Ionic transport in hybrid lead iodide perovskite solar cells
File(s)
Author(s)
Type
Journal Article
Abstract
Solar cells based on organic–inorganic halide perovskites have recently shown rapidly rising power conversion efficiencies, but exhibit unusual behaviour such as current–voltage hysteresis and a low-frequency giant dielectric response. Ionic transport has been suggested to be an important factor contributing to these effects; however, the chemical origin of this transport and the mobile species are unclear. Here, the activation energies for ionic migration in methylammonium lead iodide (CH3NH3PbI3) are derived from first principles, and are compared with kinetic data extracted from the current–voltage response of a perovskite-based solar cell. We identify the microscopic transport mechanisms, and find facile vacancy-assisted migration of iodide ions with an activation energy of 0.6 eV, in good agreement with the kinetic measurements. The results of this combined computational and experimental study suggest that hybrid halide perovskites are mixed ionic–electronic conductors, a finding that has major implications for solar cell device architectures.
Date Issued
2015-06-24
Date Acceptance
2015-05-14
Citation
Nature Communications, 2015, 6 (7)
ISSN
2041-1723
Publisher
Nature Research
Journal / Book Title
Nature Communications
Volume
6
Issue
7
Copyright Statement
© 2015 The Authors. 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
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
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000357178300002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
EP/J002305/1
Subjects
Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
HALIDE PEROVSKITES
HIGH-PERFORMANCE
HYSTERESIS
MECHANISM
ELECTRON
CONDUCTION
SEPARATION
CH3NH3PBI3
DIFFUSION
INSIGHTS
Publication Status
Published
Article Number
ARTN 7497