Impacts of Ion Segregation on Local Optical Properties in Mixed Halide Perovskite Films
Abstract
Despite the recent astronomical success of organic–inorganic perovskite solar cells (PSCs), the impact of microscale film inhomogeneities on device performance remains poorly understood. In this work, we study CH3NH3PbI3 perovskite films using cathodoluminescence in scanning transmission electron microscopy and show that localized regions with increased cathodoluminescence intensity correspond to iodide-enriched regions. These observations constitute direct evidence that nanoscale stoichiometric variations produce corresponding inhomogeneities in film cathodoluminescence intensity. Furthermore, we observe the emergence of high-energy transitions attributed to beam induced iodide segregation, which may mirror the effects of ion migration during PSC operation. Our results demonstrate that such ion segregation can fundamentally change the local optical and microstructural properties of organic–inorganic perovskite films in the course of normal device operation and thus address the observed complex and unpredictable behavior in PSC devices.
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1371385
- Grant/Contract Number:
- SC0001088; DMR-1419807
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 16; Journal Issue: 2; Related Information: CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Methylammonium-lead halide perovskite; cathodoluminescence; ion migration; optical properties; organic−inorganic perovskite; solar cells
Citation Formats
Hentz, Olivia, Zhao, Zhibo, and Gradečak, Silvija. Impacts of Ion Segregation on Local Optical Properties in Mixed Halide Perovskite Films. United States: N. p., 2016.
Web. doi:10.1021/acs.nanolett.5b05181.
Hentz, Olivia, Zhao, Zhibo, & Gradečak, Silvija. Impacts of Ion Segregation on Local Optical Properties in Mixed Halide Perovskite Films. United States. https://doi.org/10.1021/acs.nanolett.5b05181
Hentz, Olivia, Zhao, Zhibo, and Gradečak, Silvija. Wed .
"Impacts of Ion Segregation on Local Optical Properties in Mixed Halide Perovskite Films". United States. https://doi.org/10.1021/acs.nanolett.5b05181. https://www.osti.gov/servlets/purl/1371385.
@article{osti_1371385,
title = {Impacts of Ion Segregation on Local Optical Properties in Mixed Halide Perovskite Films},
author = {Hentz, Olivia and Zhao, Zhibo and Gradečak, Silvija},
abstractNote = {Despite the recent astronomical success of organic–inorganic perovskite solar cells (PSCs), the impact of microscale film inhomogeneities on device performance remains poorly understood. In this work, we study CH3NH3PbI3 perovskite films using cathodoluminescence in scanning transmission electron microscopy and show that localized regions with increased cathodoluminescence intensity correspond to iodide-enriched regions. These observations constitute direct evidence that nanoscale stoichiometric variations produce corresponding inhomogeneities in film cathodoluminescence intensity. Furthermore, we observe the emergence of high-energy transitions attributed to beam induced iodide segregation, which may mirror the effects of ion migration during PSC operation. Our results demonstrate that such ion segregation can fundamentally change the local optical and microstructural properties of organic–inorganic perovskite films in the course of normal device operation and thus address the observed complex and unpredictable behavior in PSC devices.},
doi = {10.1021/acs.nanolett.5b05181},
journal = {Nano Letters},
number = 2,
volume = 16,
place = {United States},
year = {Wed Jan 13 00:00:00 EST 2016},
month = {Wed Jan 13 00:00:00 EST 2016}
}
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