Accession Number : AD0462029


Title :   STUDY OF A THERMOPHOTOVOLTAIC CONVERTER.


Descriptive Note : Rept. no. 3 (Final), 10 Nov 64-14 Jan 65.


Corporate Author : GM DEFENSE RESEARCH LABS SANTA BARBARA CA


Report Date : Apr 1965


Pagination or Media Count : 39


Abstract : Convective and radiative loss measurements were refined on a model TPV system using a calorimeter in vacuum and air. The system has an inner cylindrical mantle (3.75-cm radius) heated internally by conventional fuels, a concentric photocell mount (12.5-cm radius), and reflecting end-mirrors. Power losses in the model system were 0.3 kw to the bottom mirror and 0.4 kw to the top (in vacuum), with additional losses in air (convective losses) of 0.07 kw to the bottom, 0.25 kw to the cylinder, and 0.3 kw to the top. Sample studies showed that highly reflecting ohmic contacts can be produced with a resistance of 0.001 ohm/sq. cm. on p-type, and 0.1 ohm/sq. cm. on lightly doped n-type. Additional cells of the 'non-absorptive' type were produced. Wafers prepared under similar conditions were anti-reflection-coated on both surfaces for maximum transmission at 2.35 microns. The oneway absorption was found to be 3.4%. The devices performed as well or better than the earlier ones. (Author)


Descriptors :   *PHOTOELECTRIC CELLS(SEMICONDUCTOR) , *POWER SUPPLIES , *ENERGY CONVERSION , GERMANIUM , PHOTOELECTRIC CELLS(SEMICONDUCTOR) , PHOTOELECTRIC CELLS(SEMICONDUCTOR) , LIGHT TRANSMISSION , INFRARED RADIATION , REFLECTION , OPTICAL COATINGS , MIRRORS , PERFORMANCE(ENGINEERING) , ELECTRIC POWER PRODUCTION , MEASUREMENT , INSTRUMENTATION , ELECTRICAL RESISTANCE , VOLTAGE , ELECTRIC CURRENT , HEAT EXCHANGERS , THERMIONIC CONVERTERS , SILICON COMPOUNDS , CARBIDES , FUELS , HYDROCARBONS , PORTABLE EQUIPMENT


Distribution Statement : APPROVED FOR PUBLIC RELEASE