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FACULTY OF PHYSICS

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2024-11-23 18:13

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Conference: Bucharest University Faculty of Physics 2023 Meeting

Section: Solid State Physics and Materials Science, Optics, Spectroscopy, Plasma and Lasers

Title:

Capacitive and inductive effects in perovskite solar cells

Authors:

Nicolae FILIPOIU(1,2), Amanda Teodora PREDA(1,2), Dragos-Victor ANGHEL(1,2), Roxana PATRU(3), Rachel Elizabeth BROPHY(4), Movaffaq KATEB(4), C. BESLEAGA(3), Andrei Gabriel Tomulescu(3), Ioana PINTILIE(3), Andrei MANOLESCU(4), George Alexandru NEMNES(1,2)

^*
Affiliation:

1) University of Bucharest, Faculty of Physics, Magurele-Ilfov 077125, Romania

2) Horia Hulubei National Institute for Physics and Nuclear Engineering, Magurele-Ilfov 077126, Romania

3) National Institute of Materials Physics, Magurele, Ilfov 077125, Romania

4) Department of Engineering, Reykjavik University, Menntavegur 1, Reykjavik IS-102, Iceland

E-mail

nemnes@solid.fizica.unibuc.ro

Keywords:

Abstract:

The perovskite solar cells (PSCs) witnessed an impressive development in terms of power conversion efficiencies, reaching 25.7%, becoming one of most rapidly advancing technologies. However, one 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 (large signal analysis) and also in the huge apparent capacitive and inductive effects (small-signal analysis / impedance spectroscopy). We introduce an equivalent circuit, which consistently explains the features in the dynamic J-V characteristics [1], like the normal and inverted hysteresis, as well as the peculiar capacitive and inductive effects visible in the impedance spectroscopy. Our model is based on the key assumption that the recombination current is ion-modulated. 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 backed 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. In addition, we provide a comprehensive overview on the hysteretic phenomena in perovskite solar cells and the importance of proper measurement protocols [2,3].

References:

[1] 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, "Capacitive and Inductive Effects in Perovskite Solar Cells: The Different Roles of Ionic Current and Ionic Charge Accumulation", Phys. Rev. Applied 18, 064087 (2022)

[2] G. A. Nemnes, Cristina Besleaga, Viorica Stancu, Daniela Emilia Dogaru, Lucia Nicoleta Leonat, L. Pintilie, K. Torfason, M. Ilkov, A. Manolescu, Ioana Pintilie, "Normal and inverted hysteresis in perovskite solar cells", J. Phys. Chem. C 121, 11207 (2017)

[3] G. A. Nemnes, Cristina Besleaga, A. G. Tomulescu, Alexandra Palici, L. Pintilie, A. Manolescu and Ioana Pintilie, "How measurement protocols influence the dynamic J-V characteristics of perovskite solar cells: theory and experiment", Solar Energy 173, 976 (2018)

Acknowledgement:

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) and from the mobility EEA project 21-MOB-0014.