Prof. Takahisa Omata Profile

Prof. Takahisa Omata

Associate Professor at Tohoku University

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Proceedings Article | 13 March 2015 Paper

Ternary and quaternary wurtzite-type oxide semiconductors: new materials and their properties

T. Omata

Proceedings Volume 9364, 93641L (2015) https://doi.org/10.1117/12.2175570

KEYWORDS: Semiconductors, Oxides, Zinc oxide, Diffraction, Ions, P-type semiconductors, Group II-VI semiconductors, Absorption, Group III-V semiconductors, Semiconductor materials

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β-NaFeO₂ structure is an orthorhombic wurtzite-derived structure, of which the structural relationship with wurtzite structure is similar to that of the chalcopyrite sturcture with zincblende structure. β-LiGaO₂, β-AgGaO₂ and β-AgAlO₂ are known as materials possessing the β-NaFeO₂ structure; however, studies on the wurtzite-derived ternary oxide semiconductors are quite limited. Recently, we demonstrated the band gap engineering of zinc oxide by alloying with wurtzite-type β-AgGaO₂, and the band gap of ZnO was reduced to 2.55 eV by this alloying. Very recently, a new wurtzite-type ternary compound, β-CuGaO₂, was found out. Its energy band gap was 1.47 eV, and it exhibited p-type conduction. The first principle calculation indicated that β-CuGaO₂ is a direct semiconductor; therefore it is suitable to use in optoelectronic devices. Taking the 1.47 eV of the band gap and p-type electronic conduction into account, β- CuGaO₂ is a promising material for the thin film solar cell absorber. These new ternary oxide semiconductors possessing wurtzite-derived structure expanded the energy region that the oxide semiconductors cover into visible and near-infrared region.

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