STUDY OF A THERMOPHOTOVOLTAIC CONVERTER.
Final rept., 1 Jan-31 Dec 63.
GM DEFENSE RESEARCH LABS SANTA BARBARA CALIF
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Components for a portable thermophotovoltaic energy converter have been investigated experimentally and theroretically. Using a newly designed reflectance goniometer, reflectance values were measured for specular front-surface gold-on-germanium 98.3, for specular front-surface germanium and rear-surface germanium-gold combined 92.7, and for a rougher scattering front-surface gold-on-germanium 97.4. It appears that adequately transparent germanium cells can be made with a 4 long-wavelength transmission loss per round trip, with acceptable Fermi and doping levels. Neither gallium antimonide nor indium arsenide shows promise as an alternative to germanium. For burner mantle materials, SiC shows promise. The reflectance measurements on Cr-CoFe oxide-stained alumina indicate that the emissivity may be as high as 0.95 stained oxides may therefore also be suitable. Design studies for a burner with 30 stack loss were completed. Author