The structural, electronic, and optical properties of Ca2InAsO6 double perovskite oxide are studied using the full potential linearized augmented plane wave (FP-LAPW) method based on density functional theory (DFT). The tolerance factor (τ) and the octahedral factor (μ) of about 0.84 and 0.45 are calculated, respectively, confirming that this compound forms a stable structure. Our calculations revealed that Ca2InAsO6 is a semiconductor with a moderate Γ point direct bandgap of about 2.83 eV, obtained with the modified Becke-Johnson level of theory. Furthermore, optical properties show interesting phenomena, as this material exhibits a good absorption coefficient in the visible region of the spectrum. The tunable moderate bandgap and good optical absorption in the visible light region suggest that the double perovskite material is suitable for use in different electronic and optical applications, especially in new energy production applications.

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