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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.


Related in: MedlinePlus

Photocurrent measured at one-step electrodeposited pure ZnO (black) and hybrid thin films under white light illumination.
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Figure 5: Photocurrent measured at one-step electrodeposited pure ZnO (black) and hybrid thin films under white light illumination.

Mentions: Despite inferior crystallinity (to ZnO/TS-CuPc), ZnO/EoY provides an efficient route for transport of electrons with a relatively high photocurrent response (Figure 5). However, the maximum efficiency obtained for ZnO/EoY hybrid structures when applied in DSSCs is only 2.3% [11] despite the closely matched energy levels between EoY and ZnO. Theoretical analyses confirm that this low efficiency is because only a small fraction of the electrons generated in the highest occupied molecular orbital of the dye has sufficient energy to transfer to the lowest unoccupied molecular orbital [12]. The photocurrent of the ZnO/TS-CuPc thin films was insufficient, as shown in Figure 5, due to the mismatching of energy levels between TS-CuPc and ZnO. This dye adsorption occurs mostly between stacked ZnO layers of the mesoporous structure, masking the dye from absorbing any light and, therefore, generating no photocurrent.


Nanostructured hybrid ZnO thin films for energy conversion.

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

Photocurrent measured at one-step electrodeposited pure ZnO (black) and hybrid thin films under white light illumination.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Photocurrent measured at one-step electrodeposited pure ZnO (black) and hybrid thin films under white light illumination.
Mentions: Despite inferior crystallinity (to ZnO/TS-CuPc), ZnO/EoY provides an efficient route for transport of electrons with a relatively high photocurrent response (Figure 5). However, the maximum efficiency obtained for ZnO/EoY hybrid structures when applied in DSSCs is only 2.3% [11] despite the closely matched energy levels between EoY and ZnO. Theoretical analyses confirm that this low efficiency is because only a small fraction of the electrons generated in the highest occupied molecular orbital of the dye has sufficient energy to transfer to the lowest unoccupied molecular orbital [12]. The photocurrent of the ZnO/TS-CuPc thin films was insufficient, as shown in Figure 5, due to the mismatching of energy levels between TS-CuPc and ZnO. This dye adsorption occurs mostly between stacked ZnO layers of the mesoporous structure, masking the dye from absorbing any light and, therefore, generating no photocurrent.

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