We propose in this work a structure of semiconductor thin films combined with a one-dimensional metallic grating, which allows for selective improvement of thermal radiative absorptivity (also emissivity) of the structure. Both shallow and deep gratings are considered in this work. Our numerical results obtained with a 2D rigorous coupled-wave analysis algorithm demonstrate that the proposed structure exhibits enhanced spectral absorptivity for photon energy slightly above the gap energy of the semiconductor (silicon in this work). Furthermore, the selectively improved absorptivity can be obtained in a wide range of incidence angles. As such, much smaller thickness of the semiconductor layer is required to absorb the same amount of high energy photons than in a conventional Si-based photovoltaic device. In addition, absorptivity for low energy photons in the new structure is lower due to the smaller semiconductor layer thickness. Therefore, the new structure may have potential applications in energy conversion devices.
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Micro/Nanoscale Heat Transfer—Part I
Semiconductor Thin Films Combined With Metallic Grating for Selective Improvement of Thermal Radiative Absorption/Emission
C. J. Fu,
C. J. Fu
LTCS and Department of Mechanics and Aerospace Engineering, College of Engineering,
e-mail: cjfu@pku.edu.cn
Peking University
, Beijing 100871, China
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W. C. Tan
W. C. Tan
LTCS and Department of Mechanics and Aerospace Engineering, College of Engineering,
Peking University
, Beijing 100871, China
Search for other works by this author on:
C. J. Fu
LTCS and Department of Mechanics and Aerospace Engineering, College of Engineering,
Peking University
, Beijing 100871, Chinae-mail: cjfu@pku.edu.cn
W. C. Tan
LTCS and Department of Mechanics and Aerospace Engineering, College of Engineering,
Peking University
, Beijing 100871, ChinaJ. Heat Transfer. Mar 2009, 131(3): 033105 (8 pages)
Published Online: January 21, 2009
Article history
Received:
January 28, 2008
Revised:
July 22, 2008
Published:
January 21, 2009
Citation
Fu, C. J., and Tan, W. C. (January 21, 2009). "Semiconductor Thin Films Combined With Metallic Grating for Selective Improvement of Thermal Radiative Absorption/Emission." ASME. J. Heat Transfer. March 2009; 131(3): 033105. https://doi.org/10.1115/1.3056599
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