Partial cation substitution reduces iodide ion transport in lead iodide perovskite solar cells

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Halide perovskite solar cells containing a mixture of A-site cations are attracting considerable interest due to their improved stability and high power conversion efficiencies. Ionic transport is known to be an important predictor of perovskite behaviour, but the impact of partial A-site substitution on iodide ion diffusion is poorly understood. Here, we combine ab initio modelling, impedance spectroscopy and muon spin relaxation to investigate the effect on iodide ion transport of incorporating a low concentration of each of seven different sized cations (from small rubidium to large guanidinium) into methylammonium lead iodide. Experimental and simulation results are in good agreement, indicating that these cation substitutions increase the activation energy for iodide ion diffusion. We show for the first time that partial guanidinium substitution into methylammonium lead iodide strongly suppresses iodide ion transport. The insights gained from this multi-technique study are important for the future design of mixed-cation perovskite solar cells with enhanced performance.
Original languageEnglish
Pages (from-to)2264-2272
Number of pages9
JournalEnergy & Environmental Science
Volume12
Issue number7
DOIs
Publication statusPublished - 15 May 2019

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

@article{60144589c6b446edb349d173ab3c66b7,
title = "Partial cation substitution reduces iodide ion transport in lead iodide perovskite solar cells",
abstract = "Halide perovskite solar cells containing a mixture of A-site cations are attracting considerable interest due to their improved stability and high power conversion efficiencies. Ionic transport is known to be an important predictor of perovskite behaviour, but the impact of partial A-site substitution on iodide ion diffusion is poorly understood. Here, we combine ab initio modelling, impedance spectroscopy and muon spin relaxation to investigate the effect on iodide ion transport of incorporating a low concentration of each of seven different sized cations (from small rubidium to large guanidinium) into methylammonium lead iodide. Experimental and simulation results are in good agreement, indicating that these cation substitutions increase the activation energy for iodide ion diffusion. We show for the first time that partial guanidinium substitution into methylammonium lead iodide strongly suppresses iodide ion transport. The insights gained from this multi-technique study are important for the future design of mixed-cation perovskite solar cells with enhanced performance.",
author = "Dominic Ferdani and Samuel Pering and Dibyajyoti Ghosh and Peter Kubiak and Alison Walker and Simon Lewis and Andrew Johnson and Peter Baker and Muhammed Islam and Petra Cameron",
year = "2019",
month = "5",
day = "15",
doi = "10.1039/C9EE00476A",
language = "English",
volume = "12",
pages = "2264--2272",
journal = "Energy & Environmental Science",
issn = "1754-5692",
publisher = "Royal Society of Chemistry",
number = "7",

}

TY - JOUR

T1 - Partial cation substitution reduces iodide ion transport in lead iodide perovskite solar cells

AU - Ferdani, Dominic

AU - Pering, Samuel

AU - Ghosh, Dibyajyoti

AU - Kubiak, Peter

AU - Walker, Alison

AU - Lewis, Simon

AU - Johnson, Andrew

AU - Baker, Peter

AU - Islam, Muhammed

AU - Cameron, Petra

PY - 2019/5/15

Y1 - 2019/5/15

N2 - Halide perovskite solar cells containing a mixture of A-site cations are attracting considerable interest due to their improved stability and high power conversion efficiencies. Ionic transport is known to be an important predictor of perovskite behaviour, but the impact of partial A-site substitution on iodide ion diffusion is poorly understood. Here, we combine ab initio modelling, impedance spectroscopy and muon spin relaxation to investigate the effect on iodide ion transport of incorporating a low concentration of each of seven different sized cations (from small rubidium to large guanidinium) into methylammonium lead iodide. Experimental and simulation results are in good agreement, indicating that these cation substitutions increase the activation energy for iodide ion diffusion. We show for the first time that partial guanidinium substitution into methylammonium lead iodide strongly suppresses iodide ion transport. The insights gained from this multi-technique study are important for the future design of mixed-cation perovskite solar cells with enhanced performance.

AB - Halide perovskite solar cells containing a mixture of A-site cations are attracting considerable interest due to their improved stability and high power conversion efficiencies. Ionic transport is known to be an important predictor of perovskite behaviour, but the impact of partial A-site substitution on iodide ion diffusion is poorly understood. Here, we combine ab initio modelling, impedance spectroscopy and muon spin relaxation to investigate the effect on iodide ion transport of incorporating a low concentration of each of seven different sized cations (from small rubidium to large guanidinium) into methylammonium lead iodide. Experimental and simulation results are in good agreement, indicating that these cation substitutions increase the activation energy for iodide ion diffusion. We show for the first time that partial guanidinium substitution into methylammonium lead iodide strongly suppresses iodide ion transport. The insights gained from this multi-technique study are important for the future design of mixed-cation perovskite solar cells with enhanced performance.

UR - http://www.scopus.com/inward/record.url?scp=85069039532&partnerID=8YFLogxK

U2 - 10.1039/C9EE00476A

DO - 10.1039/C9EE00476A

M3 - Article

VL - 12

SP - 2264

EP - 2272

JO - Energy & Environmental Science

JF - Energy & Environmental Science

SN - 1754-5692

IS - 7

ER -