Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites

Ilia Pavlovetc; Michael Brennan; Sergiu Draguta; Anthony Ruth; Taylor Moot; Jeffrey Christians; Kyle Aleshire; Steve Harvey; Stefano Toso; Sanjini Nanayakkara; Jonah Messinger; Joseph Luther; Masaru Juno

doi:10.1021/acsenergylett.0c01207

Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites

Ilia Pavlovetc, Michael Brennan, Sergiu Draguta, Anthony Ruth, Taylor Moot, Jeffrey Christians, Kyle Aleshire, Steve Harvey, Stefano Toso, Sanjini Nanayakkara, Jonah Messinger, Joseph Luther, Masaru Juno

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

65 Scopus Citations

Abstract

Ion migration represents an intrinsic instability of metal halide perovskite solar cells. Here we show that triple-cation FAxMAyCs1-x-yPbI3 [FA+ = (NH2)2CH+, MA+ = CH3NH3+] active layers with mixed orthorhombic, post-perovskite (δortho-CsPbI3), and cubic perovskite (α) phases (i.e., α/δ-phase FAxMAyCs1-x-yPbI3) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA0.85Cs0.15PbI3 and FA0.76MA0.15Cs0.09PbI3). Infrared photothermal heterodyne imaging and time-of-flight secondary ion mass spectrometry are used to visualize exclusive α-phase perovskite lateral device A+ cation accumulation (depletion) at perovskite negative (positive) electrode interfaces. The resulting compositional heterogeneities lead to degradation. Operational stability testing of solar cells reveals similar degradation behavior; α/δ-phase FAxMAyCs1-x-yPbI3 lateral devices/solar cells, by contrast, show improved stabilities. Enhanced α/δ-FAxMAyCs1-x-yPbI3 stability is rationalized by δortho-phase inclusions, acting as barriers through which A+ cations do not easily migrate. This study thus provides new insights into cation migration in FAxMAyCs1-x-yPbI3 perovskites and suggests a materials design strategy toward suppressing cation instabilities in hybrid perovskites.

Original language	American English
Pages (from-to)	2802-2810
Number of pages	9
Journal	ACS Energy Letters
Volume	5
Issue number	9
DOIs	https://doi.org/10.1021/acsenergylett.0c01207 https://doi.org/10.1021/acsenergylett.0c01207
State	Published - 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

NREL Publication Number

NREL/JA-5900-76887

Keywords

cation migration
perovskites

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Pavlovetc, I., Brennan, M., Draguta, S., Ruth, A., Moot, T., Christians, J., Aleshire, K., Harvey, S., Toso, S., Nanayakkara, S., Messinger, J., Luther, J., & Juno, M. (2020). Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites. ACS Energy Letters, 5(9), 2802-2810. https://doi.org/10.1021/acsenergylett.0c01207, https://doi.org/10.1021/acsenergylett.0c01207

@article{99e9f1f8af124fe8b7235114f40d0701,

title = "Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites",

abstract = "Ion migration represents an intrinsic instability of metal halide perovskite solar cells. Here we show that triple-cation FAxMAyCs1-x-yPbI3 [FA+ = (NH2)2CH+, MA+ = CH3NH3+] active layers with mixed orthorhombic, post-perovskite (δortho-CsPbI3), and cubic perovskite (α) phases (i.e., α/δ-phase FAxMAyCs1-x-yPbI3) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA0.85Cs0.15PbI3 and FA0.76MA0.15Cs0.09PbI3). Infrared photothermal heterodyne imaging and time-of-flight secondary ion mass spectrometry are used to visualize exclusive α-phase perovskite lateral device A+ cation accumulation (depletion) at perovskite negative (positive) electrode interfaces. The resulting compositional heterogeneities lead to degradation. Operational stability testing of solar cells reveals similar degradation behavior; α/δ-phase FAxMAyCs1-x-yPbI3 lateral devices/solar cells, by contrast, show improved stabilities. Enhanced α/δ-FAxMAyCs1-x-yPbI3 stability is rationalized by δortho-phase inclusions, acting as barriers through which A+ cations do not easily migrate. This study thus provides new insights into cation migration in FAxMAyCs1-x-yPbI3 perovskites and suggests a materials design strategy toward suppressing cation instabilities in hybrid perovskites.",

keywords = "cation migration, perovskites",

author = "Ilia Pavlovetc and Michael Brennan and Sergiu Draguta and Anthony Ruth and Taylor Moot and Jeffrey Christians and Kyle Aleshire and Steve Harvey and Stefano Toso and Sanjini Nanayakkara and Jonah Messinger and Joseph Luther and Masaru Juno",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

year = "2020",

doi = "10.1021/acsenergylett.0c01207",

language = "American English",

volume = "5",

pages = "2802--2810",

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Pavlovetc, I, Brennan, M, Draguta, S, Ruth, A, Moot, T, Christians, J, Aleshire, K, Harvey, S, Toso, S, Nanayakkara, S, Messinger, J, Luther, J & Juno, M 2020, 'Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites', ACS Energy Letters, vol. 5, no. 9, pp. 2802-2810. https://doi.org/10.1021/acsenergylett.0c01207, https://doi.org/10.1021/acsenergylett.0c01207

TY - JOUR

T1 - Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites

AU - Pavlovetc, Ilia

AU - Brennan, Michael

AU - Draguta, Sergiu

AU - Ruth, Anthony

AU - Moot, Taylor

AU - Christians, Jeffrey

AU - Aleshire, Kyle

AU - Harvey, Steve

AU - Toso, Stefano

AU - Nanayakkara, Sanjini

AU - Messinger, Jonah

AU - Luther, Joseph

AU - Juno, Masaru

PY - 2020

Y1 - 2020

N2 - Ion migration represents an intrinsic instability of metal halide perovskite solar cells. Here we show that triple-cation FAxMAyCs1-x-yPbI3 [FA+ = (NH2)2CH+, MA+ = CH3NH3+] active layers with mixed orthorhombic, post-perovskite (δortho-CsPbI3), and cubic perovskite (α) phases (i.e., α/δ-phase FAxMAyCs1-x-yPbI3) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA0.85Cs0.15PbI3 and FA0.76MA0.15Cs0.09PbI3). Infrared photothermal heterodyne imaging and time-of-flight secondary ion mass spectrometry are used to visualize exclusive α-phase perovskite lateral device A+ cation accumulation (depletion) at perovskite negative (positive) electrode interfaces. The resulting compositional heterogeneities lead to degradation. Operational stability testing of solar cells reveals similar degradation behavior; α/δ-phase FAxMAyCs1-x-yPbI3 lateral devices/solar cells, by contrast, show improved stabilities. Enhanced α/δ-FAxMAyCs1-x-yPbI3 stability is rationalized by δortho-phase inclusions, acting as barriers through which A+ cations do not easily migrate. This study thus provides new insights into cation migration in FAxMAyCs1-x-yPbI3 perovskites and suggests a materials design strategy toward suppressing cation instabilities in hybrid perovskites.

AB - Ion migration represents an intrinsic instability of metal halide perovskite solar cells. Here we show that triple-cation FAxMAyCs1-x-yPbI3 [FA+ = (NH2)2CH+, MA+ = CH3NH3+] active layers with mixed orthorhombic, post-perovskite (δortho-CsPbI3), and cubic perovskite (α) phases (i.e., α/δ-phase FAxMAyCs1-x-yPbI3) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA0.85Cs0.15PbI3 and FA0.76MA0.15Cs0.09PbI3). Infrared photothermal heterodyne imaging and time-of-flight secondary ion mass spectrometry are used to visualize exclusive α-phase perovskite lateral device A+ cation accumulation (depletion) at perovskite negative (positive) electrode interfaces. The resulting compositional heterogeneities lead to degradation. Operational stability testing of solar cells reveals similar degradation behavior; α/δ-phase FAxMAyCs1-x-yPbI3 lateral devices/solar cells, by contrast, show improved stabilities. Enhanced α/δ-FAxMAyCs1-x-yPbI3 stability is rationalized by δortho-phase inclusions, acting as barriers through which A+ cations do not easily migrate. This study thus provides new insights into cation migration in FAxMAyCs1-x-yPbI3 perovskites and suggests a materials design strategy toward suppressing cation instabilities in hybrid perovskites.

KW - cation migration

KW - perovskites

UR - http://www.scopus.com/inward/record.url?scp=85092295193&partnerID=8YFLogxK

U2 - 10.1021/acsenergylett.0c01207

DO - 10.1021/acsenergylett.0c01207

M3 - Article

AN - SCOPUS:85092295193

SN - 2380-8195

VL - 5

SP - 2802

EP - 2810

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 9

ER -

Suppressing Cation Migration in Triple-Cation Lead Halide Perovskites

Abstract

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Keywords

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