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Electrical power generation from moderate-temperature radiative thermal sources.

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Researchers converted waste heat into electricity using a novel CMOS tunnel diode. This technology efficiently generates power from moderate-temperature thermal sources, offering potential for energy saving and powering electronics.

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Area of Science:

  • Energy Conversion
  • Materials Science
  • Semiconductor Physics

Background:

  • Moderate-temperature thermal sources (100°–400°C) generate waste heat as a byproduct of various industrial and computational processes.
  • Efficiently harvesting this radiated waste heat remains a significant challenge in energy recovery.

Purpose of the Study:

  • To demonstrate the conversion of thermal radiation into electrical power.
  • To investigate a novel bipolar grating-coupled complementary metal-oxide-silicon (CMOS) tunnel diode for this application.

Main Methods:

  • Utilized a bipolar grating-coupled CMOS tunnel diode.
  • Employed a two-step photon-assisted tunneling charge pumping mechanism.
  • Experimentally tested with broadband blackbody thermal sources.

Main Results:

  • Achieved electrical power generation from thermal radiation.
  • Demonstrated converted power densities of 27 to 61 microwatts per square centimeter.
  • Observed power generation from thermal sources between 250°C and 400°C.

Conclusions:

  • The developed CMOS tunnel diode enables scalable and efficient conversion of radiated waste heat into electrical power.
  • This technology can reduce overall energy consumption.
  • Potential applications include powering electronics and sensors using waste heat.