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Researchers enhanced direct thermal-to-electric energy converters by breaking spatial symmetry. This nonlinear approach significantly boosts the fill factor (FF) and maximum power output, improving device performance.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Energy Conversion

Background:

  • Direct thermal-to-electric energy converters often operate linearly, limiting their efficiency.
  • The fill factor (FF), a measure of power conversion efficiency, typically remains low (0.25) in linear devices.

Purpose of the Study:

  • To investigate nonlinear effects for enhancing the performance of thermal-to-electric energy converters.
  • To explore the role of spatial symmetry in improving the fill factor and maximum power output.

Main Methods:

  • Theoretical analysis based on fundamental symmetry considerations.
  • Experimental study of nonlinear thermoelectric transport across an asymmetric energy barrier in a semiconductor nanowire.

Main Results:

  • Identified that nonlinear terms increasing the FF require broken spatial symmetry.
  • Demonstrated experimentally and theoretically that asymmetric energy barriers enhance FF and maximum power.
  • Achieved higher performance through geometric symmetry breaking and nonlinear design.

Conclusions:

  • Breaking spatial symmetry is a key strategy for improving thermoelectric device performance.
  • Nonlinear thermoelectric transport in asymmetric structures offers a pathway to overcome limitations of linear devices.
  • This approach is applicable to enhancing both thermoelectric and hot-carrier devices.