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Effects of surface diffusion on high temperature selective emitters.

Daniel Peykov, Yi Xiang Yeng, Ivan Celanovic

|May 14, 2015

Summary

This summary is machine-generated.

Surface diffusion degrades selective emitter efficiency in tantalum photonic crystals. Optimizing structure design, like using rounded cavities, enhances efficiency and diffusion resistance.

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Area of Science:

Materials Science
Optical Physics
Nanotechnology

Background:

Selective emitters are crucial for thermophotovoltaic applications.
Surface diffusion can degrade the performance of photonic crystal structures at high temperatures.
Understanding these degradation mechanisms is vital for designing robust devices.

Purpose of the Study:

To investigate the impact of surface diffusion on the efficiency of 1D tantalum photonic crystals at 1200K.
To identify structural parameters that mitigate performance degradation.
To present an optimized structure with high efficiency and diffusion resistance.

Main Methods:

Morphological and optical simulations were employed.
Simulations focused on 1D tantalum photonic crystals at 1200K.
Analysis involved evaluating changes in resonance peaks, emissivity, cavity dimensions, and aperture width.

Main Results:

Surface diffusion was found to gradually reduce selective emitter efficiency.
Resonance peak shifts and declining emissivity were attributed to changes in cavity dimensions and aperture width.
Decreasing structure curvature (larger periods, smaller cavities) and using rounded cavities alleviated degradation.

Conclusions:

Surface diffusion poses a significant challenge to the long-term efficiency of tantalum photonic crystals.
Structural modifications, specifically reducing curvature and incorporating rounded cavities, can effectively combat performance loss.
An optimized structure demonstrates both high selective emissivity and resilience against surface diffusion, paving the way for improved thermophotovoltaic devices.