Mixed-Halide Perovskites with Stabilized Bandgaps

Zhengguo Xiao; Lianfeng Zhao; Nhu L. Tran; Yunhui Lisa Lin; Scott H. Silver; Ross A. Kerner; Nan Yao; Antoine Kahn; Gregory D. Scholes; Barry P. Rand

doi:10.1021/acs.nanolett.7b03179

Mixed-Halide Perovskites with Stabilized Bandgaps

Zhengguo Xiao, Lianfeng Zhao, Nhu L. Tran, Yunhui Lisa Lin, Scott H. Silver, Ross A. Kerner, Nan Yao, Antoine Kahn, Gregory D. Scholes, Barry P. Rand

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

168 Scopus citations

Abstract

One merit of organic-inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to their application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, the phase separation of mixed-halide perovskites caused by light or applied bias results in undesirable recombination at iodide-rich domains, meaning open-circuit voltage (V_OC) pinning in solar cells and infrared emission in LEDs. Here, we report an approach to suppress halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. Using the stable mixed-halide perovskite films, we are able to fabricate efficient and wavelength-tunable perovskite LEDs from infrared to green with high external quantum efficiencies of up to 5%, as well as linearly tuned V_OC from 1.05 to 1.45 V in solar cells.

Original language	English (US)
Pages (from-to)	6863-6869
Number of pages	7
Journal	Nano Letters
Volume	17
Issue number	11
DOIs	https://doi.org/10.1021/acs.nanolett.7b03179
State	Published - Nov 8 2017

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Mechanical Engineering
Bioengineering
General Materials Science

Keywords

LEDs
Mixed-halide perovskite
halide migration
phase separation
solar cells

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10.1021/acs.nanolett.7b03179

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title = "Mixed-Halide Perovskites with Stabilized Bandgaps",

abstract = "One merit of organic-inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to their application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, the phase separation of mixed-halide perovskites caused by light or applied bias results in undesirable recombination at iodide-rich domains, meaning open-circuit voltage (VOC) pinning in solar cells and infrared emission in LEDs. Here, we report an approach to suppress halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. Using the stable mixed-halide perovskite films, we are able to fabricate efficient and wavelength-tunable perovskite LEDs from infrared to green with high external quantum efficiencies of up to 5%, as well as linearly tuned VOC from 1.05 to 1.45 V in solar cells.",

keywords = "LEDs, Mixed-halide perovskite, halide migration, phase separation, solar cells",

author = "Zhengguo Xiao and Lianfeng Zhao and Tran, {Nhu L.} and Lin, {Yunhui Lisa} and Silver, {Scott H.} and Kerner, {Ross A.} and Nan Yao and Antoine Kahn and Scholes, {Gregory D.} and Rand, {Barry P.}",

note = "Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

year = "2017",

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doi = "10.1021/acs.nanolett.7b03179",

language = "English (US)",

volume = "17",

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T1 - Mixed-Halide Perovskites with Stabilized Bandgaps

AU - Xiao, Zhengguo

AU - Zhao, Lianfeng

AU - Tran, Nhu L.

AU - Lin, Yunhui Lisa

AU - Silver, Scott H.

AU - Kerner, Ross A.

AU - Yao, Nan

AU - Kahn, Antoine

AU - Scholes, Gregory D.

AU - Rand, Barry P.

PY - 2017/11/8

Y1 - 2017/11/8

N2 - One merit of organic-inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to their application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, the phase separation of mixed-halide perovskites caused by light or applied bias results in undesirable recombination at iodide-rich domains, meaning open-circuit voltage (VOC) pinning in solar cells and infrared emission in LEDs. Here, we report an approach to suppress halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. Using the stable mixed-halide perovskite films, we are able to fabricate efficient and wavelength-tunable perovskite LEDs from infrared to green with high external quantum efficiencies of up to 5%, as well as linearly tuned VOC from 1.05 to 1.45 V in solar cells.

AB - One merit of organic-inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to their application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, the phase separation of mixed-halide perovskites caused by light or applied bias results in undesirable recombination at iodide-rich domains, meaning open-circuit voltage (VOC) pinning in solar cells and infrared emission in LEDs. Here, we report an approach to suppress halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. Using the stable mixed-halide perovskite films, we are able to fabricate efficient and wavelength-tunable perovskite LEDs from infrared to green with high external quantum efficiencies of up to 5%, as well as linearly tuned VOC from 1.05 to 1.45 V in solar cells.

KW - LEDs

KW - Mixed-halide perovskite

KW - halide migration

KW - phase separation

KW - solar cells

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JO - Nano Letters

JF - Nano Letters

IS - 11

ER -

Mixed-Halide Perovskites with Stabilized Bandgaps

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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