Structural, morphological, optical, and electrical studies of Tb-doped ZnO micropods elaborated by chemical bath deposition on a p-Si substrate

Abstract

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Microstructural, optical, and electrical properties of Eu, Tb co-doped ZnO micropods elaborated by chemical bath deposition on a p-Si substrate

“…These results confirm the low solubility of rare-earth elements in the ZnO host owing to the significant difference between the ionic radii of the dopant( 93 pm) and Zn (74 pm) [15,24].…”

“…The layer was a thin film with a continuous and smooth coverage of small spherical grains with an average diameter of 100 nm. The morphology of the micropods elaborated on the seed layer is similar to that observed with a single dopant [15,24] deposit directly on the Si substrate. The presence of the grain interfaces did not affect the distribution, size, or orientation of these micropods.…”

“…The peaks centered at binding energies of 1240.6 eV and 1273. 6 eV was assigned to Tb 3+ oxidation state, while peaks centered at 1243.3 eV and 1276.6 eV corresponds to Tb 4+ oxidation state [24,31,32]. A mixed valence states of Eu and Tb ions in the lattice of ZnO micropods were confirmed by XPS.…”

“…The individual components of the O 1s XPS peak were extracted after deconvolution using multiple Gaussian peaks (Figure 5). The Gaussian fitting of the O1s XPS spectrum and the attribution of each components is similar as that done for Eu and Tb doped ZnO [15,24]. Oxygen XPS peaks are listed in Table 3.…”

“…However, their incorporation is accompanied by structural modification caused by the appearance of mechanical stress and defects which will be affect the RE ions luminescence and the efficiency of the excitation energy transfer between the host and RE ions and/or between the two dopant ions [23]. Recently, we have study the structural, optical and electrical properties of Eu- [15] and Tb-doped [24] ZnO micropods prepared by chemical bath deposition on p-Si substrate. In this work, a similar investigation was conducted to explore the effect of heat treatment and the relative variation in dopant concentration prepared using the same procedure.…”