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Site-Selective Oxygen Vacancy Formation Derived from the Characteristic Crystal Structures of in Sn-Nb complex Oxides by Samizo, Akane; Minohara, Makoto; Kikuchi, Naoto; Bando, Kyoko K.; Aiura, Yoshihiro; Mibu, Ko; Nishio, Keishi is a scholarly article available to read on EtoBox.

What is Site-Selective Oxygen Vacancy Formation Derived from the Characteristic Crystal Structures of in Sn-Nb complex Oxides about?

Divalent tin oxides have attracted considerable attention as novel p-type oxide semiconductors, which are essential for realizing future oxide electronic devices. Recently, p-type Sn2Nb2O7 and SnNb2O6 were developed; however, enhanced hole mobility by reducing defect concentrations is required for practical use. In this work, we investigate the correlation between the formation of oxygen vacancy which may reduce the hole-generation efficiency and hole mobility, and the crystal structure in Sn-Nb complex oxides. Extended X-ray absorption fine structure spectroscopy and Rietveld analysis of x-ray diffraction revealed the preferential formation of oxygen vacancy at the O site bonded to the Sn ions in both the tin niobates. Moreover, a large amount of oxygen vacancy around the Sn ions were found in the p-type Sn2Nb2O7, thereby indicating the effect of oxygen vacancy to the low hole-generation efficiency. The dependence of the formation of oxygen vacancy on the crystal structure can be elucidated from the Sn-O bond strength that is evaluated based on the bond valence sum and Debye temperature. The differences in the bond strengths of the two Sn-Nb complex oxides are correlated through t

Author

Samizo, Akane; Minohara, Makoto; Kikuchi, Naoto; Bando, Kyoko K.; Aiura, Yoshihiro; Mibu, Ko; Nishio, Keishi

Published

2020

Language

EN