info:eu-repo/semantics/article
Effect of Doping and Morphology on UV Emission in Low-Dimensional ZnO:Na Structures
Fecha
2018-08Registro en:
Straube, Benjamin; Bridoux, German; Zapata, María Cecilia; Ferreyra, Jorge Mario; Villafuerte, Manuel Jose; et al.; Effect of Doping and Morphology on UV Emission in Low-Dimensional ZnO:Na Structures; Wiley VCH Verlag; Physica Status Solidi B-basic Research; 255; 8; 8-2018; 1800056-1800056
0370-1972
CONICET Digital
CONICET
Autor
Straube, Benjamin
Bridoux, German
Zapata, María Cecilia
Ferreyra, Jorge Mario
Villafuerte, Manuel Jose
Simonelli, Gabriela
Ezquinazi, Pablo
RodrÍguez Torres, Claudia Elena
Pérez, Silvia Inés
Resumen
Band-edge photoluminescence of zinc oxide materials reveals a phonon-assisted ultraviolet emission enhanced by Na doping. We report the synthesis of ZnO and Na-doped ZnO, the changes in structure and optical properties as a function of doping concentration and synthesis temperature. The obtained samples are nanoneedles, microparticles, and microwires. The structural effect of Na doping is studied by X-ray diffraction and Raman spectroscopy. Room temperature photoluminescence reveals a contribution of band bending at the surface of the nanostructures, decreasing with Na concentration. Franz–Keldysh effect predicts strong electric field localized in the depletion region and appears to be the cause of red-shift in UV band emission of nanoneedles in comparison to microwires. Our results indicate that Na doping introduces an acceptor level between 150 and 200 meV above the valence band.