Light intensity modulated impedance spectroscopy (LIMIS) in all-solid-state solar cells at open-circuit

Almora O, Zhao Y, Du X, Heumüller T, Matt G, Garcia-Belmonte G, Brabec C (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 75

Article Number: 104982

DOI: 10.1016/j.nanoen.2020.104982

Abstract

Potentiostatic impedance spectroscopy (IS) is a well-established characterization technique for elucidating the electric resistivity and capacitive features of materials and devices. For solar cells, by applying a small voltage perturbation the current signal is recorded and the recombination processes and defect distributions can be accessed. In this work, a photo-impedance approach, named “light intensity modulated impedance spectroscopy” (LIMIS), is first time tested in all-solid-state photovoltaics by individually recording photocurrent (IMPS) and photovoltage (IMVS) responsivity signals due to a small light perturbation at open-circuit (OC), and combining them: LIMIS = IMVS/IMPS. The experimental LIMIS spectra from silicon, organic, and perovskite solar cells are presented and compared with IS. Our theoretical analyses, including equivalent circuit models, show a correction to the lifetimes values by obtaining the total differential resistances and capacitances combining IS and LIMIS. This correction addresses some discrepancies among different techniques, as also shown with photo-induced transient photovoltage. The experimental differences between IS and LIMIS proves the unsuitability of the superposition principle and suggest a bias-dependent photo-current correction to the empirical Shockley equation of the steady-state current at different illumination intensities around OC. In addition, new features are reported for the low-frequency capacitance of perovskite solar cells.

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Involved external institutions

Universitat Jaume I (UJI) Spain (ES)

How to cite

APA:

Almora, O., Zhao, Y., Du, X., Heumüller, T., Matt, G., Garcia-Belmonte, G., & Brabec, C. (2020). Light intensity modulated impedance spectroscopy (LIMIS) in all-solid-state solar cells at open-circuit. Nano Energy, 75. https://dx.doi.org/10.1016/j.nanoen.2020.104982

MLA:

Almora, Osbel, et al. "Light intensity modulated impedance spectroscopy (LIMIS) in all-solid-state solar cells at open-circuit." Nano Energy 75 (2020).

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