Improved Charge Balance in Green Perovskite Light-Emitting Diodes with Atomic-Layer-Deposited Al2O3

William B. Gunnarsson; Zhaojian Xu; Nakita K. Noel; Barry P. Rand

doi:10.1021/acsami.2c00860

Improved Charge Balance in Green Perovskite Light-Emitting Diodes with Atomic-Layer-Deposited Al₂O₃

William B. Gunnarsson, Zhaojian Xu, Nakita K. Noel, Barry P. Rand

Research output: Contribution to journal › Review article › peer-review

Abstract

Perovskite light-emitting diodes (LEDs) have experienced a rapid increase in efficiency over the last several years and are now regarded as promising low-cost devices for displays and communication systems. However, it is often challenging to employ ZnO, a well-studied electron transport material, in perovskite LEDs due to chemical instability at the ZnO/perovskite interface and charge injection imbalance caused by the relatively high conductivity of ZnO. In this work, we address these problems by depositing an ultrathin Al2O3 interlayer at the ZnO/perovskite interface, allowing the fabrication of green-emitting perovskite LEDs with a maximum luminance of 21' »815 cd/m2. Using atomic layer deposition, we can precisely control the Al2O3 thickness and thus fine-tune the electron injection from ZnO, allowing us to enhance the efficiency and operational stability of our LEDs.

Original language	English (US)
Journal	ACS Applied Materials and Interfaces
DOIs	https://doi.org/10.1021/acsami.2c00860
State	Accepted/In press - 2022

All Science Journal Classification (ASJC) codes

Materials Science(all)

Keywords

AlO
atomic layer deposition
charge balance
CsPbBr
LED
metal halide perovskite
ZnO

Access to Document

10.1021/acsami.2c00860

Cite this

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title = "Improved Charge Balance in Green Perovskite Light-Emitting Diodes with Atomic-Layer-Deposited Al2O3",

abstract = "Perovskite light-emitting diodes (LEDs) have experienced a rapid increase in efficiency over the last several years and are now regarded as promising low-cost devices for displays and communication systems. However, it is often challenging to employ ZnO, a well-studied electron transport material, in perovskite LEDs due to chemical instability at the ZnO/perovskite interface and charge injection imbalance caused by the relatively high conductivity of ZnO. In this work, we address these problems by depositing an ultrathin Al2O3 interlayer at the ZnO/perovskite interface, allowing the fabrication of green-emitting perovskite LEDs with a maximum luminance of 21' »815 cd/m2. Using atomic layer deposition, we can precisely control the Al2O3 thickness and thus fine-tune the electron injection from ZnO, allowing us to enhance the efficiency and operational stability of our LEDs.",

keywords = "AlO, atomic layer deposition, charge balance, CsPbBr, LED, metal halide perovskite, ZnO",

author = "Gunnarsson, {William B.} and Zhaojian Xu and Noel, {Nakita K.} and Rand, {Barry P.}",

note = "Funding Information: We thank Jordan Dull for assistance with ellipsometry measurements. We acknowledge support for this work from DARPA Award N66001-20-1-4052. W.B.G. acknowledges support by the National Science Foundation Graduate Research Fellowship Program under Grant DGE-1656466. The authors acknowledge the use of Princeton{\textquoteright}s Imaging and Analysis Center, which is partially supported through the Princeton Center for Complex Materials (PCCM), a National Science Foundation MRSEC program (DMR-2011750). Publisher Copyright: {\textcopyright} 2022 American Chemical Society.",

year = "2022",

doi = "10.1021/acsami.2c00860",

language = "English (US)",

journal = "ACS applied materials & interfaces",

issn = "1944-8244",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Improved Charge Balance in Green Perovskite Light-Emitting Diodes with Atomic-Layer-Deposited Al2O3

AU - Gunnarsson, William B.

AU - Xu, Zhaojian

AU - Noel, Nakita K.

AU - Rand, Barry P.

N1 - Funding Information: We thank Jordan Dull for assistance with ellipsometry measurements. We acknowledge support for this work from DARPA Award N66001-20-1-4052. W.B.G. acknowledges support by the National Science Foundation Graduate Research Fellowship Program under Grant DGE-1656466. The authors acknowledge the use of Princeton’s Imaging and Analysis Center, which is partially supported through the Princeton Center for Complex Materials (PCCM), a National Science Foundation MRSEC program (DMR-2011750). Publisher Copyright: © 2022 American Chemical Society.

PY - 2022

Y1 - 2022

N2 - Perovskite light-emitting diodes (LEDs) have experienced a rapid increase in efficiency over the last several years and are now regarded as promising low-cost devices for displays and communication systems. However, it is often challenging to employ ZnO, a well-studied electron transport material, in perovskite LEDs due to chemical instability at the ZnO/perovskite interface and charge injection imbalance caused by the relatively high conductivity of ZnO. In this work, we address these problems by depositing an ultrathin Al2O3 interlayer at the ZnO/perovskite interface, allowing the fabrication of green-emitting perovskite LEDs with a maximum luminance of 21' »815 cd/m2. Using atomic layer deposition, we can precisely control the Al2O3 thickness and thus fine-tune the electron injection from ZnO, allowing us to enhance the efficiency and operational stability of our LEDs.

AB - Perovskite light-emitting diodes (LEDs) have experienced a rapid increase in efficiency over the last several years and are now regarded as promising low-cost devices for displays and communication systems. However, it is often challenging to employ ZnO, a well-studied electron transport material, in perovskite LEDs due to chemical instability at the ZnO/perovskite interface and charge injection imbalance caused by the relatively high conductivity of ZnO. In this work, we address these problems by depositing an ultrathin Al2O3 interlayer at the ZnO/perovskite interface, allowing the fabrication of green-emitting perovskite LEDs with a maximum luminance of 21' »815 cd/m2. Using atomic layer deposition, we can precisely control the Al2O3 thickness and thus fine-tune the electron injection from ZnO, allowing us to enhance the efficiency and operational stability of our LEDs.

KW - AlO

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KW - charge balance

KW - CsPbBr

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KW - metal halide perovskite

KW - ZnO

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