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Lightweight (AlGaAs)GaAs/CuInSe/sub 2/ tandem junction solar cells for space applications

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7 Author(s)
Kim, N.P. ; Boeing Aerosp. & Electron., Seattle, WA, USA ; Stanbery, B.J. ; Burgess, R.M. ; Mickelsen, R.A.
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Mechanically stacked tandem cells consisting of GaAs thin-film upper cells and CuInSe/sub 2/ thin-film lower cells have been developed to meet the increasing power needs projected for future spacecraft. The authors report the fabrication of the first highly efficient lightweight GaAs/CuInSe/sub 2/ tandem cell on a 2-mil thick substrate, update recent performance improvements in thin-film GaAs/CuInSe/sub 2/ tandem cells, and discuss their application to space power systems. The efficiency of 4-cm/sup 2/ cells has improved to 21.6% AM0, the highest ever reported for a thin-film photovoltaic cell. Lightweight 4-cm/sup 2/ tandem cells have been successfully fabricated with efficiencies as high as 20.8%. These cells weighed about 180 mg without optimized substrate trimming. Radiation and operating temperature effects on GaAs/CuInSe/sub 2/ tandem cells are also discussed, and an interconnect scheme to form a voltage-matched string is described.<>

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Aerospace and Electronic Systems Magazine, IEEE  (Volume:4 ,  Issue: 11 )