Analysis of spectral photocurrent response from multi-junction solar cells under variable voltage bias

Electrical and optical characterization of monolithically integrated multi-junction (MJ) solar cells is complicated by the fact that the internal subcells are not directly accessible. Two important characteristics of the MJ solar cell are the internal subcell I-V curves and the spectral photocurrent...

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Published in2010 35th IEEE Photovoltaic Specialists Conference pp. 000712 - 000716
Main Authors Lim, S H, O'Brien, K, Steenbergen, E H, Jing-Jing Li, Ding Ding, Yong-Hang Zhang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2010
Subjects
Current measurement
Indium gallium arsenide
Junctions
Photoconductivity
Photovoltaic cells
Voltage measurement
Wavelength measurement
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Summary:Electrical and optical characterization of monolithically integrated multi-junction (MJ) solar cells is complicated by the fact that the internal subcells are not directly accessible. Two important characteristics of the MJ solar cell are the internal subcell I-V curves and the spectral photocurrent response. Techniques to obtain the subcell I-V curves as well as the spectral photocurrent response have been well demonstrated, however, the close connection between these two different measurements has not been exploited. Using small signal analysis, we establish the relationship between the subcell I-V response and the voltage dependence of the spectral photocurrent response. By an inverse analysis, we also show how to derive the subcell I-V curves from the voltage dependent spectral photocurrent response, providing a new and independent technique to extract the internal subcell I-V curves.
ISBN:9781424458905
1424458900
ISSN:0160-8371
DOI:10.1109/PVSC.2010.5617046