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Proceedings Paper

Characterization of organic and perovskite solar cells by impedance spectroscopy
Author(s): Beatriz Romero; Gonzalo del Pozo; Belén Arredondo; Diego Martín-Martín; Enrique Hernández-Balaguera; María del Carmen López González
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Paper Abstract

Impedance Spectroscopy (IS) is a non-destructive characterization technique that has been extensively applied to different electronic devices, such as LEDs, photodiodes and solar cells. This technique provides access to valuable information about dynamical mechanisms (minority carrier recombination, diffusion, etc.) taking place in the different layers of the device. Besides, material and device parameters, such as dielectric constant, built-in potential, and carrier mobilities can be extracted. Impedance spectra results from applying a small AC signal over a steady DC bias and measuring the resulting small AC current over a frequency range, typically from 1 Hz to 1 MHz, 𝑍(jω) = VAC/1AC. The Nyquist plot of the complex impedance (imaginary part vs real part) generally presents one or more features (mainly semicircles), depending on the number of mechanisms governing the device. Fitting an electrical equivalent circuit to the complete impedance spectra provides parameters related to each feature (resistance and capacitance). In this work, IS has been used to characterize organic and perovskite solar cells (OSCs and PSCs, respectively). Measurements have been performed in dark and under illumination conditions at different bias (from 0 V to VOC). A simple circuital model containing two resistances and two capacitances has been used to fit the measured IS spectra. The interpretation of extracted circuital parameters and its relationship with the physical model of the device will be discussed.

Paper Details

Date Published: 30 August 2019
PDF: 10 pages
Proc. SPIE 11095, Women in Renewable Energy (WiRE), 110950N (30 August 2019); doi: 10.1117/12.2530568
Show Author Affiliations
Beatriz Romero, Univ. Rey Juan Carlos (Spain)
Gonzalo del Pozo, Univ. Rey Juan Carlos (Spain)
Belén Arredondo, Univ. Rey Juan Carlos (Spain)
Diego Martín-Martín, Univ. Rey Juan Carlos (Spain)
Enrique Hernández-Balaguera, Univ. Rey Juan Carlos (Spain)
María del Carmen López González, Univ. Rey Juan Carlos (Spain)

Published in SPIE Proceedings Vol. 11095:
Women in Renewable Energy (WiRE)
Monica Lira-Cantu; Zakya H. Kafafi, Editor(s)

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