Presentation Details
| Characterization of Ionic-electronic Transport and Recombination in Perovskite Solar Cells using Impedance Spectroscopy and Drift-diffusion Simulations under Multi-biasing Conditions Juan Pablo Medina Flechas1, 2, Raj Dashrath Patel2, Osbel Almora3, Dounya Barrit1, 2, Marion Provost2, Sylvain Le Gall2, 5, Jean-Paul Kleider2, 4, 5, Camille Bainier1, 2, Pilar Lopez-Varo2, Philip Schulz2, 4, 6. 1TotalEnergies OneTech, Palaiseau, France.2Institut Photovoltaïque d'Ile-de-France (IPVF), Palaiseau, France.3Universitat Rovira i Virgili, Tarragona, Spain.4Centre National de la Recherche Scientifique (CNRS), Palaiseau, France.5Laboratoire de Génie Electrique et Electronique de Paris (GeePs), Gif-sur-Yvette, France.6Ecole Polytechnique, Palaiseau, France |
Abstract
Perovskite solar cells (PSCs) are among the most promising photovoltaic technologies, offering high efficiencies and low fabrication costs. However, their commercialization remains limited by stability issues and incomplete understanding of the intrinsic mechanisms governing device performance. Particularly, slow mobile-ion dynamics can modulate charge recombination and extraction, strongly affecting PSCs operation. Here, we use impedance spectroscopy (IS) as an advanced characterization technique to investigate the underlying processes that govern the current-voltage (J-V) response of PSCs [1]. To this end we combine J-V, SunsVoc and IS measurements for a comprehensive analysis of inverted PSC architectures. From the analysis of experimental IS fits, using equivalent electric circuit models along with drift-diffusion simulations for enhanced physical interpretation [2], we extract multiple resistive and capacitive contributions under different voltage bias and illumination conditions. At short-circuit, we show with our characterization methodology that key properties in the perovskite (PK) layer can be retrieved such as electron-hole mobility and ion concentration. Under open-circuit conditions, we further evaluate the coupled effects of ionic motion and energy band offsets at the PK interfaces with the charge transport layers (CTLs), on dominant recombination mechanisms. We also compare the ideality factor (nid) derived from across the three characterization techniques, using a single-diode model. In this work, we apply our methodology to evaluate the differences in electronic-ionic response for selected PSCs varying PK composition and the use of passivation treatments at each of the PK/CTLs interfaces. [1] O. Almora, P. López-Varo, R. J.A. Anta, et al. “Instability analysis of perovskite solar cells via short-circuit impedance spectroscopy: A case study on NiOx passivation,” J. Appl. Phys. 136(9), 094502 (2024). [2] P. Calado, J. Nelson, P.R.F. Barnes, et al. “Driftfusion: an open source code for simulating ordered semiconductor devices with mixed ionic-electronic conducting materials in one dimension,” J. Comput. Electron. 21(4), 960–991 (2022).
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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