods array, CuInS₂, solvothermal, photo-electric conversion, quantum dots (QDs)

CLC Number:

TB383

FAN Jun-Qi, ZHOU Zheng-Ji, ZHOU Wen-Hui, WU Si-Xin. Fabrication of CuInS₂ Sensitized TiO₂ Nanorod Arrays for Photovoltaic Devices[J]. Journal of Inorganic Materials, 2012, 27(1): 49-53.

Figures/Tables 5

Fig. 1 XRD patterns of TiO2 / CuInS2 nanorod arrays

Fig. 2 SEM images of TiO2/CuInS2 nanorod arrays

Fig. 3 UV-Vis absorbance spectra of TiO2/CuInS2 composite nanorod array film (a) TiO2, (b) TiO2/CuInS2 composite nanorod array film

Fig. 4 Photocurrent-voltage characteristics of TiO2/CuInS2 solar cells

Fig. 5 Schematic diagram showing the charge-transfer processes for the CuInS2/TiO2 heterostructure

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Fabrication of CuInS₂ Sensitized TiO₂ Nanorod Arrays for Photovoltaic Devices

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