Structure and optical properties of Sn doped delafossite oxides CuGaO₂ by hydrothermal method

abstract

CuGa_1-×Sn_×O₂ (0 ≤ × ≤ 0.1427) samples were synthesized by convenient hydrothermal method. The crystal structure and optical properties were also investigated. Results revealed that the CuGa_1-×Sn_×O₂ samples are delafossite oxides with a rhombohedral (space group R-3m) structure; the XPS spectra confirmed that the valence state of Sn is +4. Increasing the concentration of doped Sn atoms decreased the band gap from 3.83 eV to 3.45 eV. The offset of the X-ray diffraction pattern and the change in transmittance indicated that the critical threshold was reached when the Sn concentration reached 6.23 at.%.

Keywords:

• Chemical synthesis
• X-ray diffraction and optical properties

Funding

This work was supported by the Natural Science Foundation for Distinguished Young Scholars of Xinjiang (Grant No. 2013711007) and Natural Science Foundation of China (Grant Nos. 10864004, 11164026, 51172193).