Tunable zinc interstitial related defects in ZnMgO and ZnCdO films

Abstract

High-temperature stability of postgrowth-annealed Al-doped MgxZn1-xO films without the phase separation effect J. Vac. Sci. Technol. B 30, 061201 (2012); 10.1116/1.4754813 Effect of substrate temperature on the properties of transparent conductive ZnO:Al thin films prepared by RF sputtering J. Vac. Sci. Technol. A 29, 051506 (2011); 10.1116/1.3610175 Phonon dynamics of Zn(Mg,Cd)O alloy nanostructures and their phase segregation Effect of high-energy electron beam irradiation on the properties of ZnO thin films prepared by magnetron sputteringWe report tunable band gap of ZnO thin films grown on quartz substrates by radio frequency magnetron sputtering. The zinc interstitial (Zn i ) defects in ZnO films were investigated by X-ray diffraction, Raman scattering, Auger spectra, first-principle calculations, and Hall measurement. Undoped ZnO film exhibits an anomalous Raman mode at 275 cm À1 . We first report that 275 cm À1 mode also can be observed in ZnO films alloyed with Mg and Cd, whose Raman intensities, interestingly, decrease and increase with increasing Mg and Cd alloying content, respectively. Combined with the previous investigations, it is deduced that 275 cm À1 mode is attributed to Zn i related defects, which is demonstrated by our further experiment and theoretical calculation. Consequently, the concentration of Zn i related defects in ZnO can be tuned by alloying Mg and Cd impurity, which gives rise to different conductivity in ZnO films. These investigations help to further understand the controversial origin of the additional Raman mode at 275 cm À1 and also the natural n-type conductivity in ZnO. V C 2015 AIP Publishing LLC. [http://dx.

PdZn catalysts for CO2 hydrogenation to methanol using chemical vapour impregnation (CVI)

“…Analysis on ZnO powder reveals peak at 988 eV and a shoulder at 991 eV. The shoulder peak at 991 eV was suggested previously by Li et al as interstitial Zn present as defect sites in the ZnO lattice 33 . These changes between metallic and oxidised states are thus much clearer in the Auger spectra than in the core level spectra and reflect changes in the M (valence) levels of Zn.…”

“…S5. For Zn metal it was reported that there are peak positions of 992 (major) and 996 (minor) 32 , while for the oxide they are 988 and 991 respectively 33 . Zn metal shows major peaks at kinetic energy of 996 eV and 992.5 eV and minor peaks at 989.3 eV and 986 eV ( fig.…”

CO2 Hydrogenation to CH3OH over PdZn Catalysts, with Reduced CH4 Production

“…were observed between synthesised catalysts (Figure S5a). The Zn(LM 2 ) Auger peak for zinc oxide is at 988 eV with a minor satellite contribution at 991 eV, [50] whilst for metallic zinc these peaks are much more shifted than the core levels, to 992 eV and 996 eV respectively [51] . Therefore, the Zn(LM 2 ) Auger electron spectra were also analysed, since it has higher discrimination for chemical changes (Figure S5b).…”

A Patternable and In Situ Formed Polymeric Zinc Blanket for a Reversible Zinc Anode in a Skin‐Mountable Microbattery

“…Furthermore, the coordinated Zn can be identified in the Zn LMM Auger spectrum measured by X-ray photoelectron spectroscopy (XPS). [32,33] The coordinated Zn peak centered at 496.7 eV, in addition to the lattice Zn peak centered at 499.8 eV, is evident in Figure 3d. [34] Likewise, a shoulder peak centered at 532.6 eV in the spectrum of the O1s core level of the piZn confirms the interaction between Zn ions and the carbonyl oxygen atoms ( Figure S10, Supporting Information).…”