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Improving the performance of dye-sensitized solar cells with TiO2/graphene/TiO2 sandwich structure.

Chen LC, Hsu CH, Chan PS, Zhang X, Huang CJ - Nanoscale Res Lett (2014)

Bottom Line: This study investigates the extent to which the TiO2/graphene/TiO2 sandwich structure improves the performance of dye-sensitized solar cells (DSSCs) over that of DSSCs with the traditional structure.Studies have demonstrated that the TiO2/graphene/TiO2 sandwich structure effectively enhances the open circuit voltage (V oc), short-circuit current density (J sc), and photoelectrical conversion efficiency (η) of DSSCs.The enhanced performance of DSSCs with the sandwich structure can be attributed to an increase in electron transport efficiency and in the absorption of light in the visible range.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electro-optical Engineering, National Taipei University of Technology, 1, 3 Sec., Chung-Hsiao E. Rd., Taipei 106, Taiwan.

ABSTRACT
This study investigates the extent to which the TiO2/graphene/TiO2 sandwich structure improves the performance of dye-sensitized solar cells (DSSCs) over that of DSSCs with the traditional structure. Studies have demonstrated that the TiO2/graphene/TiO2 sandwich structure effectively enhances the open circuit voltage (V oc), short-circuit current density (J sc), and photoelectrical conversion efficiency (η) of DSSCs. The enhanced performance of DSSCs with the sandwich structure can be attributed to an increase in electron transport efficiency and in the absorption of light in the visible range. The DSSC with the sandwich structure in this study exhibited a V oc of 0.6 V, a high J sc of 11.22 mA cm(-2), a fill factor (FF) of 0.58, and a calculated η of 3.93%, which is 60% higher than that of a DSSC with the traditional structure.

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SEM images of TiO2 nanoparticles. (a) Nanoparticles in structures of DSSCs. (b) Sample 1. (c) Sample 2. (d) Sample 3.
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Figure 2: SEM images of TiO2 nanoparticles. (a) Nanoparticles in structures of DSSCs. (b) Sample 1. (c) Sample 2. (d) Sample 3.

Mentions: Figure 2a shows the surface morphology of the TiO2 photoelectrode. The TiO2 nanoparticles have a mean diameter of 50 nm. Sufficient interspaces in the photoelectrode layer facilitated the loading of dye into the film. Figure 2b,c,d shows the cross-sectional scanning electron microscopy (SEM) images of the three prepared DSSCs - samples 1, 2, and 3, respectively. The thicknesses of the photoeletrodes in samples 1 and 2 were 4 and 9.5 μm, respectively, as presented in Figure 2b,c. However, the thickness of the first TiO2 layer in sample 3 was 4 μm and that of the second layer was 6.5 μm. The thickness of the two photoelectrode layers differed although the spin-coating parameters were the same because different substrates were used during spin-coating. The graphene layer served as the substrate when the second photoelectrode layer had been deposited. The thickness of the photoelectrode of sample 3 is almost the same as the one of sample 2.


Improving the performance of dye-sensitized solar cells with TiO2/graphene/TiO2 sandwich structure.

Chen LC, Hsu CH, Chan PS, Zhang X, Huang CJ - Nanoscale Res Lett (2014)

SEM images of TiO2 nanoparticles. (a) Nanoparticles in structures of DSSCs. (b) Sample 1. (c) Sample 2. (d) Sample 3.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4127667&req=5

Figure 2: SEM images of TiO2 nanoparticles. (a) Nanoparticles in structures of DSSCs. (b) Sample 1. (c) Sample 2. (d) Sample 3.
Mentions: Figure 2a shows the surface morphology of the TiO2 photoelectrode. The TiO2 nanoparticles have a mean diameter of 50 nm. Sufficient interspaces in the photoelectrode layer facilitated the loading of dye into the film. Figure 2b,c,d shows the cross-sectional scanning electron microscopy (SEM) images of the three prepared DSSCs - samples 1, 2, and 3, respectively. The thicknesses of the photoeletrodes in samples 1 and 2 were 4 and 9.5 μm, respectively, as presented in Figure 2b,c. However, the thickness of the first TiO2 layer in sample 3 was 4 μm and that of the second layer was 6.5 μm. The thickness of the two photoelectrode layers differed although the spin-coating parameters were the same because different substrates were used during spin-coating. The graphene layer served as the substrate when the second photoelectrode layer had been deposited. The thickness of the photoelectrode of sample 3 is almost the same as the one of sample 2.

Bottom Line: This study investigates the extent to which the TiO2/graphene/TiO2 sandwich structure improves the performance of dye-sensitized solar cells (DSSCs) over that of DSSCs with the traditional structure.Studies have demonstrated that the TiO2/graphene/TiO2 sandwich structure effectively enhances the open circuit voltage (V oc), short-circuit current density (J sc), and photoelectrical conversion efficiency (η) of DSSCs.The enhanced performance of DSSCs with the sandwich structure can be attributed to an increase in electron transport efficiency and in the absorption of light in the visible range.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electro-optical Engineering, National Taipei University of Technology, 1, 3 Sec., Chung-Hsiao E. Rd., Taipei 106, Taiwan.

ABSTRACT
This study investigates the extent to which the TiO2/graphene/TiO2 sandwich structure improves the performance of dye-sensitized solar cells (DSSCs) over that of DSSCs with the traditional structure. Studies have demonstrated that the TiO2/graphene/TiO2 sandwich structure effectively enhances the open circuit voltage (V oc), short-circuit current density (J sc), and photoelectrical conversion efficiency (η) of DSSCs. The enhanced performance of DSSCs with the sandwich structure can be attributed to an increase in electron transport efficiency and in the absorption of light in the visible range. The DSSC with the sandwich structure in this study exhibited a V oc of 0.6 V, a high J sc of 11.22 mA cm(-2), a fill factor (FF) of 0.58, and a calculated η of 3.93%, which is 60% higher than that of a DSSC with the traditional structure.

No MeSH data available.


Related in: MedlinePlus