Limits...
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

XRD spectra of pure ZnO and ZnO/dye hybrid films.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211477&req=5

Figure 4: XRD spectra of pure ZnO and ZnO/dye hybrid films.

Mentions: Figure 4 shows the effect of dye on the XRD pattern of ZnO films and hybrid films of ZnO/EoY and ZnO/TS-CuPu. In general, the pure ZnO and the ZnO/hybrid structures all showed a highly textured (002) hexagonal wurtzite structure. It is known that such films have a preferential orientation with the c-axis parallel to the substrate plane, consistent with the upright hexagonal columns, as shown in the bird's eye view of pure ZnO in the SEM image in Figure 2c. The relative peak intensities of the XRD spectra as shown in Table 1 confirm the preferential (002) orientation of all the three samples. Unlike in cases like those of Liu et al. [8] who reported the change in crystalline orientation of ZnO following dye adsorption, the crystallographic orientation of ZnO films remains unchanged by the dyes. However, there is a sharp contrast in the relative peak intensities between the pure ZnO and ZnO/dye hybrid thin films. Both the hybrid structures showed improved crystallinity compared with pure ZnO, as confirmed by the improved average crystalline domain size estimated from Scherrer's formula, corrected for stress-related and instrument-related broadenings for large grain (>100 nm) structures, using the full width at half maximum (FWHM) of each spectrum [9,10]. Although the decrease in the FWHM of the spectra for ZnO/Dye films was observed, and hence the improvement of grain sizes in comparison with that of pure ZnO, the improvement in crystallinity was more prominent in the ZnO/TS-CuPc hybrid thin films than in the ZnO/EoY. The average crystalline domain size for ZnO/TS-CuPc structure was approx. 4.5 nm, while that of ZnO/EoY was approx. 1.5 nm.


Nanostructured hybrid ZnO thin films for energy conversion.

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

XRD spectra of pure ZnO and ZnO/dye hybrid films.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: XRD spectra of pure ZnO and ZnO/dye hybrid films.
Mentions: Figure 4 shows the effect of dye on the XRD pattern of ZnO films and hybrid films of ZnO/EoY and ZnO/TS-CuPu. In general, the pure ZnO and the ZnO/hybrid structures all showed a highly textured (002) hexagonal wurtzite structure. It is known that such films have a preferential orientation with the c-axis parallel to the substrate plane, consistent with the upright hexagonal columns, as shown in the bird's eye view of pure ZnO in the SEM image in Figure 2c. The relative peak intensities of the XRD spectra as shown in Table 1 confirm the preferential (002) orientation of all the three samples. Unlike in cases like those of Liu et al. [8] who reported the change in crystalline orientation of ZnO following dye adsorption, the crystallographic orientation of ZnO films remains unchanged by the dyes. However, there is a sharp contrast in the relative peak intensities between the pure ZnO and ZnO/dye hybrid thin films. Both the hybrid structures showed improved crystallinity compared with pure ZnO, as confirmed by the improved average crystalline domain size estimated from Scherrer's formula, corrected for stress-related and instrument-related broadenings for large grain (>100 nm) structures, using the full width at half maximum (FWHM) of each spectrum [9,10]. Although the decrease in the FWHM of the spectra for ZnO/Dye films was observed, and hence the improvement of grain sizes in comparison with that of pure ZnO, the improvement in crystallinity was more prominent in the ZnO/TS-CuPc hybrid thin films than in the ZnO/EoY. The average crystalline domain size for ZnO/TS-CuPc structure was approx. 4.5 nm, while that of ZnO/EoY was approx. 1.5 nm.

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