Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals

Wei Peng; Clara Aranda; Osman Bakr; Germà Garcia-Belmonte; Juan Bisquert; Antonio Guerrero

doi:10.1021/acsenergylett.8b00641

Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals

Wei Peng, Clara Aranda, Osman Bakr, Germà Garcia-Belmonte, Juan Bisquert, Antonio Guerrero

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

127 Scopus citations

Abstract

Lead halide perovskites are mixed electronic/ionic semiconductors that have recently revolutionized the photovoltaics field. The physical characterization of the ionic conductivity has been rather elusive due to the highly intermixing of ionic and electronic current. In this work the synthesis of low defect density monocrystalline MAPbBr3 (MA=Methyl ammonium) solar cells free of hole transport layer (HTL) suppresses the effect of electronic current. Impedance spectroscopy reveals the characteristic signature of ionic diffusion (the Warburg element and transmission line equivalent circuit) and ion accumulation at the MAPbBr3/Au interface. Diffusion coefficients are calculated based on a good correlation between thickness of MAPbBr3 and characteristic diffusion transition frequency. In addition, reactive external interfaces are studied by comparison of polycrystalline MAPbBr3 devices prepared either with or without a HTL. The low frequency response in IS measurements is correlated with the chemical reactivity of moving ions with the external interfaces and diffusion into the HTL.

Original language	English (US)
Pages (from-to)	1477-1481
Number of pages	5
Journal	ACS Energy Letters
Volume	3
Issue number	7
DOIs	https://doi.org/10.1021/acsenergylett.8b00641
State	Published - May 25 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We acknowledge funding from Spanish Ministerio de Economía y Competitividad of Spain under Project MAT2016-76892-C3-1-R and for a Ramón y Cajal Fellowship (RYC-2014-16809). OMB and WP acknowledge the financial support of KAUST.

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10.1021/acsenergylett.8b00641

https://repository.kaust.edu.sa/bitstream/10754/627981/1/acsenergylett.8b00641.pdf

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@article{0489eec83811436cbf67a401501a3b59,

title = "Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals",

abstract = "Lead halide perovskites are mixed electronic/ionic semiconductors that have recently revolutionized the photovoltaics field. The physical characterization of the ionic conductivity has been rather elusive due to the highly intermixing of ionic and electronic current. In this work the synthesis of low defect density monocrystalline MAPbBr3 (MA=Methyl ammonium) solar cells free of hole transport layer (HTL) suppresses the effect of electronic current. Impedance spectroscopy reveals the characteristic signature of ionic diffusion (the Warburg element and transmission line equivalent circuit) and ion accumulation at the MAPbBr3/Au interface. Diffusion coefficients are calculated based on a good correlation between thickness of MAPbBr3 and characteristic diffusion transition frequency. In addition, reactive external interfaces are studied by comparison of polycrystalline MAPbBr3 devices prepared either with or without a HTL. The low frequency response in IS measurements is correlated with the chemical reactivity of moving ions with the external interfaces and diffusion into the HTL.",

author = "Wei Peng and Clara Aranda and Osman Bakr and Germ{\`a} Garcia-Belmonte and Juan Bisquert and Antonio Guerrero",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: We acknowledge funding from Spanish Ministerio de Econom{\'i}a y Competitividad of Spain under Project MAT2016-76892-C3-1-R and for a Ram{\'o}n y Cajal Fellowship (RYC-2014-16809). OMB and WP acknowledge the financial support of KAUST.",

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language = "English (US)",

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T1 - Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals

AU - Peng, Wei

AU - Aranda, Clara

AU - Bakr, Osman

AU - Garcia-Belmonte, Germà

AU - Bisquert, Juan

AU - Guerrero, Antonio

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: We acknowledge funding from Spanish Ministerio de Economía y Competitividad of Spain under Project MAT2016-76892-C3-1-R and for a Ramón y Cajal Fellowship (RYC-2014-16809). OMB and WP acknowledge the financial support of KAUST.

PY - 2018/5/25

Y1 - 2018/5/25

N2 - Lead halide perovskites are mixed electronic/ionic semiconductors that have recently revolutionized the photovoltaics field. The physical characterization of the ionic conductivity has been rather elusive due to the highly intermixing of ionic and electronic current. In this work the synthesis of low defect density monocrystalline MAPbBr3 (MA=Methyl ammonium) solar cells free of hole transport layer (HTL) suppresses the effect of electronic current. Impedance spectroscopy reveals the characteristic signature of ionic diffusion (the Warburg element and transmission line equivalent circuit) and ion accumulation at the MAPbBr3/Au interface. Diffusion coefficients are calculated based on a good correlation between thickness of MAPbBr3 and characteristic diffusion transition frequency. In addition, reactive external interfaces are studied by comparison of polycrystalline MAPbBr3 devices prepared either with or without a HTL. The low frequency response in IS measurements is correlated with the chemical reactivity of moving ions with the external interfaces and diffusion into the HTL.

AB - Lead halide perovskites are mixed electronic/ionic semiconductors that have recently revolutionized the photovoltaics field. The physical characterization of the ionic conductivity has been rather elusive due to the highly intermixing of ionic and electronic current. In this work the synthesis of low defect density monocrystalline MAPbBr3 (MA=Methyl ammonium) solar cells free of hole transport layer (HTL) suppresses the effect of electronic current. Impedance spectroscopy reveals the characteristic signature of ionic diffusion (the Warburg element and transmission line equivalent circuit) and ion accumulation at the MAPbBr3/Au interface. Diffusion coefficients are calculated based on a good correlation between thickness of MAPbBr3 and characteristic diffusion transition frequency. In addition, reactive external interfaces are studied by comparison of polycrystalline MAPbBr3 devices prepared either with or without a HTL. The low frequency response in IS measurements is correlated with the chemical reactivity of moving ions with the external interfaces and diffusion into the HTL.

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DO - 10.1021/acsenergylett.8b00641

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JO - ACS Energy Letters

JF - ACS Energy Letters

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Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals

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