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Quantum dot-sensitized solar cells having 3D-TiO2 flower-like structures on the surface of titania nanorods with CuS counter electrode.

Buatong N, Tang IM, Pon-On W - Nanoscale Res Lett (2015)

Bottom Line: Using CuS as the counter electrode instead of Pt offers the best performance and leads to an increase in the conversion efficiency (η).The efficiency of the CdS/CdSe/ZnS QD-loaded FTiR assembling CuS counter electrode cell improved from η = 2.715% (Voc = 0.692 V, Jsc = 5.896 mA/cm(2), FF = 0.665) to η = 0.703% (Voc = 0.665 V, Jsc = 2.108 mA/cm(2), FF = 0.501) for the QD-loaded FTiR assembling Pt counter electrode cell.These studies reveal a synergistically beneficial effect on the solar-to-current conversion of these QD-sensitized solar cells when a CuS counter electrode is used instead of the usual Pt counter electrode.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Lat Yao Chatuchak, Bangkok, 10900 Thailand.

ABSTRACT
The photovoltaic performance of a quantum dot (QD)-sensitized solar cell consisting of CdS/CdSe/ZnS QDs loaded onto the surface of the three-dimensional (3D) flower-like TiO2 structure grown on an array (1D) of TiO2 nanorods (FTiR) is studied. The flower-like structure on the rod-shaped titania was synthesized using a double-step hydrothermal process. The FTiR array exhibited a 3D/1D composite structure with a specific surface area of 81.87 m(2)/g. Using CuS as the counter electrode instead of Pt offers the best performance and leads to an increase in the conversion efficiency (η). The efficiency of the CdS/CdSe/ZnS QD-loaded FTiR assembling CuS counter electrode cell improved from η = 2.715% (Voc = 0.692 V, Jsc = 5.896 mA/cm(2), FF = 0.665) to η = 0.703% (Voc = 0.665 V, Jsc = 2.108 mA/cm(2), FF = 0.501) for the QD-loaded FTiR assembling Pt counter electrode cell. These studies reveal a synergistically beneficial effect on the solar-to-current conversion of these QD-sensitized solar cells when a CuS counter electrode is used instead of the usual Pt counter electrode.

No MeSH data available.


UV–vis absorptive spectra of the photoanodes.
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Fig6: UV–vis absorptive spectra of the photoanodes.

Mentions: The UV–vis absorption spectra of the CdS/CdSe/ZnS QD-sensitized photoelectrodes made with FTiR substrates are seen in Figure 6. It is obvious that the light absorption is shifted to longer wavelengths (red shift). The spectrum indicates that incident photons of lower energies can be utilized by the QDSSCs with the CdS/CdSe/ZnS QDs. The UV–vis spectra exhibits a cut-off edge of the nanorod single-layer film spectrum at around 350 nm, which corresponds to a band gap of 3.54 eV, which is much larger than that of bulk rutile TiO2 (3.02 eV). This can be attributed to the quantum size effect of the small nanorods. The other peaks at approximately 400 nm (approximately 3.1 eV) are due to the larger size of flower blossom-like structure particles. The adsorption of incident light at nearly 400 and 535 nm in the UV–vis spectra is due to the light absorption by the CdS/CdSe/ZnS QDs.Figure 6


Quantum dot-sensitized solar cells having 3D-TiO2 flower-like structures on the surface of titania nanorods with CuS counter electrode.

Buatong N, Tang IM, Pon-On W - Nanoscale Res Lett (2015)

UV–vis absorptive spectra of the photoanodes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385307&req=5

Fig6: UV–vis absorptive spectra of the photoanodes.
Mentions: The UV–vis absorption spectra of the CdS/CdSe/ZnS QD-sensitized photoelectrodes made with FTiR substrates are seen in Figure 6. It is obvious that the light absorption is shifted to longer wavelengths (red shift). The spectrum indicates that incident photons of lower energies can be utilized by the QDSSCs with the CdS/CdSe/ZnS QDs. The UV–vis spectra exhibits a cut-off edge of the nanorod single-layer film spectrum at around 350 nm, which corresponds to a band gap of 3.54 eV, which is much larger than that of bulk rutile TiO2 (3.02 eV). This can be attributed to the quantum size effect of the small nanorods. The other peaks at approximately 400 nm (approximately 3.1 eV) are due to the larger size of flower blossom-like structure particles. The adsorption of incident light at nearly 400 and 535 nm in the UV–vis spectra is due to the light absorption by the CdS/CdSe/ZnS QDs.Figure 6

Bottom Line: Using CuS as the counter electrode instead of Pt offers the best performance and leads to an increase in the conversion efficiency (η).The efficiency of the CdS/CdSe/ZnS QD-loaded FTiR assembling CuS counter electrode cell improved from η = 2.715% (Voc = 0.692 V, Jsc = 5.896 mA/cm(2), FF = 0.665) to η = 0.703% (Voc = 0.665 V, Jsc = 2.108 mA/cm(2), FF = 0.501) for the QD-loaded FTiR assembling Pt counter electrode cell.These studies reveal a synergistically beneficial effect on the solar-to-current conversion of these QD-sensitized solar cells when a CuS counter electrode is used instead of the usual Pt counter electrode.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Lat Yao Chatuchak, Bangkok, 10900 Thailand.

ABSTRACT
The photovoltaic performance of a quantum dot (QD)-sensitized solar cell consisting of CdS/CdSe/ZnS QDs loaded onto the surface of the three-dimensional (3D) flower-like TiO2 structure grown on an array (1D) of TiO2 nanorods (FTiR) is studied. The flower-like structure on the rod-shaped titania was synthesized using a double-step hydrothermal process. The FTiR array exhibited a 3D/1D composite structure with a specific surface area of 81.87 m(2)/g. Using CuS as the counter electrode instead of Pt offers the best performance and leads to an increase in the conversion efficiency (η). The efficiency of the CdS/CdSe/ZnS QD-loaded FTiR assembling CuS counter electrode cell improved from η = 2.715% (Voc = 0.692 V, Jsc = 5.896 mA/cm(2), FF = 0.665) to η = 0.703% (Voc = 0.665 V, Jsc = 2.108 mA/cm(2), FF = 0.501) for the QD-loaded FTiR assembling Pt counter electrode cell. These studies reveal a synergistically beneficial effect on the solar-to-current conversion of these QD-sensitized solar cells when a CuS counter electrode is used instead of the usual Pt counter electrode.

No MeSH data available.