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Determination of the subcell photovoltage in multijunction solar cells via voltage-dependent capacitance analysis

: Hoheisel, R.; Schachtner, M.; Stämmler, E.; Bett, A.W.


Applied Physics Letters 98 (2011), No.25, Art. 251106, 3 pp.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Journal Article
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; alternative Photovoltaik-Technologie

The letter describes a method for determining the photovoltage, i.e., the quasifermi level splitting at open-circuit conditions, associated with each subcell in a series connected multijunction solar cell structure by voltage-dependent capacitance analysis. Experimental verification and accuracy analysis of subcell photovoltage determination is provided for a 6-tuple AlGaInP/GaInP/AlGaInAs/GaInAs/GaInNAs/Ge solar cell device.