Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films

doi:10.1021/jacs.9b04568

Title: Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films

Abstract

Halide ion mobility in metal halide perovskites remains an intriguing phenomenon, influencing their optical and photovoltaic properties. Selective injection of holes through electrochemical anodic bias has allowed us to probe the effect of hole trapping at iodide (0.9 V) and bromide (1.15 V) in mixed halide perovskite (CH₃NH₃PbBr_1.5I_1.5) films. Upon trapping holes at the iodide site, the iodide gradually gets expelled from the mixed halide film (as iodine and/or triiodide ion), leaving behind re-formed CH₃NH₃PbBr₃ domains. The weakening of the Pb-I bond following the hole trapping (oxidation of the iodide site) and its expulsion from the lattice in the form of iodine provided further insight into the photoinduced segregation of halide ions in mixed halide perovskite films. Transient absorption spectroscopy revealed that the iodide expulsion process leaves a defect-rich perovskite lattice behind as charge carrier recombination in the re-formed lattice is greatly accelerated. The selective mobility of iodide species provides insight into the photoinduced phase segregation and its implication in the stable operation of perovskite solar cells.

Authors:

^[1]; Balog, Ádám ^[2];

^[3];

^[4];

^[5];

^[6]

Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged, H-6720, Hungary, ELI-ALPS Research Institute, Dugonics Square 13, Szeged, 6720, Hungary, Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged, H-6720, Hungary
Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto, 8I-06123 Perugia, Italy, Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, 06123 Perugia, Italy, CompuNet, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, 06123 Perugia, Italy, CompuNet, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States, Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States
Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged, H-6720, Hungary, ELI-ALPS Research Institute, Dugonics Square 13, Szeged, 6720, Hungary

Publication Date:: 2019-06-19

Research Org.:: Univ. of Szeged (Hungary)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

OSTI Identifier:: 1530479

Alternate Identifier(s):: OSTI ID: 1542124

Grant/Contract Number:: FC02-04ER15533

Resource Type:: Published Article

Journal Name:: Journal of the American Chemical Society

Additional Journal Information:: Journal Name: Journal of the American Chemical Society Journal Volume: 141 Journal Issue: 27; Journal ID: ISSN 0002-7863

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Samu, Gergely F., Balog, Ádám, De Angelis, Filippo, Meggiolaro, Daniele, Kamat, Prashant V., and Janáky, Csaba. Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films.  United States: N. p., 2019. 
        Web.  doi:10.1021/jacs.9b04568.

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                    Samu, Gergely F., Balog, Ádám, De Angelis, Filippo, Meggiolaro, Daniele, Kamat, Prashant V., & Janáky, Csaba. Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films.  United States.  doi:10.1021/jacs.9b04568.

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                    Samu, Gergely F., Balog, Ádám, De Angelis, Filippo, Meggiolaro, Daniele, Kamat, Prashant V., and Janáky, Csaba. Wed .  
        "Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films".  United States.  doi:10.1021/jacs.9b04568.

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@article{osti_1530479,

  title        = {Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films},

  author       = {Samu, Gergely F. and Balog, Ádám and De Angelis, Filippo and Meggiolaro, Daniele and Kamat, Prashant V. and Janáky, Csaba},

  abstractNote = {Halide ion mobility in metal halide perovskites remains an intriguing phenomenon, influencing their optical and photovoltaic properties. Selective injection of holes through electrochemical anodic bias has allowed us to probe the effect of hole trapping at iodide (0.9 V) and bromide (1.15 V) in mixed halide perovskite (CH3NH3PbBr1.5I1.5) films. Upon trapping holes at the iodide site, the iodide gradually gets expelled from the mixed halide film (as iodine and/or triiodide ion), leaving behind re-formed CH3NH3PbBr3 domains. The weakening of the Pb-I bond following the hole trapping (oxidation of the iodide site) and its expulsion from the lattice in the form of iodine provided further insight into the photoinduced segregation of halide ions in mixed halide perovskite films. Transient absorption spectroscopy revealed that the iodide expulsion process leaves a defect-rich perovskite lattice behind as charge carrier recombination in the re-formed lattice is greatly accelerated. The selective mobility of iodide species provides insight into the photoinduced phase segregation and its implication in the stable operation of perovskite solar cells.},

  doi          = {10.1021/jacs.9b04568},

  journal      = {Journal of the American Chemical Society},

  number       = 27,

  volume       = 141,

  place        = {United States},

  year         = {2019},

  month        = {6}

}

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DOI: 10.1021/jacs.9b04568

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Figure 1: (A) Linear sweep voltammograms of FTO/MAPbBr_xI_3−x films in 0.1 M Bu₄NPF₆/DCM electrolyte (5 mV s⁻¹ sweep rate). (B) Band diagram of MAPbBr_1.5I_1.5 together with the peak onset of the observed Faradaic events. (C) Variation of the peak currents of the first two redox waves as a function ofmore »

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