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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 23:04 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Solid State Physics and Materials Science
Title:
How measurement protocols influence the dynamic J-V characteristics of perovskite solar cells: theory and experiment
Authors:
George Alexandru NEMNES (1), Cristina BESLEAGA (2), Andrei Gabriel TOMULESCU (1,2), Alexandra PALICI (2), Lucian PINTILIE (2), Andrei MANOLESCU (3), Ioana PINTILIE (2)
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Affiliation:
1) University of Bucharest, Faculty of Physics, MDEO Research Center, 077125 Magurele-Ilfov, Romania
2) National Institute of Materials Physics, Magurele 077125, Ilfov, Romania
3) School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland
E-mail
nemnes@solid.fizica.unibuc.ro
Keywords:
perovskite solr cell; measurement protocol; dynamic J-V hysteresis.
Abstract:
The dynamic effects observed in the J-V measurements represent one important hallmark in the behavior of the perovskite solar cells [1,2]. Proper measurement protocols (MPs) should be employed for the experimental data reproducibility, in particular for a reliable evaluation of the power conversion efficiency (PCE), as well as for a meaningful characterization of the type and magnitude of the hysteresis. We discuss here several MPs by comparing the experimental J-V characteristics with simulated ones using the dynamic electrical model (DEM) [3]. Pre-poling conditions and bias scan rate can have a dramatic influence not only on the apparent solar cell performance, but also on the hysteretic phenomena. Under certain measurement conditions, a hysteresis-less behavior with relatively high PCEs may be observed, although the J-V characteristics may be far away from the stationary case. Furthermore, forward-reverse and reverse-forward bias scans show qualitatively different behaviors regarding the type of the hysteresis, normal and inverted, depending on the bias pre-poling. We emphasize here that correlated forward-reverse or reverse-forward bias scans are essential for a correct assessment of the dynamic hysteresis [3]. In this context, we define a hysteresis index which consistently assigns the hysteresis type and magnitude. Our DEM simulations, supported by experimental data [4], provide further guidance for an efficient and accurate determination of the stationary J-V characteristics, showing that the type and magnitude of the dynamic hysteresis may be affected by unintentional pre-conditioning in typical experiments.
References:
[1] G.A. Nemnes et al., J. Phys. Chem. C 121, 11207 (2017).
[2] G.A. Nemnes et al., Sol. Energy Mater. Sol. Cells 159, 197 (2017).
[3] G.A. Nemnes et al., arXiv:1803.00285 (2018).
[4] C. Besleaga et al., J. Phys. Chem. Lett. 7, 5168 (2016).
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