27.6% Efficiency (1 sun, air mass 1.5) monolithic AlGa As/GaAs two-junction cascade solar cell with prismatic cover glass
Applied Physics Letters, ISSN: 0003-6951, Vol: 55, Issue: 17, Page: 1741-1743
1989
- 60Citations
- 11Captures
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Article Description
A 27.6% efficiency measured under 1 sun, air mass 1.5 illumination has been achieved in a two-terminal, monolithic two-junction cascade solar cell consisting of an AlGaAs (E=1.93 eV) upper cell and a GaAs lower cell. The component cells were electrically connected together using a metal-interconnect contact fabricated during post-growth processing. Also, a prismatic cover glass was bonded to the front surface of the cascade structure to minimize the obscuration effect introduced by the grid lines and metal-interconnect contacts. As the cascade cell was operated under air mass 0 illumination, an efficiency of 23.0% was obtained. Both results represent the highest 1 sun efficiencies ever reported. The implications of achieving this high efficiency in a two-junction cascade solar cell for terrestrial and space applications are also described.
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