Modulated photocurrent spectroscopy of CdTe/CdS solar cellsaequivalent circuit analysis

Modulated photocurrent spectroscopy was used to investigate the dynamic response of charge carrier transport in thin film CdTe/CdS solar cells. The impact of light bias and temperature over a broad excitation frequency range were measured. The observed features of the data, including a photocurrent...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2013-09, Vol.116, p.126-134
Main Authors: Hamadani, B H, Roller, J, Kounavis, P, Zhitenev, N B, Gundlach, D J
Format: Article
Language:English
Subjects:
Cadmium tellurides
Charge carriers
Mathematical models
Photocurrent
Photoelectric effect
Semiconductors
Solar cells
Spectroscopy
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Summary:Modulated photocurrent spectroscopy was used to investigate the dynamic response of charge carrier transport in thin film CdTe/CdS solar cells. The impact of light bias and temperature over a broad excitation frequency range were measured. The observed features of the data, including a photocurrent aphase-leada and a aphase-laga over different regions of the frequency spectrum, were explored in the context of an equivalent circuit model. Comparisons between the model's predicted performance and the measured data suggest that charge carrier recombination at the cell's back metal/semiconductor contact is the main source of photocurrent loss in these devices.
ISSN:0927-0248
DOI:10.1016/j.solmat.2013.04.011