Determination of subcell I-V characteristics of multijunction solar cells using optical coupling
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A method for the determination of the subcell I-V characteristics of multijunction solar cells in the presence of optical coupling is presented and applied to a GaInP/GaInAs/Ge triple-junction solar cell. Each of the subcells is described by a two-diode model and can be illuminated by a narrowband light source externally. Optical coupling is then used explicitly to generate current in one subcell, which is not illuminated externally. This approach yields the magnitude of optical coupling and a relationship between the two diode parameters of each subcell. The remaining cell parameters are determined with the help of pulsed illumination. In this fashion, the open circuit voltage of individual subcells is accessible, despite the fact that not all junctions are illuminated.
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Nesswetter H; Jost N; Lugli P; Bett A; Zimmermann C (American Institute of Physics Inc., 2015)The open circuit voltage of a single subcell in a multijunction cell stack can be measured with the help of pulsed, millisecond illumination. This concept makes use of the fact that the charging of the non-illuminated cell ...
Rutzinger M; Salzberger M; Nesswetter H; Lackner D; Bett A; Lugli P; Zimmermann C (IEEE Electron Devices Society, 2017)The photocurrent versus open-circuit voltage characteristic of individual subcells in a multijunction solar cell can be measured by illuminating the subcell with a pulse sequence of spatially homogeneous laser light. In ...
Rutzinger M; Salzberger M; Gerhard A; Nesswetter H; Lugli P; Zimmermann C (American Institute of Physics Inc., 2017)A method for measuring subcell capacitance voltage (C-V) in a multijunction solar cell is introduced. The subcell of interest is illuminated by a monochromatic light pulse with a ns rise time. The subcell capacitance is ...