Homo-layer flexible Bi₂Te₃-based films with high thermoelectric performance.

Area of Science:

• Materials Science
• Solid-State Physics
• Thermoelectrics

Background:

• Flexible thermoelectric materials are crucial for energy harvesting and electronics cooling.
• Scalable and sustainable manufacturing of high-performance thermoelectric films remains a challenge.

Purpose of the Study:

• To demonstrate a novel, scalable, and sustainable manufacturing process for flexible n-type Bismuth Telluride (Bi2Te3) films.
• To investigate the structure-property relationships and optimize thermoelectric performance through homo-layer fusion engineering.

Main Methods:

• Utilized physical vapor deposition (PVD) for film fabrication.
• Employed homo-layer fusion engineering to enhance thermoelectric properties.
• Characterized film performance at room temperature, focusing on power factor and thermal conductivity.

Main Results:

• Achieved ultrahigh power factor (up to 30.0 µW/cm·K²) and ultralow lattice thermal conductivity (0.38 W/m·K).
• Demonstrated a maximum output power density of 300 W/m² at a 60 K temperature gradient.
• Obtained a normalized cooling factor of 0.6, suitable for consumer electronics with large-area manufacturing (up to 120 cm²).

Conclusions:

• The developed homo-layer deposition method is industry-compatible, scalable, and cost-effective.
• This approach offers a facile strategy for manipulating inorganic semiconductor properties for thermoelectric applications.
• The findings pave the way for advanced solid-state electronic fabrication in heat harvesting and management.