Tunable Direct Band Gap of β‑CuGaO<sub>2</sub> and β‑LiGaO<sub>2</sub> Solid Solutions in the
Full Visible Range
Issei Suzuki
Yuki Mizuno
Takahisa Omata
10.1021/acs.inorgchem.8b03370.s001
https://acs.figshare.com/articles/journal_contribution/Tunable_Direct_Band_Gap_of_CuGaO_sub_2_sub_and_LiGaO_sub_2_sub_Solid_Solutions_in_the_Full_Visible_Range/7851683
We
synthesized solid solutions of β-CuGaO<sub>2</sub> and β-LiGaO<sub>2</sub> (i.e., β-(Cu<sub>1–<i>x</i></sub>Li<i><sub><i>x</i></sub></i>)GaO<sub>2</sub>) by partial
ion exchange of Cu<sup>+</sup> in β-CuGaO<sub>2</sub> with Li<sup>+</sup> from LiCl in the composition range of 0 ≤ <i>x</i> ≤ 0.89. The energy band gap of β-CuGaO<sub>2</sub> (1.47 eV) increased linearly up to 3.0 eV with increasing
Li content, covering the full visible range. The crystal structures
of the solid solutions were analyzed using the Rietveld method. The
structural distortions of the solid solutions with respect to the
ideal binary wurtzite-type structure were relatively small because
of the similar ionic radii of Li<sup>+</sup>, Cu<sup>+</sup>, and
Ga<sup>3+</sup>. Based on a recently proposed hypothesis relating
structural distortion to the nature of the band gap (i.e., direct
or indirect), it is expected that the solid solution has a direct
band gap. We anticipate that this solid solution system will contribute
to the realization of oxide-based optoelectronic devices.
2019-03-15 16:04:15
β- LiGaO 2
oxide-based optoelectronic devices
band gap
Full Visible Range
energy band gap
eV
β- CuGaO 2
i.e
distortion
solution