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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.


Impedance spectra of the assembled QDSSCs. Impedance spectra of the assembled QDSSCs having the FTiR photoelectrode performance on the (a) CuS and (b) Pt counter electrode.
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Fig9: Impedance spectra of the assembled QDSSCs. Impedance spectra of the assembled QDSSCs having the FTiR photoelectrode performance on the (a) CuS and (b) Pt counter electrode.

Mentions: To see if the above activity is actually occurring, we have measured the electrical contact between the photoelectrode and the electrolytes in the QDSSCs using electro-chemical impedance spectroscopy (EIS). We find that the impedance spectra of the QD-loaded FTiR matched to either a CuS counter electrode or to Pt counter electrode under forward bias (−0.7 V) and dark conditions are quite different. The Nyquist plot (plot of the imaginary part of the impedance vs. the real part) of the EIS of QD/FTiR/CuS (Figure 9a) solar cell appears to be two semicircles (a small one at low frequency and a dominant one at higher frequencies). The values of the series resistance (the Rs at intercept of the frequency with the real axis) for the QD/FTiR/CuS (52.10 Ω) will be higher than those of those of junctions having Pt (29.94 Ω) as the counter electrode.Figure 9


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)

Impedance spectra of the assembled QDSSCs. Impedance spectra of the assembled QDSSCs having the FTiR photoelectrode performance on the (a) CuS and (b) Pt counter electrode.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig9: Impedance spectra of the assembled QDSSCs. Impedance spectra of the assembled QDSSCs having the FTiR photoelectrode performance on the (a) CuS and (b) Pt counter electrode.
Mentions: To see if the above activity is actually occurring, we have measured the electrical contact between the photoelectrode and the electrolytes in the QDSSCs using electro-chemical impedance spectroscopy (EIS). We find that the impedance spectra of the QD-loaded FTiR matched to either a CuS counter electrode or to Pt counter electrode under forward bias (−0.7 V) and dark conditions are quite different. The Nyquist plot (plot of the imaginary part of the impedance vs. the real part) of the EIS of QD/FTiR/CuS (Figure 9a) solar cell appears to be two semicircles (a small one at low frequency and a dominant one at higher frequencies). The values of the series resistance (the Rs at intercept of the frequency with the real axis) for the QD/FTiR/CuS (52.10 Ω) will be higher than those of those of junctions having Pt (29.94 Ω) as the counter electrode.Figure 9

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.