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Title: Enhancing Ion Migration in Grain Boundaries of Hybrid Organic-Inorganic Perovskites by Chlorine

Journal Article · · Advanced Functional Materials

Ionicity plays an important role in determining material properties, as well as optoelectronic performance of organometallic trihalide perovskites (OTPs). Ion migration in OTP films has recently been under intensive investigation by various scanning probe microscopy (SPM) techniques. However, controversial findings regarding the role of grain boundaries (GBs) associated with ion migration are often encountered, likely as a result of feedback errors and topographic effects common in to SPM. In this work, electron microscopy and spectroscopy (scanning transmission electron microscopy/electron energy loss spectroscopy) are combined with a novel, open‐loop, band‐excitation, (contact) Kelvin probe force microscopy (BE‐KPFM and BE‐cKPFM), in conjunction with ab initio molecular dynamics simulations to examine the ion behavior in the GBs of CH 3 NH 3 PbI 3 perovskite films. This combination of diverse techniques provides a deeper understanding of the differences between ion migration within GBs and interior grains in OTP films. This work demonstrates that ion migration can be significantly enhanced by introducing additional mobile Cl ions into GBs. The enhancement of ion migration may serve as the first step toward the development of high‐performance electrically and optically tunable memristors and synaptic devices.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; AC05-00OR22750; AC02-05CH11231; DE‐AC05‐00OR22750; DE‐AC02‐05CH11231
OSTI ID:
1376615
Alternate ID(s):
OSTI ID: 1400629
Journal Information:
Advanced Functional Materials, Vol. 27, Issue 26; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Cited By (15)

Unique Seamlessly Bonded CNT@Graphene Hybrid Nanostructure Introduced in an Interlayer for Efficient and Stable Perovskite Solar Cells journal June 2018
On the Current–Voltage Hysteresis in Perovskite Solar Cells: Dependence on Perovskite Composition and Methods to Remove Hysteresis journal February 2019
Versatile Defect Passivation Methods for Metal Halide Perovskite Materials and their Application to Light‐Emitting Devices journal December 2018
Electron‐Beam‐Related Studies of Halide Perovskites: Challenges and Opportunities journal February 2020
Memristors with organic‐inorganic halide perovskites journal May 2019
Scanning Probe Microscopy Applied to Organic-Inorganic Halide Perovskite Materials and Solar Cells journal December 2017
Ion Migration: A “Double‐Edged Sword” for Halide‐Perovskite‐Based Electronic Devices journal November 2019
From Macroscopic to Nanoscopic Current Hysteresis Suppressed by Fullerene in Perovskite Solar Cells journal August 2019
Efficient two-terminal all-perovskite tandem solar cells enabled by high-quality low-bandgap absorber layers journal November 2018
Single-crystalline perovskite wafers with a Cr blocking layer for broad and stable light detection in a harsh environment journal January 2018
Efficient methylammonium lead trihalide perovskite solar cells with chloroformamidinium chloride (Cl-FACl) as an additive journal January 2019
Dynamic behavior of CH 3 NH 3 PbI 3 perovskite twin domains journal August 2018
Ion induced passivation of grain boundaries in perovskite solar cells journal May 2019
Giant Zero-Drift Electronic Behaviors in Methylammonium Lead Halide Perovskite Diodes by Doping Iodine Ions journal September 2018
Ion Induced Passivation of Grain Boundaries in Perovskite Solar Cells text January 2018

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