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Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis

Title: Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis
Authors: Calado, P
Telford, AM
Bryant, D
Li, X
Nelson, J
Barnes, PRF
Item Type: Journal Article
Abstract: Ionic migration has been proposed as a possible cause of photovoltaic current-voltage hysteresis in hybrid perovskite solar cells. A major objection to this hypothesis is that hysteresis can be reduced by changing the interfacial contact materials; this is unlikely to significantly influence the behaviour of mobile ionic charge within the perovskite phase. Here we show that the primary effects of ionic migration can in fact be observed regardless of whether the contacts were changed to give devices with or without significant hysteresis. Transient optoelectronic measurements combined with device simulations indicate that electric-field screening, consistent with ionic migration, is similar in both high and low hysteresis CH3NH3PbI3 cells. Simulation of the photovoltage and photocurrent transients shows that hysteresis requires the combination of both mobile ionic charge and recombination near the perovskite-contact interfaces. Passivating contact recombination results in higher photogenerated charge concentrations at forward bias which screen the ionic charge, reducing hysteresis.
Issue Date: 22-Dec-2016
Date of Acceptance: 22-Sep-2016
URI: http://hdl.handle.net/10044/1/42390
DOI: https://dx.doi.org/10.1038/ncomms13831
ISSN: 2041-1723
Publisher: Nature Publishing Group: Nature Communications
Journal / Book Title: Nature Communications
Volume: 7
Copyright Statement: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ © The Author(s) 2016
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/J002305/1
EP/M025020/1
J13564
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
ORGANOMETAL TRIHALIDE PEROVSKITE
METHYLAMMONIUM LEAD IODIDE
ANOMALOUS HYSTERESIS
V HYSTERESIS
PERFORMANCE
EFFICIENCY
STABILITY
TRANSPORT
CRYSTAL
LAYER
cond-mat.mtrl-sci
MD Multidisciplinary
Publication Status: Published
Article Number: 13831
Appears in Collections:Physics
Chemistry
Experimental Solid State
Centre for Environmental Policy