Temperature-dependent optical transitions of sol–gel derived Zn1−Mg O alloy films

Chia, C. H.; Tsai, Yi-Yan; Tzou, S.J.

doi:10.1016/j.jallcom.2014.11.024

Cited by 2 publications

(1 citation statement)

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“…A deepening of the potential fluctuations with increasing x results in the stronger localization of excitons and the increase of the Stokes shift. Similar differences can be observed in the case of FX and FA transitions [ 23 ]. However, such behavior is not observed in the case of c -oriented substrates and the possible reason can be related to a different stress, depending on the substrate orientation.…”

Section: Resultssupporting

confidence: 79%

Polar and Non-Polar Zn1−xMgxO:Sb Grown by MBE

et al. 2022

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The article presents a systematic study of Sb-doped Zn1-xMgxO layers, with various concentrations of Mg, that were successfully grown by plasma-assisted MBE on polar a- and c- oriented and non-polar r-oriented sapphire substrates. X-ray diffraction confirmed the polar c-orientation of alloys grown on c-and a-oriented sapphire and non-polar structures grown on r-oriented substrates. A uniform depth distribution of the Sb dopant at level of 2 × 1020 cm−3 was determined by SIMS measurements. Raman spectroscopy revealed the presence of Sb-related modes in all samples. It also showed that Mg alloying reduces the compressive strain associated with Sb doping in ZnO. XPS analysis indicates that the chemical state of Sb atoms in ZnMgO is 3+, suggesting a substitutional position of SbZn, probably associated with two VZn vacancies. Luminescence and transmission spectra were measured to determine the band gaps of the Zn1-xMgxO layers. The band gap energies extracted from the transmittance measurements differ slightly for the a, c, and r substrate orientations, and the differences increase with increasing Mg content, despite identical growth conditions. The differences between the energy gaps, determined from transmission and PL peaks, are closely correlated with the Stokes shift and increase with the Mg content in the analyzed series of ZnMgO layers.

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Section: Resultssupporting

confidence: 79%