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Thermally Stable Two-Dimensional Photonic Crystal for Selective Emitters

Published online by Cambridge University Press:  18 March 2013

Heon J. Lee ,
Stephen P. Bathurst  and
Sang-Gook Kim
Heon J. Lee
Affiliation:
Center for Computation Science, Korea Institute of Science and Technology, Seoul, 136-791, Korea.
Stephen P. Bathurst
Affiliation:
Luxvue Technology Corporation, Mountain View, CA 94035, U.S.A.
Sang-Gook Kim
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.
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Abstract

A fundamental challenge in solar-thermal-electrical energy conversion is the thermal stability of materials and devices at high operational temperatures. This study focuses on the thermal stability of selective emitters for solar thermophotovoltaic (STPV) systems to enhance the conversion efficiency. 2-D photonic crystals are periodic micro/nano-scale structures that are designed to affect the motion of photons at certain wavelengths. The structured patterns, however, lose their structural integrity at high temperature, which disrupts the tight tolerances required for spectral control of the thermal emitters. Through analytical studies and experimental observations, the four major mechanisms of thermal degradation of 2-D photonic crystal are identified: oxidation, grain growth and re-crystallization, surface diffusion, and evaporation and re-condensation. In this work, the design of a flat surface photonic crystal (FSPC) is proposed and experimental validations are performed.

Keywords

coatingphotovoltaicdiffusion
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1497: Symposium K – Hierarchically Structured Materials for Energy Conversion and Storage , 2013 , mrsf12-1497-k03-23
Copyright
Copyright © Materials Research Society 2013

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References

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