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Nanostructured hybrid ZnO thin films for energy conversion.

Moya M, Samantilleke AP, Mollar M, Marí B - Nanoscale Res Lett (2011)

Bottom Line: We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY).High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films.Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department de Física Aplicada-IDF, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, Spain. anura@fisica.uminho.pt.

ABSTRACT
We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY). Both the morphology and porosity of hybrid ZnO films are highly dependent on the type of dyes used in the synthesis. High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films. Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

No MeSH data available.


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Absorption spectra of the as-deposited hybrid thin films.
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Figure 3: Absorption spectra of the as-deposited hybrid thin films.

Mentions: The absorbance spectra of the ZnO/dye hybrid thin films, as shown in Figure 3, include peaks located in the visible part of the solar spectrum (400-575 nm) with an absorption maximum at 524 nm and a secondary peak at 497 nm, as observed previously [6]. In the case of ZnO/TS-CuPc, both spectra of two different concentrations (5 × 10-3 M and 1 × 10-4 M) show a broad absorption band from 570 to 730 nm with a maximum absorption peak at 690 nm (porphyrin Q-bands). This broadening of the porphyrin Q-band with increased concentration indicates the formation of strongly coupled dye aggregates [7]. From the solution containing TS-CuPc sensitizers, the dye was found to be adsorbed to the growing ZnO. The adsorbed dye molecules are only loosely bonded, which explains the formation of a high density of large diameter pores during NaOH treatment, as observed in the morphology analysis. The spectral characteristics in the uptake of TS-CuPc were so few that even the weak porphyrin Q-bands dominated that part of the spectrum. Increased dye concentration also clearly increased absorption.


Nanostructured hybrid ZnO thin films for energy conversion.

Moya M, Samantilleke AP, Mollar M, Marí B - Nanoscale Res Lett (2011)

Absorption spectra of the as-deposited hybrid thin films.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211477&req=5

Figure 3: Absorption spectra of the as-deposited hybrid thin films.
Mentions: The absorbance spectra of the ZnO/dye hybrid thin films, as shown in Figure 3, include peaks located in the visible part of the solar spectrum (400-575 nm) with an absorption maximum at 524 nm and a secondary peak at 497 nm, as observed previously [6]. In the case of ZnO/TS-CuPc, both spectra of two different concentrations (5 × 10-3 M and 1 × 10-4 M) show a broad absorption band from 570 to 730 nm with a maximum absorption peak at 690 nm (porphyrin Q-bands). This broadening of the porphyrin Q-band with increased concentration indicates the formation of strongly coupled dye aggregates [7]. From the solution containing TS-CuPc sensitizers, the dye was found to be adsorbed to the growing ZnO. The adsorbed dye molecules are only loosely bonded, which explains the formation of a high density of large diameter pores during NaOH treatment, as observed in the morphology analysis. The spectral characteristics in the uptake of TS-CuPc were so few that even the weak porphyrin Q-bands dominated that part of the spectrum. Increased dye concentration also clearly increased absorption.

Bottom Line: We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY).High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films.Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department de Física Aplicada-IDF, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, Spain. anura@fisica.uminho.pt.

ABSTRACT
We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY). Both the morphology and porosity of hybrid ZnO films are highly dependent on the type of dyes used in the synthesis. High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films. Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

No MeSH data available.


Related in: MedlinePlus