Study of impedance spectra parameters of PCDTBT:PC70BM solar cells as a function of the deposition solution concentration

In this contribution, we apply impedance spectroscopy (IS) to study a series of bulk-heterojunction PCDTBT:PC70BM solar cells deposited by spin-coating from dichlorobenzene solution of different concentrations. The samples are deposited on ITO covered glass and have the structure PEDOT:PSS / PCDTBT:...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-03, Vol.992 (1), p.12045
Main Authors: Sendova-Vassileva, M, Popkirov, G, Gergova, R, Grancharov, G, Gancheva, V
Format: Article
Language:English
Subjects:
Bias
Deposition
Equivalent circuits
Heterojunctions
Magnetron sputtering
Parameters
Photovoltaic cells
Physics
Short circuits
Solar cells
Spectra
Spectrum analysis
Spin coating
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Summary:In this contribution, we apply impedance spectroscopy (IS) to study a series of bulk-heterojunction PCDTBT:PC70BM solar cells deposited by spin-coating from dichlorobenzene solution of different concentrations. The samples are deposited on ITO covered glass and have the structure PEDOT:PSS / PCDTBT:PC70BM / Me where Me is Ag or Al deposited by either magnetron sputtering or thermal evaporation. The impedance spectra are measured upon one sun illumination at short-circuit conditions as a function of the concentration of the solution used for the deposition of the active layer. For one of the samples, measurements are made as a function of the applied bias as well. The measured spectra are fitted using an equivalent circuit. The dependences of the parameters derived from the fits on the concentration of the solution and on the bias voltage are presented and discussed in correlation with the quality of the solar cells.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/992/1/012045