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Outdoor performance of organic photovoltaics: Diurnal analysis, dependence on temperature, irradiance, and degradation

Bristow, N. and Kettle, J. (2015) Outdoor performance of organic photovoltaics: Diurnal analysis, dependence on temperature, irradiance, and degradation. Journal of Renewable and Sustainable Energy, 7 (1). DOI: 10.1063/1.4906915

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Abstract

The outdoor dependence of temperature and diurnal irradiance on inverted organic photovoltaic (OPV) module performance has been analysed and benchmarked against monocrystalline-silicon (c-Si) photovoltaic technology. This is first such report and it is observed that OPVs exhibit poorer performance under low light conditions, such as overcast days, as a result of inflexion behaviour in the current-voltage curves, which limits the open-circuit voltage (VOC) and fill factor. These characteristics can be removed by photo-annealing at higher irradiance levels, which occur diurnally as irradiance increases after sunrise. We also report the first temperature coefficients for OPVs from outdoor data; the OPV modules showed a positive temperature coefficient, which compared to a negative coefficient from the c-Si modules. Overall, the cell degradation outdoors appears very severe for these modules and highlights the need for improved barrier.

Item Type: Article
Subjects: Research Publications
Departments: College of Physical and Applied Sciences > School of Electronic Engineering
Date Deposited: 30 Jul 2015 02:28
Last Modified: 23 Sep 2015 02:50
ISSN: 1941-7012
URI: http://e.bangor.ac.uk/id/eprint/4918
Identification Number: DOI: 10.1063/1.4906915
Publisher: AIP Publishing
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