Relationship between Aluminum and Lithium and Annealing for Reducing Lithium Contamination in Aluminum-Implanted Zinc Oxide

2020

J. Ceram. Soc. Japan

Self Cite

We studied on the oxygen diffusion in two kinds of Al implanted ZnO samples (100 keV, 4 © 10 14 ions/cm 2). Parts of samples were annealed to diffuse simultaneously Al and Li impurity, and then same concentration distribution of Al and Li were observed. Through the oxygen diffusion experiments, the feature of bulk diffusion in the preannealed samples was separated at 950°C so that the large activation energy for bulk diffusion was observed below the pre-annealing temperature. Oxygen diffusion feature was explained as result from interaction between Al and Li for the pre-annealing.

Section: Methodsmentioning

confidence: 97%

“…13) Our pioneer research indicated that Al incorporation in ZnO leads to increase the concentration of Li contaminant for annealing. 14) Moreover, the defect chemistry in Al-doped ZnO was studied through the diffusion of O and Li. 15) The results of this paper are described shortly in the below.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of oxygen diffusion induced by Al and Li interaction in Al-implanted zinc oxide ceramics

2020

J. Ceram. Soc. Japan

Self Cite

“…Recently, we confirmed Li contamination in Al-implanted ZnO ceramics during the annealing. 17) From the study of Ref. 17), the oxygen interstitials in ZnO lattice are possible to accelerate the Li contamination.…”

Section: Resultsmentioning

confidence: 99%

“…17) From the study of Ref. 17), the oxygen interstitials in ZnO lattice are possible to accelerate the Li contamination. The defect concentration responsible for oxygen bulk diffusion decreases, and then the bulk diffusion coefficient becomes small.…”

Section: Resultsmentioning

confidence: 99%

Oxygen tracer diffusion in magnesium-doped ZnO ceramics

Matsumoto

Ohgaki

et al. 2010

J. Ceram. Soc. Japan

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ZnO samples added with MgO of 1.411.7 mol % were used for studying oxygen diffusion by the vaporsolid exchange method. The analyses of oxygen diffusion profiles and impurities were performed by secondary-ion mass spectrometry (SIMS). The results indicate that the increase of MgO concentration enhances oxygen diffusion. The difference between the bulk-diffusion coefficients of oxygen for ZnO samples added with MgO of 1.4 and 11.7 mol % was about two orders of magnitude. It was found that the grain boundary diffusion coefficients of oxygen in ZnO with 11.7 mol % of MgO were larger than those in other samples, by a factor of about 10. Above results indicate that MgO addition into ZnO increases the concentration of effective defects for that promote oxygen diffusion. As the effective defects, the possibilities of vacancy and interstitial of oxygen are discussed.

“…13) From a series of studies using Al-implanted ZnO, we found evidence of Li diffusion and contamination from the sample surface during the annealing. 14) Diffusing Li reduces the electrical performance of donor-doped ZnO, because Li acts as the acceptor in ZnO. From the previous study, we have found that Al-doped ZnO can avoid the Li contamination in the sintering under low oxygen partial pressure.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Diffusion of Oxygen Tracer and Lithium Impurity in Aluminum Doped Zinc Oxide

Watanabe

Adachi

et al. 2011

Jpn. J. Appl. Phys.

Self Cite

Aluminum-doped zinc oxide ceramics were used to study oxygen self-diffusion by the vapor–solid exchange method. The diffusion profile and the quantitative analysis of impurities (H, Li, and Al) were performed by secondary ion mass spectrometry. The concentrations of Al and H in ZnO were evaluated to be 3.2×1019 and below 1.5×1017/cm3, respectively. The simultaneous diffusion of oxygen tracer and Li impurity were detected in the analysis, and the diffusion profiles were analyzed to evaluate the diffusion coefficients. Enhanced oxygen diffusivity and increased Li impurity concentration was obtained in Al-doped ZnO. We discuss the defect equations for enhancing oxygen diffusivity and increasing Li concentration in Al-doped ZnO.