Two-dimensional β-phase copper iodide: a promising candidate for low-temperature thermoelectric applications

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Cuprous iodide (CuI) is a p-type semiconductor with potential in electronics.
• Monolayer β-CuI, previously a high-temperature phase, is now synthesized at room temperature.
• Thermoelectric properties of monolayer β-CuI are currently unexplored.

Purpose of the Study:

• Investigate structural stability and thermoelectric capabilities of monolayer β-CuI and γ-CuI.
• Explore the potential of these materials for future electronic applications.
• Predict thermoelectric performance based on theoretical calculations.

Main Methods:

• Density Functional Theory (DFT) calculations.
• Boltzmann transport theory.
• Systematic investigation of structural stability and thermoelectric coefficients.

Main Results:

• Monolayer β-CuI exhibits superior thermoelectric properties compared to γ-CuI.
• Optimal zT values for monolayer β-CuI exceed 1.00 at room temperature (Zigzag and AC directions).
• γ-CuI shows zT values of 0.25 (n-type) and 0.74 (p-type) at 300 K.

Conclusions:

• Monolayer β-CuI demonstrates significant potential for low-temperature thermoelectric applications.
• The study highlights the promising thermoelectric performance of β-CuI.
• Further research into CuI-based materials is warranted for advanced electronic devices.