Thermophotovoltaic generation with selective radiators based on tungsten surface gratings
Abstract
Two-dimensional surface-relief gratings with a period of 1.0-0.2μm composed of rectangular microcavities were fabricated on single crystalline W substrates to develop spectrally selective radiators for thermophotovoltaic generation. The radiators displayed strong emission in the near-infrared region where narrow-band-gap photovoltaic cells could convert photons into electricity. The enhancement of thermal emission was attributed to the microcavity effect. Power generation tests were carried out and the W gratings showed more than two times higher generation efficiency, compared to a SiC radiator. The results showed that the microstructured W radiators behave as good selective radiator, with both high efficiency and high power density.
- Publication:
-
Applied Physics Letters
- Pub Date:
- October 2004
- DOI:
- 10.1063/1.1807031
- Bibcode:
- 2004ApPhL..85.3399S
- Keywords:
-
- 84.60.Jt;
- 85.60.Dw;
- 42.79.Dj;
- 78.20.Ci;
- 78.66.Fd;
- 78.30.Fs;
- Photoelectric conversion: solar cells and arrays;
- Photodiodes;
- phototransistors;
- photoresistors;
- Gratings;
- Optical constants;
- III-V semiconductors;
- III-V and II-VI semiconductors