Title:
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Visible photoluminescence components of solution-grown ZnO nanowires: Influence of the surface depletion layer
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Author:
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Fan, J.; Güell, F.; Fàbrega Alsina, Carles; Fairbrother, A.; Andreu, T.; López Martínez, Antonio Miguel; Morante Lleonart, Joan Ramon; Cabot, A.
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. INSIDE - Innovació en Sistemes per al Disseny i la Formació a l'Enginyeria |
Abstract:
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Arrays of electrodeposited ZnO nanowires (NWs) were used to illustrate the dependence of the ZnO visible
photoluminescence (PL) emission on the extension of the surface depletion layer and obtain further insight into the localization
of the related states. With this goal in mind, three sets of measurements were carried out: (i) analysis of the PL spectra of ZnO:Cl
NWs as a function of their carrier concentration; (ii) analysis of the PL spectra of ZnO:Cl/ZnO core−shell NWs as a function of
the thickness of their intrinsic ZnO shell; (iii) in situ analysis of the PL dependence on the polarization of ZnO:Cl
photoelectrodes. The obtained experimental results evidenced that the yellow and orange emissions from electrodeposited ZnO
NWs are correlated with the extension of the NWs surface depletion region. This result points out the surface localization of the
states at the origin of these transitions. On the other hand, the green emission that dominates the visible part of the PL spectra in
annealed ZnO NWs showed no dependence on the surface band bending, thus pointing toward its origin in the bulk. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica -Nanowires -Zinc oxide--Electric properties -Nanotecnologia -Òxid de zinc -Fotoluminescència |
Rights:
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Document type:
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Article - Published version Article |
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