Separating Bulk and Surface Contributions to Electronic Excited-State Processes in Hybrid Mixed Perovskite Thin Films via Multimodal All-Optical Imaging

Simpson, Mary Jane; Doughty, Benjamin; Das, Sanjib; Xiao, Kai; Ma, Ying-Zhong

doi:10.1021/acs.jpclett.7b01368

Title: Separating Bulk and Surface Contributions to Electronic Excited-State Processes in Hybrid Mixed Perovskite Thin Films via Multimodal All-Optical Imaging

Abstract

A comprehensive understanding of electronic excited-state phenomena underlying the impressive performance of solution-processed hybrid halide perovskite solar cells requires access to both spatially resolved electronic processes and corresponding sample morphological characteristics. In this paper, we demonstrate an all-optical multimodal imaging approach that enables us to obtain both electronic excited-state and morphological information on a single optical microscope platform with simultaneous high temporal and spatial resolution. Specifically, images were acquired for the same region of interest in thin films of chloride containing mixed lead halide perovskites (CH₃NH₃PbI_3–xCl_x) using femtosecond transient absorption, time-integrated photoluminescence, confocal reflectance, and transmission microscopies. Comprehensive image analysis revealed the presence of surface- and bulk-dominated contributions to the various images, which describe either spatially dependent electronic excited-state properties or morphological variations across the probed region of the thin films. Finally, these results show that PL probes effectively the species near or at the film surface.

Authors:

Simpson, Mary Jane ^[1]; Doughty, Benjamin ^[1];

^[2];

^[3];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Electrical Engineering and Computer Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences

Publication Date:: Tue Jul 04 00:00:00 EDT 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Contributing Org.:: Univ. of Tennessee, Knoxville, TN (United States)

OSTI Identifier:: 1376475

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physical Chemistry Letters

Additional Journal Information:: Journal Volume: 8; Journal Issue: 14; Journal ID: ISSN 1948-7185

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Simpson, Mary Jane, Doughty, Benjamin, Das, Sanjib, Xiao, Kai, and Ma, Ying-Zhong. Separating Bulk and Surface Contributions to Electronic Excited-State Processes in Hybrid Mixed Perovskite Thin Films via Multimodal All-Optical Imaging.  United States: N. p., 2017. 
Web.  doi:10.1021/acs.jpclett.7b01368.

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                    Simpson, Mary Jane, Doughty, Benjamin, Das, Sanjib, Xiao, Kai, & Ma, Ying-Zhong. Separating Bulk and Surface Contributions to Electronic Excited-State Processes in Hybrid Mixed Perovskite Thin Films via Multimodal All-Optical Imaging.  United States.  https://doi.org/10.1021/acs.jpclett.7b01368

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                    Simpson, Mary Jane, Doughty, Benjamin, Das, Sanjib, Xiao, Kai, and Ma, Ying-Zhong. Tue .  
"Separating Bulk and Surface Contributions to Electronic Excited-State Processes in Hybrid Mixed Perovskite Thin Films via Multimodal All-Optical Imaging".  United States.  https://doi.org/10.1021/acs.jpclett.7b01368.  https://www.osti.gov/servlets/purl/1376475.

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@article{osti_1376475,

  title        = {Separating Bulk and Surface Contributions to Electronic Excited-State Processes in Hybrid Mixed Perovskite Thin Films via Multimodal All-Optical Imaging},

  author       = {Simpson, Mary Jane and Doughty, Benjamin and Das, Sanjib and Xiao, Kai and Ma, Ying-Zhong},

  abstractNote = {A comprehensive understanding of electronic excited-state phenomena underlying the impressive performance of solution-processed hybrid halide perovskite solar cells requires access to both spatially resolved electronic processes and corresponding sample morphological characteristics. In this paper, we demonstrate an all-optical multimodal imaging approach that enables us to obtain both electronic excited-state and morphological information on a single optical microscope platform with simultaneous high temporal and spatial resolution. Specifically, images were acquired for the same region of interest in thin films of chloride containing mixed lead halide perovskites (CH3NH3PbI3–xClx) using femtosecond transient absorption, time-integrated photoluminescence, confocal reflectance, and transmission microscopies. Comprehensive image analysis revealed the presence of surface- and bulk-dominated contributions to the various images, which describe either spatially dependent electronic excited-state properties or morphological variations across the probed region of the thin films. Finally, these results show that PL probes effectively the species near or at the film surface.},

  doi          = {10.1021/acs.jpclett.7b01368},

  journal      = {Journal of Physical Chemistry Letters},

  number       = 14,

  volume       = 8,

  place        = {United States},

  year         = {Tue Jul 04 00:00:00 EDT 2017},

  month        = {Tue Jul 04 00:00:00 EDT 2017}

}

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Works referenced in this record:

Metal-halide perovskites for photovoltaic and light-emitting devices
journal, May 2015

Stranks, Samuel D.; Snaith, Henry J.
Nature Nanotechnology, Vol. 10, Issue 5
DOI: 10.1038/nnano.2015.90

Organohalide Perovskites for Solar Energy Conversion
journal, February 2016

Lin, Qianqian; Armin, Ardalan; Burn, Paul L.
Accounts of Chemical Research, Vol. 49, Issue 3
DOI: 10.1021/acs.accounts.5b00483

Perovskite photonic sources
journal, April 2016

Sutherland, Brandon R.; Sargent, Edward H.
Nature Photonics, Vol. 10, Issue 5
DOI: 10.1038/nphoton.2016.62

Hybrid organic—inorganic perovskites: low-cost semiconductors with intriguing charge-transport properties
journal, January 2016

Brenner, Thomas M.; Egger, David A.; Kronik, Leeor
Nature Reviews Materials, Vol. 1, Issue 1
DOI: 10.1038/natrevmats.2015.7

Advancements in perovskite solar cells: photophysics behind the photovoltaics
journal, January 2014

Sum, Tze Chien; Mathews, Nripan
Energy Environ. Sci., Vol. 7, Issue 8
DOI: 10.1039/C4EE00673A

Multifaceted Excited State of CH ₃ NH ₃ PbI ₃ . Charge Separation, Recombination, and Trapping
journal, May 2015

Christians, Jeffrey A.; Manser, Joseph S.; Kamat, Prashant V.
The Journal of Physical Chemistry Letters, Vol. 6, Issue 11
DOI: 10.1021/acs.jpclett.5b00594

Photophysics of Hybrid Lead Halide Perovskites: The Role of Microstructure
journal, February 2016

Srimath Kandada, Ajay Ram; Petrozza, Annamaria
Accounts of Chemical Research, Vol. 49, Issue 3
DOI: 10.1021/acs.accounts.5b00464

Perovskite Solar Cells with Near 100% Internal Quantum Efficiency Based on Large Single Crystalline Grains and Vertical Bulk Heterojunctions
journal, July 2015

Yang, Bin; Dyck, Ondrej; Poplawsky, Jonathan
Journal of the American Chemical Society, Vol. 137, Issue 29
DOI: 10.1021/jacs.5b03144

Interface engineering of highly efficient perovskite solar cells
journal, July 2014

Zhou, H.; Chen, Q.; Li, G.
Science, Vol. 345, Issue 6196
DOI: 10.1126/science.1254050

High-efficiency solution-processed perovskite solar cells with millimeter-scale grains
journal, January 2015

Nie, W.; Tsai, H.; Asadpour, R.
Science, Vol. 347, Issue 6221, p. 522-525
DOI: 10.1126/science.aaa0472

Trap States in Lead Iodide Perovskites
journal, January 2015

Wu, Xiaoxi; Trinh, M. Tuan; Niesner, Daniel
Journal of the American Chemical Society, Vol. 137, Issue 5
DOI: 10.1021/ja512833n

Low thermal budget, photonic-cured compact TiO ₂ layers for high-efficiency perovskite solar cells
journal, January 2016

Das, Sanjib; Gu, Gong; Joshi, Pooran C.
Journal of Materials Chemistry A, Vol. 4, Issue 24
DOI: 10.1039/C6TA02105K

Sub-10 fs Time-Resolved Vibronic Optical Microscopy
journal, November 2016

Schnedermann, Christoph; Lim, Jong Min; Wende, Torsten
The Journal of Physical Chemistry Letters, Vol. 7, Issue 23
DOI: 10.1021/acs.jpclett.6b02387

Spatial Localization of Excitons and Charge Carriers in Hybrid Perovskite Thin Films
journal, July 2015

Simpson, Mary Jane; Doughty, Benjamin; Yang, Bin
The Journal of Physical Chemistry Letters, Vol. 6, Issue 15
DOI: 10.1021/acs.jpclett.5b01050

Impact of microstructure on local carrier lifetime in perovskite solar cells
journal, April 2015

de Quilettes, D. W.; Vorpahl, S. M.; Stranks, S. D.
Science, Vol. 348, Issue 6235
DOI: 10.1126/science.aaa5333

Local Versus Long-Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic-Inorganic Lead Halide Perovskites
journal, July 2015

Vrućinić, Milan; Matthiesen, Clemens; Sadhanala, Aditya
Advanced Science, Vol. 2, Issue 9
DOI: 10.1002/advs.201500136

Separation of Distinct Photoexcitation Species in Femtosecond Transient Absorption Microscopy
journal, February 2016

Simpson, Mary Jane; Doughty, Benjamin; Yang, Bin
ACS Photonics, Vol. 3, Issue 3
DOI: 10.1021/acsphotonics.5b00638

Spatially Non-uniform Trap State Densities in Solution-Processed Hybrid Perovskite Thin Films
journal, February 2016

Draguta, Sergiu; Thakur, Siddharatha; Morozov, Yurii V.
The Journal of Physical Chemistry Letters, Vol. 7, Issue 4
DOI: 10.1021/acs.jpclett.5b02888

Imaging Electronic Trap States in Perovskite Thin Films with Combined Fluorescence and Femtosecond Transient Absorption Microscopy
journal, April 2016

Simpson, Mary Jane; Doughty, Benjamin; Yang, Bin
The Journal of Physical Chemistry Letters, Vol. 7, Issue 9
DOI: 10.1021/acs.jpclett.6b00715

Elucidation of Perovskite Film Micro-Orientations Using Two-Photon Total Internal Reflectance Fluorescence Microscopy
journal, July 2015

Watson, Brianna R.; Yang, Bin; Xiao, Kai
The Journal of Physical Chemistry Letters, Vol. 6, Issue 16
DOI: 10.1021/acs.jpclett.5b01474

Spatial and temporal imaging of long-range charge transport in perovskite thin films by ultrafast microscopy
journal, June 2015

Guo, Zhi; Manser, Joseph S.; Wan, Yan
Nature Communications, Vol. 6, Issue 1
DOI: 10.1038/ncomms8471

Long-range hot-carrier transport in hybrid perovskites visualized by ultrafast microscopy
journal, April 2017

Guo, Zhi; Wan, Yan; Yang, Mengjin
Science, Vol. 356, Issue 6333
DOI: 10.1126/science.aam7744

Investigation of CH ₃ NH ₃ PbI ₃ Degradation Rates and Mechanisms in Controlled Humidity Environments Using in Situ Techniques
journal, January 2015

Yang, Jinli; Siempelkamp, Braden D.; Liu, Dianyi
ACS Nano, Vol. 9, Issue 2
DOI: 10.1021/nn506864k

Transformation of the Excited State and Photovoltaic Efficiency of CH ₃ NH ₃ PbI ₃ Perovskite upon Controlled Exposure to Humidified Air
journal, January 2015

Christians, Jeffrey A.; Miranda Herrera, Pierre A.; Kamat, Prashant V.
Journal of the American Chemical Society, Vol. 137, Issue 4
DOI: 10.1021/ja511132a

Deep Data Analysis of Conductive Phenomena on Complex Oxide Interfaces: Physics from Data Mining
journal, May 2014

Strelcov, Evgheni; Belianinov, Alexei; Hsieh, Ying-Hui
ACS Nano, Vol. 8, Issue 6
DOI: 10.1021/nn502029b

Electro-optics of perovskite solar cells
journal, December 2014

Lin, Qianqian; Armin, Ardalan; Nagiri, Ravi Chandra Raju
Nature Photonics, Vol. 9, Issue 2
DOI: 10.1038/nphoton.2014.284

Dispersion of Nitrogen*
journal, January 1966

Peck, Edson R.; Khanna, Baij Nath
Journal of the Optical Society of America, Vol. 56, Issue 8
DOI: 10.1364/JOSA.56.001059

Homogeneous Emission Line Broadening in the Organo Lead Halide Perovskite CH ₃ NH ₃ PbI _{3– x} Cl _x
journal, March 2014

Wehrenfennig, Christian; Liu, Mingzhen; Snaith, Henry J.
The Journal of Physical Chemistry Letters, Vol. 5, Issue 8
DOI: 10.1021/jz500434p

Discerning the Surface and Bulk Recombination Kinetics of Organic-Inorganic Halide Perovskite Single Crystals
journal, May 2016

Wu, Bo; Nguyen, Huy Tiep; Ku, Zhiliang
Advanced Energy Materials, Vol. 6, Issue 14
DOI: 10.1002/aenm.201600551

Top and bottom surfaces limit carrier lifetime in lead iodide perovskite films
journal, January 2017

Yang, Ye; Yang, Mengjin; Moore, David T.
Nature Energy, Vol. 2, Issue 2
DOI: 10.1038/nenergy.2016.207

Enhancing photoluminescence yields in lead halide perovskites by photon recycling and light out-coupling
journal, December 2016

Richter, Johannes M.; Abdi-Jalebi, Mojtaba; Sadhanala, Aditya
Nature Communications, Vol. 7, Issue 1
DOI: 10.1038/ncomms13941

Charge-Carrier Dynamics in Organic-Inorganic Metal Halide Perovskites
journal, May 2016

Herz, Laura M.
Annual Review of Physical Chemistry, Vol. 67, Issue 1
DOI: 10.1146/annurev-physchem-040215-112222

Simplification of femtosecond transient absorption microscopy data from CH 3 NH 3 PbI 3 perovskite thin films into decay associated amplitude maps
journal, February 2016

Doughty, Benjamin; Simpson, Mary Jane; Yang, Bin
Nanotechnology, Vol. 27, Issue 11
DOI: 10.1088/0957-4484/27/11/114002

Pump-probe scanning near field optical microscopy: Sub-wavelength resolution chemical imaging and ultrafast local dynamics
journal, April 2012

Karki, Khadga; Namboodiri, Mahesh; Zeb Khan, Tahir
Applied Physics Letters, Vol. 100, Issue 15
DOI: 10.1063/1.3701724

Works referencing / citing this record:

Three applications of ultrafast transient absorption spectroscopy of semiconductor thin films: spectroelectrochemistry, microscopy, and identification of thermal contributions
journal, January 2018

Knowles, Kathryn E.; Koch, Melissa D.; Shelton, Jacob L.
Journal of Materials Chemistry C, Vol. 6, Issue 44
DOI: 10.1039/c8tc02977f

Ultrafast measurements of the dynamics of single nanostructures: a review
journal, November 2018

Beane, Gary; Devkota, Tuphan; Brown, Brendan S.
Reports on Progress in Physics, Vol. 82, Issue 1
DOI: 10.1088/1361-6633/aaea4b

Visualizing the impact of chloride addition on the microscopic carrier dynamics of MAPbI ₃ thin films using femtosecond transient absorption microscopy
journal, December 2019

Yu, Jin; Li, Zhongguo; Kolodziej, Charles
The Journal of Chemical Physics, Vol. 151, Issue 23
DOI: 10.1063/1.5127875

Probing the Spatial Heterogeneity of Carrier Relaxation Dynamics in CH ₃ NH ₃ PbI ₃ Perovskite Thin Films with Femtosecond Time‐Resolved Nonlinear Optical Microscopy
journal, August 2019

Yu, Jin; Li, Zhongguo; Liao, Yuheng
Advanced Optical Materials, Vol. 7, Issue 22
DOI: 10.1002/adom.201901185

Edge Effect on the Population of Free Carriers and Excitons in Single‐Crystal CH ₃ NH ₃ PbBr ₃ Perovskite Nanomaterials
journal, May 2019

Zhang, Zhen‐Yu; Yu, Kuai; Wang, Guo‐Ping
Advanced Electronic Materials, Vol. 5, Issue 7
DOI: 10.1002/aelm.201900216

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Title: Separating Bulk and Surface Contributions to Electronic Excited-State Processes in Hybrid Mixed Perovskite Thin Films via Multimodal All-Optical Imaging

Abstract

Citation Formats

Metal-halide perovskites for photovoltaic and light-emitting devices journal, May 2015

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