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III-V solar cells - materials, multi-junction cells - cell design and performance

: Dimroth, F.


Reinders, A.:
Photovoltaic solar energy. From fundamentals to applications
Chichester: Wiley, 2017
ISBN: 978-1-118-92746-5
ISBN: 978-1-118-92748-9
ISBN: 978-1-118-92747-2
Book Article
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; III-V und Konzentrator-Photovoltaik; III-V Epitaxie und Solarzellen; solar cells

Electronic and optoelectronic devices such as transistors, lasers and photodetectors have developed in parallel to III-V multi-junction solar cells, and over time new material compositions and hetero-structures became available. The overall advantage of multi-junction solar cells is the simultaneous reduction of transmission and thermalization losses. This leads to an increase in efficiency which can be predicted based on thermodynamic considerations of detailed balance between the sun and the solar cell absorber. This chapter discusses the most important prerequisites for reaching highest performance devices. The device optimization goes through the steps of: such as minimizing reflection by an anti-reflection coating, minimizing grid shadowing, realizing excellent crystalline quality to avoid non-radiative recombination in the bulk and at interfaces. The technology of wafer bonding allows the combination of the best absorber materials in a multi-junction cell and this will certainly lead to new performance records in the future.