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ZnO Hierarchical Nanostructure Photoanode in a CdS Quantum Dot-Sensitized Solar Cell.

Liu H, Zhang G, Sun W, Shen Z, Shi M - PLoS ONE (2015)

Bottom Line: Using the hierarchical photoanode dramatically increased the short circuit current density and also slightly raised the open circuit voltage and the fill factor.As a result, the conversion efficiency of the QDSSC based on the hierarchical photoanode was more than twice that of the QDSSC based on the simple ZnO nanocone photoanode.This improvement is attributable to both the enlarged specific area of the photoanode and the reduction in the recombination of the photoexcited electrons.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing, China.

ABSTRACT
A hierarchical array of ZnO nanocones covered with ZnO nanospikes was hydrothermally fabricated and employed as the photoanode in a CdS quantum dot-sensitized solar cell (QDSSC). This QDSSC outperformed the QDSSC based on a simple ZnO nanocone photoanode in all the four principal photovoltaic parameters. Using the hierarchical photoanode dramatically increased the short circuit current density and also slightly raised the open circuit voltage and the fill factor. As a result, the conversion efficiency of the QDSSC based on the hierarchical photoanode was more than twice that of the QDSSC based on the simple ZnO nanocone photoanode. This improvement is attributable to both the enlarged specific area of the photoanode and the reduction in the recombination of the photoexcited electrons.

No MeSH data available.


ZNC/ZNS nanostructures loaded with CdS QDs.(A) a TEM image, (B) an HRTEM image, and (C) EDS.
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pone.0138298.g003: ZNC/ZNS nanostructures loaded with CdS QDs.(A) a TEM image, (B) an HRTEM image, and (C) EDS.

Mentions: Fig 3A and 3B show the TEM and HRTEM images of the ZNC/ZNS nanostructures with some QDs, ~6 nm in size, adsorbed on them. Fig 3B also shows lattice fringes of 0.316 and 0.336 nm, which can be indexed as the (101) and (002) planes of CdS (JCPDS 10–0454). The selected area EDS of the sample, shown in Fig 3C, further confirms the elementary composition of the CdS-coated nanostructures, which, as expected, are Zn, O, Cd and S elements. (The Cu peak arose from the supporting Cu mesh in the TEM observation.)


ZnO Hierarchical Nanostructure Photoanode in a CdS Quantum Dot-Sensitized Solar Cell.

Liu H, Zhang G, Sun W, Shen Z, Shi M - PLoS ONE (2015)

ZNC/ZNS nanostructures loaded with CdS QDs.(A) a TEM image, (B) an HRTEM image, and (C) EDS.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4574909&req=5

pone.0138298.g003: ZNC/ZNS nanostructures loaded with CdS QDs.(A) a TEM image, (B) an HRTEM image, and (C) EDS.
Mentions: Fig 3A and 3B show the TEM and HRTEM images of the ZNC/ZNS nanostructures with some QDs, ~6 nm in size, adsorbed on them. Fig 3B also shows lattice fringes of 0.316 and 0.336 nm, which can be indexed as the (101) and (002) planes of CdS (JCPDS 10–0454). The selected area EDS of the sample, shown in Fig 3C, further confirms the elementary composition of the CdS-coated nanostructures, which, as expected, are Zn, O, Cd and S elements. (The Cu peak arose from the supporting Cu mesh in the TEM observation.)

Bottom Line: Using the hierarchical photoanode dramatically increased the short circuit current density and also slightly raised the open circuit voltage and the fill factor.As a result, the conversion efficiency of the QDSSC based on the hierarchical photoanode was more than twice that of the QDSSC based on the simple ZnO nanocone photoanode.This improvement is attributable to both the enlarged specific area of the photoanode and the reduction in the recombination of the photoexcited electrons.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing, China.

ABSTRACT
A hierarchical array of ZnO nanocones covered with ZnO nanospikes was hydrothermally fabricated and employed as the photoanode in a CdS quantum dot-sensitized solar cell (QDSSC). This QDSSC outperformed the QDSSC based on a simple ZnO nanocone photoanode in all the four principal photovoltaic parameters. Using the hierarchical photoanode dramatically increased the short circuit current density and also slightly raised the open circuit voltage and the fill factor. As a result, the conversion efficiency of the QDSSC based on the hierarchical photoanode was more than twice that of the QDSSC based on the simple ZnO nanocone photoanode. This improvement is attributable to both the enlarged specific area of the photoanode and the reduction in the recombination of the photoexcited electrons.

No MeSH data available.