Influence of bromide content on iodide migration in inverted MAPb(I1-: XBrx)3 perovskite solar cells

Rodrigo García-Rodríguez; Dominic Ferdani; Samuel Pering; Peter J. Baker; Petra J. Cameron

doi:10.1039/c9ta08848b

Influence of bromide content on iodide migration in inverted MAPb(I_{1-: X}Br_x)₃ perovskite solar cells

Rodrigo García-Rodríguez, Dominic Ferdani, Samuel Pering, Peter J. Baker, Petra J. Cameron

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The effect of a systematic increase in the bromide content on mixed anion methyl ammonium lead halide, MAPb(I_1-xBr_x)₃, perovskite solar cells is investigated. We show that at a critical bromide concentration (7.5%) we supress the slow impedance response from the cells. We link the changing impedance spectrum to a large increase in the activation energy for iodide motion. These results are corroborated by muon spin relaxation measurements, where we show that at the concentration of bromide typically used in high performance perovskite solar cells (17%) there is no sign of iodide motion in powders. Finally, we show JV curve hysteresis as a function of bromide content. The scan rate at which the maximum hysteresis index is observed does not change as the % Br is increased, leading us to conclude that the low frequency impedance response and the JV curve hysteresis are not caused by the same mobile ions.

Original language	English
Pages (from-to)	22604-22614
Number of pages	11
Journal	Journal of Materials Chemistry A
Volume	7
Issue number	39
Early online date	20 Sep 2019
DOIs	https://doi.org/10.1039/c9ta08848b
Publication status	Published - 21 Oct 2019

ASJC Scopus subject areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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title = "Influence of bromide content on iodide migration in inverted MAPb(I1-: XBrx)3 perovskite solar cells",

abstract = "The effect of a systematic increase in the bromide content on mixed anion methyl ammonium lead halide, MAPb(I1-xBrx)3, perovskite solar cells is investigated. We show that at a critical bromide concentration (7.5%) we supress the slow impedance response from the cells. We link the changing impedance spectrum to a large increase in the activation energy for iodide motion. These results are corroborated by muon spin relaxation measurements, where we show that at the concentration of bromide typically used in high performance perovskite solar cells (17%) there is no sign of iodide motion in powders. Finally, we show JV curve hysteresis as a function of bromide content. The scan rate at which the maximum hysteresis index is observed does not change as the % Br is increased, leading us to conclude that the low frequency impedance response and the JV curve hysteresis are not caused by the same mobile ions.",

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T1 - Influence of bromide content on iodide migration in inverted MAPb(I1-: XBrx)3 perovskite solar cells

AU - García-Rodríguez, Rodrigo

AU - Ferdani, Dominic

AU - Pering, Samuel

AU - Baker, Peter J.

AU - Cameron, Petra J.

PY - 2019/10/21

Y1 - 2019/10/21

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AB - The effect of a systematic increase in the bromide content on mixed anion methyl ammonium lead halide, MAPb(I1-xBrx)3, perovskite solar cells is investigated. We show that at a critical bromide concentration (7.5%) we supress the slow impedance response from the cells. We link the changing impedance spectrum to a large increase in the activation energy for iodide motion. These results are corroborated by muon spin relaxation measurements, where we show that at the concentration of bromide typically used in high performance perovskite solar cells (17%) there is no sign of iodide motion in powders. Finally, we show JV curve hysteresis as a function of bromide content. The scan rate at which the maximum hysteresis index is observed does not change as the % Br is increased, leading us to conclude that the low frequency impedance response and the JV curve hysteresis are not caused by the same mobile ions.

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