Capacitive and inductive effects in perovskite solar cells

George Alexandru Nemnes^a^,^b^,^c, Nicolae Filipoiu^a^,^b, Amanda Teodora Preda^a^,^b^,^c, Dragos Victor Anghel^a^,^b^,^c, Roxana Patru^d, Rachel Elizabeth Brophy^e, Movaffaq Kateb^e, Cristina Besleaga^d, Andrei Gabriel Tomulescu^d, Ioana Pintilie^d, Andrei Manolescu^e

^aUniversity of Bucharest, Faculty of Physics, Magurele-Ilfov 077125, Romania

^bHoria Hulubei National Institute for Physics and Nuclear Engineering, Magurele-Ilfov 077126, Romania

^cResearch Institute of the University of Bucharest (ICUB), Mihail Kogalniceanu Blvd 36-46, Bucharest 050107,Romania

^dNational Institute of Materials Physics, Magurele, Ilfov 077125, Romania

^eDepartment of Engineering, Reykjavik University, Menntavegur 1, Reykjavik IS-102, Iceland

Proceedings of Device Physics Characterization and Interpretation in Perovskite and Organic Materials (DEPERO)

VALÈNCIA, Spain, 2023 October 3rd - 5th

Organizers: Sandheep Ravishankar, Juan Bisquert and Evelyne Knapp

Invited Speaker, George Alexandru Nemnes, presentation 012
DOI: https://doi.org/10.29363/nanoge.DEPERO.2023.012
Publication date: 14th September 2023

In spite of the impressive development in terms of power conversion efficiencies, presently at 26.1%, one of the most problematic issue which still hinders the commercialization concerns the stability of the PSCs. Of critical importance is the detection and mitigation of ion migration, which is evidenced in the hysteretic effects and also in the huge apparent capacitive and inductive effects.

We introduce an equivalent circuit [1], which consistently explains the features in the dynamic J-V characteristics, like the normal and inverted hysteresis, the current bump in the reverse scan following a positive voltage pre-poling, as well as the peculiar capacitive and inductive effects visible in the impedance spectroscopy. Our model is based on the key assumption of ion-modulated recombination current. Here, we discuss the different roles of ionic charge accumulation and ionic charge current in reproducing capacitive and inductive effects, in close connection with the physical processes leading to photo-generated carrier recombination. The simulations are supported by experimental impedance spectroscopy data. Our approach also outlines a possible investigation route of ion migration, which aims to a more robust design of the PSCs.

[1] “Capacitive and Inductive Effects in Perovskite Solar Cells: The Different Roles of Ionic Current and Ionic Charge Accumulation”, N. Filipoiu, A.T. Preda, D.V. Anghel, R. Patru, R.E. Brophy, M. Kateb, C. Besleaga, A.G. Tomulescu, I. Pintilie, A. Manolescu, and G.A. Nemnes, Phys. Rev. Appl. 18, 064087 (2022).

Acknowledgements:

The research leading to these results has received funding from the EEA Grants 2014-2021, under Project Contract No. 36/2021 (Project Code: EEA-RO-NO-2018-0106).

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