Case 15281

Thermally Stable Nano Structure for Selective Emitter

Keywords:

Tungsten Selective Emitters, thermophotovoltaic (TPV) systems, Flat Surface Tungsten Photonic Crystal (FSTPC), solar thermal photovoltaics

Applications:

Solar Thermal Photovoltaics

Problem:

Photonic crystals have periodic nano-structures to control the motion of photons at certain wavelengths, giving off light radiation at favorable wavelengths to be absorbed by the adjacent PV cells. These nano-structures lose their structural integrity at high temperatures, which disrupt the tight tolerances required for spectral control of light radiation.

Technology:

This invention aims to provide high temperature stability of tungsten selective emitters using the Flat Surface Tungsten Photonic Crystal (FSTPC). The air in nano-pits is replaced with damascened IR transparent ceramic material and coated with a surface diffusion barrier, resulting in a flattened emitter surface with a negligible second derivative of the curvature. This will minimize or eliminate the surface diffusion even at high temperatures.

Advantages:
  • Improved thermal stability at high temperatures

Inventors:
  • Professor Sang-Gook Kim(Department of Mechanical Engineering, MIT)
  • Heon Ju Lee (Department of Mechanical Engineering, MIT)
  • Stephen Paul Bathust (Department of Mechanical Engineering, MIT)

Intellectual Property:

US Patent Application Number 13/683704, filed on November 21, 2012

PCT Patent Application Number PCT/US2012/066327, filed on November 21, 2012

Publications:

N/A

Related Cases:

14212: A High Efficiency Micro-Thermophotovoltaic Generator System

14368: Angular Photonic Band Gap

Last revised: April 30, 2013

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