Semimetal/semiconductor nanocomposites for thermoelectrics

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Thermoelectric materials are crucial for waste heat recovery and solid-state cooling.
• Developing efficient p-type and n-type thermoelectric materials remains a key challenge.
• Semimetal-semiconductor nanocomposites offer tunable properties for improved thermoelectric performance.

Purpose of the Study:

• To investigate rare earth-group V (RE-V) semimetal-semiconductor nanocomposites for thermoelectric applications.
• To focus on ErSb embedded in In(x)Ga(1−x)Sb as a promising p-type thermoelectric material.
• To engineer thermoelectric properties for enhanced device performance.

Main Methods:

• Growth of semimetal-semiconductor nanocomposites using molecular beam epitaxy (MBE).
• Embedding nanostructures of RE-V compounds within a III-V semiconductor matrix.
• Co-doping to achieve both n-type and p-type materials.

Main Results:

• Demonstrated the fabrication of ErSb:In(x)Ga(1−x)Sb as a promising p-type thermoelectric material.
• Successfully engineered thermoelectric properties through nanocomposite formation and doping.
• Fabricated and measured segmented thermoelectric power generator modules using Er-containing nanocomposites.

Conclusions:

• Semimetal-semiconductor nanocomposites, particularly ErSb in III-V matrices, are viable for advanced thermoelectric applications.
• Co-doping strategies enable the creation of both n-type and p-type thermoelectric materials.
• The research contributes to the development of efficient thermoelectric devices through material engineering.