Characterization and modeling of organic (P3HT:PCBM) solar cells as a function of bias and illumination

We investigated the response of roll coated organic solar cells at different bias voltages and illumination levels to implement a detailed impedance model. The technique used for the investigation is based on the combination of standard DC characterization with the impedance spectroscopy at differen...

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Bibliographic Details
Published in:	Solar energy materials and solar cells Vol. 157; pp. 337 - 345
Main Authors:	Rizzo, Antonio, Cester, Andrea, Wrachien, Nicola, Lago, Nicolò, Torto, Lorenzo, Barbato, Marco, Favaro, Jonny, Gevorgyan, Suren A., Corazza, Michael, Krebs, Frederik C.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-12-2016
Subjects:	AC model Diffusion and recombination Electrical model Impedance spectroscopy Organic photovoltaic heterojunction solar cell UV degradation Diffusion and recombination Impedance spectroscopy Organic photovoltaic heterojunction solar cell Electrical model UV degradation AC model
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Summary:	We investigated the response of roll coated organic solar cells at different bias voltages and illumination levels to implement a detailed impedance model. The technique used for the investigation is based on the combination of standard DC characterization with the impedance spectroscopy at different bias and illumination intensity conditions. We analyzed both fresh and intentionally degraded cells. The impedance spectra show different peaks evolutions, depending on the degradation of the cells. Moreover, the same trend appears by measuring the cell at different illumination levels. To describe the cell impedance behaviors we suggest an electrical model based on distributed elements. By fitting the model to experimental data, we extrapolate the parameters related to electron transport, recombination and accumulation. The main differences between fresh and degraded samples are underlined. •We develop a complete AC model representing organic heterojunction solar cells.•We validate the model on a wide range of bias voltages and illumination levels.•We extrapolate and compare model parameters on fresh and intentionally degraded cells.•We highlight the behavior of model parameters as a function of both light and voltage bias.•We estimate physical parameters of diffusion and recombination on both fresh and degraded cells.
ISSN:	0927-0248 1879-3398
DOI:	10.1016/j.solmat.2016.06.001