Chlorine and zinc co-doping effects on the electronic structure and optical properties of γ-CuI
arxiv(2024)
摘要
The effects of chlorine (Cl) and zinc (Zn) co-doping on the electronic
structure and optical properties of the zinc blende (γ) phase of copper
iodide (γ-CuI) scintillator material are investigated by using
first-principles density functional theory calculations. The band structure,
density of states, dielectric function, absorption coefficients, and
reflectivity were analyzed before and after doping. Results show co-doping
significantly modifies the band structure, reduces the band gap, and generates
impurity energy levels. Cl doping enhances absorption in the high energy region
while reducing visible light absorption. Zn doping induces a redshift in
absorption and n-type conductivity at high concentrations. With suitable
co-doping ratios, the absorption coefficient and reflectivity of γ-CuI
can be optimized in the visible range to improve scintillation light yield. The
calculations provide guidance for co-doping γ-CuI scintillators to
achieve superior detection performance. The n-type conductivity also makes
doped γ-CuI promising for optoelectronic applications.
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