High efficiency GaAs/Ge monolithic tandem cells for space-concentrator arrays. Phase 1. Interim report, Aug 88-Aug 89

Technical Report · Wed May 01 04:00:00 EDT 1991

OSTI ID:6242001

Wojtczuk, S J

The goal of this program is to develop a 30 percent efficient 2-junction solar cell that is monolithic, two terminal, and that will operate in 25-100x solar concentrator elements with operating temperatures of 75-100 deg C. The cell design is a GaAs/Ge compound configuration with the Ge bottom cell utilizing the .9-1.8 micrometer portion of the AM0 solar spectrum and contributing 7 percent to the total stack efficiency. During the first Phase of this effort individual component cells were developed that had efficiencies of 22% for Gallium Arsenide and 6% for Germanium. Monolithically grown 2-junction devices were also fabricated with efficiencies exceeding 20% when characterized at the defined operating temperatures and solar concentration. (Author)

• Research Organization: Spire Corp., Bedford, MA (United States)
• OSTI ID: 6242001
• Report Number(s): AD-A-239931/9/XAB; CNN: F33615-88-C-2844
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
141000 -- Solar Collectors & Concentrators
DESIGN
DIRECT ENERGY CONVERTERS
EFFICIENCY
ELEMENTS
EQUIPMENT
FABRICATION
GALLIUM ARSENIDE SOLAR CELLS
GERMANIUM
METALS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SOLAR CELL ARRAYS
SOLAR CELLS
SOLAR EQUIPMENT