Controlled conditioning of a-Si:H thin film modules for efficiency prediction

It is known for a-Si:H modules that seasonal variations in performance occur because of the effects of meta-stable degradation mechanisms. These changes in Standard Test Condition (STC) performance are driven by the history of exposure to light and temperature with different time constants and therm...

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Bibliographic Details
Published in:Thin solid films 2008-08, Vol.516 (20), p.6902-6906
Main Authors: Nikolaeva-Dimitrova, M., Kenny, Robert P., Dunlop, Ewan D.
Format: Article
Language:English
Subjects:
a-S:H modules
Applied sciences
Controlled conditioning
Efficiency prediction
Energy
Exact sciences and technology
Natural energy
Photovoltaic conversion
Seasonal variations
Solar cells. Photoelectrochemical cells
Solar energy
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Summary:It is known for a-Si:H modules that seasonal variations in performance occur because of the effects of meta-stable degradation mechanisms. These changes in Standard Test Condition (STC) performance are driven by the history of exposure to light and temperature with different time constants and thermal annealing activation energies. The present study provides a link between performance changes following varied indoor controlled conditioning and during outdoor exposure through different seasons. Varying exposure conditions were simulated indoor at different light levels and temperatures as functions of time. During these controlled conditioning experiments the extrapolated STC performance was found to change significantly, and coefficients determining the change in efficiency as a function of light and temperature exposure have been estimated. Using these coefficients the module performance has been modelled as a function of real irradiance and temperature variations over a year leading to a good match to the actual measured performance over the same year.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2007.12.059