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Improved conversion efficiency of Ag2S quantum dot-sensitized solar cells based on TiO2 nanotubes with a ZnO recombination barrier layer.

Chen C, Xie Y, Ali G, Yoo SH, Cho SO - Nanoscale Res Lett (2011)

Bottom Line: We improve the conversion efficiency of Ag2S quantum dot (QD)-sensitized TiO2 nanotube-array electrodes by chemically depositing ZnO recombination barrier layer on plain TiO2 nanotube-array electrodes.It is found that for the prepared electrodes, with increasing the cycles of Ag2S deposition, the photocurrent density and the conversion efficiency increase.In addition, as compared to the Ag2S QD-sensitized TiO2 nanotube-array electrode without the ZnO layers, the conversion efficiency of the electrode with the ZnO layers increases significantly due to the formation of efficient recombination layer between the TiO2 nanotube array and electrolyte.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong, Yuseong, Daejeon 305-701, Republic of Korea. socho@kaist.ac.kr.

ABSTRACT
We improve the conversion efficiency of Ag2S quantum dot (QD)-sensitized TiO2 nanotube-array electrodes by chemically depositing ZnO recombination barrier layer on plain TiO2 nanotube-array electrodes. The optical properties, structural properties, compositional analysis, and photoelectrochemistry properties of prepared electrodes have been investigated. It is found that for the prepared electrodes, with increasing the cycles of Ag2S deposition, the photocurrent density and the conversion efficiency increase. In addition, as compared to the Ag2S QD-sensitized TiO2 nanotube-array electrode without the ZnO layers, the conversion efficiency of the electrode with the ZnO layers increases significantly due to the formation of efficient recombination layer between the TiO2 nanotube array and electrolyte.

No MeSH data available.


The low- and high-magnification TEM images, EDX spectrum, and XRD pattern. (a) TEM image of the Ag2S(4)/ZnO/TNT electrode showing the formation of ZnO on the TNTs and the Ag2S nanoparticles inside the TNTs, (b) an HR-TEM image of a deposited Ag2S quantum dot, (c) the EDX spectrum, and (d) XRD pattern of the Ag2S(4)/ZnO/TNTs.
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Figure 3: The low- and high-magnification TEM images, EDX spectrum, and XRD pattern. (a) TEM image of the Ag2S(4)/ZnO/TNT electrode showing the formation of ZnO on the TNTs and the Ag2S nanoparticles inside the TNTs, (b) an HR-TEM image of a deposited Ag2S quantum dot, (c) the EDX spectrum, and (d) XRD pattern of the Ag2S(4)/ZnO/TNTs.

Mentions: The detailed microscopic structure of the Ag2S(4)/ZnO/TNTs was further investigated by a high-resolution transmission electron microscope (HR-TEM). Figure 3a shows the low-magnification TEM image of the Ag2S(4)/ZnO/TNTs. It can be clearly seen that many Ag2S nanoparticles with diameters of approximately 10 nm were deposited into the TNTs. This is supported by our earlier observation in the SEM measurement (Figure 2c). Figure 3b shows the high-magnification image of the Ag2S(4)/ZnO/TNTs. It is observed that the crystalline Ag2S nanoparticles were grown on crystalline TNTs. In addition, the HR-TEM image in Figure 3b reveals clear lattice fringes, the observed lattice fringe spacing of 0.268 nm is consistent with the unique separation (0.266 nm) between (120) planes in bulk acanthite Ag2S crystallites.


Improved conversion efficiency of Ag2S quantum dot-sensitized solar cells based on TiO2 nanotubes with a ZnO recombination barrier layer.

Chen C, Xie Y, Ali G, Yoo SH, Cho SO - Nanoscale Res Lett (2011)

The low- and high-magnification TEM images, EDX spectrum, and XRD pattern. (a) TEM image of the Ag2S(4)/ZnO/TNT electrode showing the formation of ZnO on the TNTs and the Ag2S nanoparticles inside the TNTs, (b) an HR-TEM image of a deposited Ag2S quantum dot, (c) the EDX spectrum, and (d) XRD pattern of the Ag2S(4)/ZnO/TNTs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211883&req=5

Figure 3: The low- and high-magnification TEM images, EDX spectrum, and XRD pattern. (a) TEM image of the Ag2S(4)/ZnO/TNT electrode showing the formation of ZnO on the TNTs and the Ag2S nanoparticles inside the TNTs, (b) an HR-TEM image of a deposited Ag2S quantum dot, (c) the EDX spectrum, and (d) XRD pattern of the Ag2S(4)/ZnO/TNTs.
Mentions: The detailed microscopic structure of the Ag2S(4)/ZnO/TNTs was further investigated by a high-resolution transmission electron microscope (HR-TEM). Figure 3a shows the low-magnification TEM image of the Ag2S(4)/ZnO/TNTs. It can be clearly seen that many Ag2S nanoparticles with diameters of approximately 10 nm were deposited into the TNTs. This is supported by our earlier observation in the SEM measurement (Figure 2c). Figure 3b shows the high-magnification image of the Ag2S(4)/ZnO/TNTs. It is observed that the crystalline Ag2S nanoparticles were grown on crystalline TNTs. In addition, the HR-TEM image in Figure 3b reveals clear lattice fringes, the observed lattice fringe spacing of 0.268 nm is consistent with the unique separation (0.266 nm) between (120) planes in bulk acanthite Ag2S crystallites.

Bottom Line: We improve the conversion efficiency of Ag2S quantum dot (QD)-sensitized TiO2 nanotube-array electrodes by chemically depositing ZnO recombination barrier layer on plain TiO2 nanotube-array electrodes.It is found that for the prepared electrodes, with increasing the cycles of Ag2S deposition, the photocurrent density and the conversion efficiency increase.In addition, as compared to the Ag2S QD-sensitized TiO2 nanotube-array electrode without the ZnO layers, the conversion efficiency of the electrode with the ZnO layers increases significantly due to the formation of efficient recombination layer between the TiO2 nanotube array and electrolyte.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong, Yuseong, Daejeon 305-701, Republic of Korea. socho@kaist.ac.kr.

ABSTRACT
We improve the conversion efficiency of Ag2S quantum dot (QD)-sensitized TiO2 nanotube-array electrodes by chemically depositing ZnO recombination barrier layer on plain TiO2 nanotube-array electrodes. The optical properties, structural properties, compositional analysis, and photoelectrochemistry properties of prepared electrodes have been investigated. It is found that for the prepared electrodes, with increasing the cycles of Ag2S deposition, the photocurrent density and the conversion efficiency increase. In addition, as compared to the Ag2S QD-sensitized TiO2 nanotube-array electrode without the ZnO layers, the conversion efficiency of the electrode with the ZnO layers increases significantly due to the formation of efficient recombination layer between the TiO2 nanotube array and electrolyte.

No MeSH data available.