Thermoelectric characterization of flexible micro-thermoelectric generators

Area of Science:

• Materials Science
• Energy Conversion
• Mechanical Engineering

Background:

• Thermoelectric generators (TEGs) offer a promising avenue for waste heat recovery and portable power generation.
• Characterizing flexible TEGs under mechanical stress is essential for their practical application.
• Existing characterization methods often lack the versatility to test devices under diverse environmental and mechanical conditions.

Purpose of the Study:

• To introduce a new experimental setup for comprehensive characterization of flexible micro-thermoelectric generators.
• To enable precise measurement of power generation and thermoelectric conversion efficiency under mechanical stress and deformation.
• To validate the system's performance using both commercial rigid and custom flexible TEGs.

Main Methods:

• Development of a versatile experimental setup capable of testing devices in atmospheric and vacuum environments.
• Integration of precise temperature control (293 K-423 K) and measurement (±0.02 K uncertainty).
• Systematic evaluation of device performance as a function of load resistance, mechanical pressure, and applied stresses.

Main Results:

• Demonstrated repeatability within 5% for power generated and 3% for conversion efficiency.
• Successful characterization of both rigid commercial devices and a flexible organic-inorganic hybrid generator.
• Accuracy ensured through meticulous minimization of heat flux losses.

Conclusions:

• The developed experimental setup provides a reliable and accurate platform for characterizing flexible micro-thermoelectric generators.
• The system's versatility allows for in-depth analysis of device performance under realistic operating conditions.
• This work facilitates the advancement and optimization of flexible thermoelectric power generation technologies.