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2013
Conference Paper
Titel
Overview about technology perspectives for high efficiency solar cells for space and terrestrial applications
Abstract
III-V multi-junction solar cells have become standard in space and in terrestrial concentrator systems. The current landmark for III-V multi-junction solar cells is the Ga0.50In0.50P/Ga0.99In0.01As/Ge triple-junction, which only contains lattice-matched layers. This MOVPE-grown device is available from different suppliers in large quantities. Due to the mature development status of this device new concepts are being investigated to increase the efficiencies further. A toolbox of new ideas and methods is available such as metamorphic and/or inverted growth, wafer bonding, different substrates, nanostructures, MBE growth and new materials. These have been used and combined intensively in recent years to develop and realize new structures of III-V multi-junction solar cells. This paper gives an overview about the technology perspectives and research trends in III-V multi-junction solar cells. Eventually, a new record efficiency value of 44.7% @ 297xAM1.5d for a 4-junction wafer-bonded solar cell is presented.
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