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Performances of some low-cost counter electrode materials in CdS and CdSe quantum dot-sensitized solar cells.

Jun HK, Careem MA, Arof AK - Nanoscale Res Lett (2014)

Bottom Line: While carbon-based materials produced the best solar cell performance in CdS QDSSCs, platinum and Cu2S were superior in CdSe QDSSCs.The poor performance of QDSSCs with some CE materials is largely due to the lower photocurrent density and open-circuit voltage.The electrochemical impedance spectroscopy performed on the cells showed that the poor-performing QDSSCs had higher charge-transfer resistances and CPE values at their CE/electrolyte interfaces.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre for Ionics University of Malaya (CIUM), Department of Physics, University of Malaya, Kuala Lumpur 50603, Malaysia. akarof@um.edu.my.

ABSTRACT
Different counter electrode (CE) materials based on carbon and Cu2S were prepared for the application in CdS and CdSe quantum dot-sensitized solar cells (QDSSCs). The CEs were prepared using low-cost and facile methods. Platinum was used as the reference CE material to compare the performances of the other materials. While carbon-based materials produced the best solar cell performance in CdS QDSSCs, platinum and Cu2S were superior in CdSe QDSSCs. Different CE materials have different performance in the two types of QDSSCs employed due to the different type of sensitizers and composition of polysulfide electrolytes used. The poor performance of QDSSCs with some CE materials is largely due to the lower photocurrent density and open-circuit voltage. The electrochemical impedance spectroscopy performed on the cells showed that the poor-performing QDSSCs had higher charge-transfer resistances and CPE values at their CE/electrolyte interfaces.

No MeSH data available.


J-V curves of CdS-based QDSSCs with various CEs.
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Figure 1: J-V curves of CdS-based QDSSCs with various CEs.

Mentions: For CdS QDSSCs, the J-V curves are shown in Figure 1 and the performance parameters are summarized in Table 1. Higher efficiencies of 1.06%, 1.20% and 1.16% are observed for solar cells assembled with commercial platinum catalyst, graphite layer and carbon soot, respectively, as CE materials. The solar cells with these CE materials produced current densities above 6.00 mA/cm2. These results indicate that carbon-based material (graphite and carbon soot) can be the alternative CE for CdS QDSSCs. On the other hand, Cu2S and RGO do not give better performances in our CdS QDSSC although better performances with these materials have been reported by other researchers with efficiencies above 3% [22,23]. The low performance of our QDSSCs with Cu2S and RGO as CEs is attributed to the respective overall low short-circuit current density, open-circuit voltage and fill factor. Nevertheless, the observed photocurrent density for the cell with Cu2S as CE is comparable with the published result of 3.06 mA/cm2[24]. In general, CdS QDSSCs exhibit low fill factors (less than 40%) with any of the tested CE materials.


Performances of some low-cost counter electrode materials in CdS and CdSe quantum dot-sensitized solar cells.

Jun HK, Careem MA, Arof AK - Nanoscale Res Lett (2014)

J-V curves of CdS-based QDSSCs with various CEs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3924232&req=5

Figure 1: J-V curves of CdS-based QDSSCs with various CEs.
Mentions: For CdS QDSSCs, the J-V curves are shown in Figure 1 and the performance parameters are summarized in Table 1. Higher efficiencies of 1.06%, 1.20% and 1.16% are observed for solar cells assembled with commercial platinum catalyst, graphite layer and carbon soot, respectively, as CE materials. The solar cells with these CE materials produced current densities above 6.00 mA/cm2. These results indicate that carbon-based material (graphite and carbon soot) can be the alternative CE for CdS QDSSCs. On the other hand, Cu2S and RGO do not give better performances in our CdS QDSSC although better performances with these materials have been reported by other researchers with efficiencies above 3% [22,23]. The low performance of our QDSSCs with Cu2S and RGO as CEs is attributed to the respective overall low short-circuit current density, open-circuit voltage and fill factor. Nevertheless, the observed photocurrent density for the cell with Cu2S as CE is comparable with the published result of 3.06 mA/cm2[24]. In general, CdS QDSSCs exhibit low fill factors (less than 40%) with any of the tested CE materials.

Bottom Line: While carbon-based materials produced the best solar cell performance in CdS QDSSCs, platinum and Cu2S were superior in CdSe QDSSCs.The poor performance of QDSSCs with some CE materials is largely due to the lower photocurrent density and open-circuit voltage.The electrochemical impedance spectroscopy performed on the cells showed that the poor-performing QDSSCs had higher charge-transfer resistances and CPE values at their CE/electrolyte interfaces.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre for Ionics University of Malaya (CIUM), Department of Physics, University of Malaya, Kuala Lumpur 50603, Malaysia. akarof@um.edu.my.

ABSTRACT
Different counter electrode (CE) materials based on carbon and Cu2S were prepared for the application in CdS and CdSe quantum dot-sensitized solar cells (QDSSCs). The CEs were prepared using low-cost and facile methods. Platinum was used as the reference CE material to compare the performances of the other materials. While carbon-based materials produced the best solar cell performance in CdS QDSSCs, platinum and Cu2S were superior in CdSe QDSSCs. Different CE materials have different performance in the two types of QDSSCs employed due to the different type of sensitizers and composition of polysulfide electrolytes used. The poor performance of QDSSCs with some CE materials is largely due to the lower photocurrent density and open-circuit voltage. The electrochemical impedance spectroscopy performed on the cells showed that the poor-performing QDSSCs had higher charge-transfer resistances and CPE values at their CE/electrolyte interfaces.

No MeSH data available.