Title: Why perovskite solar cells with high efficiency show small IV-curve hysteresis
Authors : Neukom, Martin
Züfle, Simon
Knapp, Evelyne
Makha, Mohammed
Hany, Roland
Ruhstaller, Beat
Published in : Solar Energy Materials and Solar Cells
Volume(Issue) : 169
Pages : 159
Pages to: 166
Publisher / Ed. Institution : Elsevier
Issue Date: 2017
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subject (DDC) : 621.3: Electrical engineering and electronics
Abstract: There is increasing evidence that the presence of mobile ions in perovskite solar cells can cause a current-voltage curve hysteresis. However, it is still subject of ongoing debates how exactly mobile ions influence the device operation. We use drift-diffusion simulations incorporating mobile ions to describe IV-curves of preconditioned methylammonium lead iodide perovskite solar cells and compare them with experimental results. Our simulation results show that the hysteresis depends on the extent of surface recombination and on the diffusion length of charge carriers. We provide a detailed explanation for the reduced hysteresis of perovskite solar cells with high power conversion efficiencies. We find that in high-efficiency solar cells ion migration is still present, but does not cause a hysteresis effect. In these devices charge extraction is mainly driven by diffusion of free electrons and holes.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific Journal
DOI : 10.1016/j.solmat.2017.05.021
ISSN: 0927-0248
URI: https://digitalcollection.zhaw.ch/handle/11475/2766
Appears in Collections:Publikationen School of Engineering

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