Silicide/Silicon Hetero-Junction Structure for Thermoelectric Applications

Area of Science:

• Materials Science
• Solid State Physics
• Nanotechnology

Background:

• Thermoelectric generators convert temperature differences into electrical energy via the Seebeck effect.
• Traditional thermoelectric materials face challenges in efficiency and cost.
• Novel material structures are needed to improve thermoelectric performance.

Purpose of the Study:

• To fabricate and evaluate silicide/silicon heterojunction thermoelectric devices.
• To reduce thermal conductivity by scattering phonons at silicide/silicon interfaces.
• To enhance the Seebeck coefficient and power factor for efficient thermoelectric energy generation.

Main Methods:

• Fabrication of silicide/silicon heterojunction structures using CMOS processes.
• Evaluation of electrical conductivity, Seebeck coefficient, and power factor using steady-state analysis.
• Assessment of temperature differences across the fabricated devices.

Main Results:

• Platinum silicide/silicon multilayered structures exhibited enhanced Seebeck coefficients and power factors, suitable for p-leg elements.
• Erbium silicide/silicon structures demonstrated improved Seebeck coefficients, considered for n-leg elements.
• Silicide/silicon structures showed reduced thermal conductivity and enhanced Seebeck coefficients, indicating potential for thermoelectric applications.

Conclusions:

• Silicide/silicon multilayered structures are promising for thermoelectric applications due to reduced thermal conductivity and enhanced Seebeck coefficients.
• The high thermal conductivity of silicon packing presents a challenge for maintaining temperature gradients, requiring further investigation.
• Further testing and analysis are necessary to overcome current limitations and optimize these devices for practical thermoelectric energy generation.