APPLIED RESEARCH PROGRAM ON HIGH TEMPERATURE RADIATION RESISTANT SOLAR CELL ARRAY, VOLUME I.
Annual rept., 15 Apr 62-14 Apr 63.
RADIO CORP OF AMERICA PRINCETON N J DEFENSE ELECTRONIC PRODUCTS
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A total of 780 cells was produced with efficien cies of up to 10 and with a mode effeciency of eight percent for the later units. Tests of the cells made at elevated temperatures and in high radiation environments have established the characteristics of the cells. The critical flux for the gallium arsenide cells equalled or ex ceeded that of silicon cells. Tests of cadmium sulfide cells were not judged sufficiently con clusive to establish the level of critical flux. Soldering techniques were developed and evaluated in terms of the effects upon finished cells. Thermal characteristics of the cells and panels were appraised in terms of orbital evaluation. Panel assembly techniques were developed and evaluated in terms of the electrical and mechani cal considerations involved in integrating cells into panels. Investigation and fabrication of single-crystal, thin-film gallium arsenide cells were made. Evaluation of methods for depositing epitaxial films, techniques for producing the desired doping structure, and studies of the resultant photovoltaic and surface-contacting properties were made for thin-film GaAs. Author