TY - JOUR
T1 - Tunable Direct Band Gap of β-CuGaO 2 and β-LiGaO 2 Solid Solutions in the Full Visible Range
AU - Suzuki, Issei
AU - Mizuno, Yuki
AU - Omata, Takahisa
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for Scientific Research (B) (Grant No. 26289239) and a Grant-in-Aid for Scientific Research (A) (Grant No. 17H01315).
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - We synthesized solid solutions of β-CuGaO 2 and β-LiGaO 2 (i.e., β-(Cu 1-x Li x )GaO 2 ) by partial ion exchange of Cu + in β-CuGaO 2 with Li + from LiCl in the composition range of 0 ≤ x ≤ 0.89. The energy band gap of β-CuGaO 2 (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 + , Cu + , and Ga 3+ . 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.
AB - We synthesized solid solutions of β-CuGaO 2 and β-LiGaO 2 (i.e., β-(Cu 1-x Li x )GaO 2 ) by partial ion exchange of Cu + in β-CuGaO 2 with Li + from LiCl in the composition range of 0 ≤ x ≤ 0.89. The energy band gap of β-CuGaO 2 (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 + , Cu + , and Ga 3+ . 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.
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U2 - 10.1021/acs.inorgchem.8b03370
DO - 10.1021/acs.inorgchem.8b03370
M3 - Article
C2 - 30875215
AN - SCOPUS:85063144050
VL - 58
SP - 4262
EP - 4267
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 7
ER -