Results of the Solar Cell Experiments on the NTS-2 Satellite after 223 Days in Orbit.
Memorandum rept. Jun 76-Apr 78,
NAVAL RESEARCH LAB WASHINGTON D C
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Results after 223 days in orbit of the solar cell experiments aboard the NTS-2 satellite are presented. The objective of the solar cell experiment, consisting of fifteen 15 separate experiments of five cells each, is to evaluate the performance of state-of-the-art solar cells in the space environment. These experiments will answer questions that have arisen from the previous NTS-1 solar cell experiments such as the need for ultraviolet rejection filters in space solar cell systems, space qualification of electrostatic bonding techniques for solar cell converslides, and the improved efficiency to be realized from the use of texture cell surfaces. In addition, a gallium arsenide GaA1AsGaAs solar cell module is being flight tested. The average value of Isc measured in space on the first day of exposure agreed with solar simulator values to within 1.41 or - 0.99 percent. The agreement between Voc in space with solar simulator values was 1.24 or - 1.08 percent. After 223 days in orbit, the loss in power ranged from 4.6 percent to 46.5 percent with the exception of the Solarex low-cost space cell which became open-circuited on the 69th day. Results are given of the changes in the photovoltaic parameters of each of the experiments. Author
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