Relationship between the Nature of Monovalent Cations and Charge Recombination in Metal Halide Perovskites

Katelyn A. Dagnall; Benjamin J. Foley; Shelby A. Cuthriell; Matthew R. Alpert; Xiaoyu Deng; Alexander Z. Chen; Zeming Sun; Mool C. Gupta; Kai Xiao; Seung Hun Lee; Ying Zhong Ma; Joshua J. Choi

doi:10.1021/acsaem.9b02310

Relationship between the Nature of Monovalent Cations and Charge Recombination in Metal Halide Perovskites

Katelyn A. Dagnall
, Benjamin J. Foley
, Shelby A. Cuthriell
, Matthew R. Alpert
, Xiaoyu Deng
, Alexander Z. Chen
, Zeming Sun
, Mool C. Gupta
, Kai Xiao
, Seung Hun Lee
, Ying Zhong Ma
, Joshua J. Choi

Functional Hybrid Nanomaterials

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

11 Scopus citations

Abstract

We report charge recombination rates in lead iodide perovskites with alloys of formamidinium (FA) and methylammonium (MA) cations, FA_xMA_1-xPbI₃, 0 ≤ x ≤ 0.9, prepared through ion exchange with minimal differences in morphology and charge trap density. Our results show that the trap-mediated recombination rate increases over 2 orders of magnitude with decreasing MA content. These results are consistent with a proposed mechanism that MA molecules are more effective in screening charged defects. In contrast, band-to-band charge recombination rates are minimized at an intermediate alloy composition. These findings reveal that the monovalent cations impact recombination processes through different mechanisms.

Original language	English
Pages (from-to)	1298-1304
Number of pages	7
Journal	ACS Applied Energy Materials
Volume	3
Issue number	2
DOIs	https://doi.org/10.1021/acsaem.9b02310
State	Published - Feb 24 2020

Funding

J.J.C. and S.-H.L. acknowledge support from the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0016144. The work at Oak Ridge National Laboratory (ORNL) was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division (Y.-Z.M.) and the U.S. Department of Energy Office of Science Graduate Student Research program (B.J.F).

Keywords

alloys
charge carrier recombination
ion exchange
perovskites
renewable energy materials
ultrafast spectroscopy

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10.1021/acsaem.9b02310

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title = "Relationship between the Nature of Monovalent Cations and Charge Recombination in Metal Halide Perovskites",

abstract = "We report charge recombination rates in lead iodide perovskites with alloys of formamidinium (FA) and methylammonium (MA) cations, FAxMA1-xPbI3, 0 ≤ x ≤ 0.9, prepared through ion exchange with minimal differences in morphology and charge trap density. Our results show that the trap-mediated recombination rate increases over 2 orders of magnitude with decreasing MA content. These results are consistent with a proposed mechanism that MA molecules are more effective in screening charged defects. In contrast, band-to-band charge recombination rates are minimized at an intermediate alloy composition. These findings reveal that the monovalent cations impact recombination processes through different mechanisms.",

keywords = "alloys, charge carrier recombination, ion exchange, perovskites, renewable energy materials, ultrafast spectroscopy",

author = "Dagnall, \{Katelyn A.\} and Foley, \{Benjamin J.\} and Cuthriell, \{Shelby A.\} and Alpert, \{Matthew R.\} and Xiaoyu Deng and Chen, \{Alexander Z.\} and Zeming Sun and Gupta, \{Mool C.\} and Kai Xiao and Lee, \{Seung Hun\} and Ma, \{Ying Zhong\} and Choi, \{Joshua J.\}",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

year = "2020",

month = feb,

day = "24",

doi = "10.1021/acsaem.9b02310",

language = "English",

volume = "3",

pages = "1298--1304",

journal = "ACS Applied Energy Materials",

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TY - JOUR

T1 - Relationship between the Nature of Monovalent Cations and Charge Recombination in Metal Halide Perovskites

AU - Dagnall, Katelyn A.

AU - Foley, Benjamin J.

AU - Cuthriell, Shelby A.

AU - Alpert, Matthew R.

AU - Deng, Xiaoyu

AU - Chen, Alexander Z.

AU - Sun, Zeming

AU - Gupta, Mool C.

AU - Xiao, Kai

AU - Lee, Seung Hun

AU - Ma, Ying Zhong

AU - Choi, Joshua J.

PY - 2020/2/24

Y1 - 2020/2/24

N2 - We report charge recombination rates in lead iodide perovskites with alloys of formamidinium (FA) and methylammonium (MA) cations, FAxMA1-xPbI3, 0 ≤ x ≤ 0.9, prepared through ion exchange with minimal differences in morphology and charge trap density. Our results show that the trap-mediated recombination rate increases over 2 orders of magnitude with decreasing MA content. These results are consistent with a proposed mechanism that MA molecules are more effective in screening charged defects. In contrast, band-to-band charge recombination rates are minimized at an intermediate alloy composition. These findings reveal that the monovalent cations impact recombination processes through different mechanisms.

AB - We report charge recombination rates in lead iodide perovskites with alloys of formamidinium (FA) and methylammonium (MA) cations, FAxMA1-xPbI3, 0 ≤ x ≤ 0.9, prepared through ion exchange with minimal differences in morphology and charge trap density. Our results show that the trap-mediated recombination rate increases over 2 orders of magnitude with decreasing MA content. These results are consistent with a proposed mechanism that MA molecules are more effective in screening charged defects. In contrast, band-to-band charge recombination rates are minimized at an intermediate alloy composition. These findings reveal that the monovalent cations impact recombination processes through different mechanisms.

KW - alloys

KW - charge carrier recombination

KW - ion exchange

KW - perovskites

KW - renewable energy materials

KW - ultrafast spectroscopy

UR - https://www.scopus.com/pages/publications/85081034649

U2 - 10.1021/acsaem.9b02310

DO - 10.1021/acsaem.9b02310

M3 - Article

AN - SCOPUS:85081034649

SN - 2574-0962

VL - 3

SP - 1298

EP - 1304

JO - ACS Applied Energy Materials

JF - ACS Applied Energy Materials

IS - 2

ER -

Relationship between the Nature of Monovalent Cations and Charge Recombination in Metal Halide Perovskites

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