Friesen, Gabi and özsar, M.E. and Dunlop, Ewan D.
(2000)
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Impedance model for CdTe solar cells exhibiting constant phase element behaviour.
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*Thin Solid Films*, 361.

## Abstract

Different equivalent circuit models were used to fit the impedance spectra of CdTe solar cells at fixed d.c.-voltages and the resulting C-V (capacitance-voltage)-curves and C-f (capacitance-frequency)-curves were analyzed. A simplified equivalent circuit model, which consists of a parallel resistor R p and capacitor C in series with a resistor R s , does not give a good fit to the experimental data and is not capable of simulating the dispersive trend. Also the commonly assumed model for CdTe, which consist of two sub-circuits (R p and C) does not allow the simulation of the measured impedance spectra. As both models are only consisting of frequency-independent circuit elements they can not be used to describe the frequency dispersion of thin film CdTe solar cells. A phenomenological description of the capacitance behaviour was obtained by replacing the capacitor of the first model by a frequency-dependent non-ideal capacitor, a so-called constant phase element (CPE). This element is described by the two CPE-parameters (T and P). A correlation of these parameters to the capacitance dispersion and to the real cell capacitance are presented and the physical phenomena responsible for the capacitance dispersion are discussed.

Item Type: | Scientific journal article, Newspaper article or Magazine article |
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Subjects: | Engineering > Electronic & electrical engineering > Electrical power > Electrical power generation |

Department/unit: | Dipartimento ambiente costruzioni e design > Istituto sostenibilità applicata all'ambiente costruito |

Depositing User: | Gabi Friesen |

Date Deposited: | 27 Aug 2018 05:58 |

Last Modified: | 27 Aug 2018 05:58 |

URI: | http://repository.supsi.ch/id/eprint/9710 |

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