Energy-well band structure for enhanced exciton confinement effect in perovskite light-emitting diodes via spray-coating

Jin Kyoung Park; Jin Hyuck Heo; Hyong Joon Lee; Bong Woo Kim; Sang Woo Park; Ki Ha Hong; Sang Hyuk Im

doi:10.1016/j.jallcom.2023.171499

Energy-well band structure for enhanced exciton confinement effect in perovskite light-emitting diodes via spray-coating

Jin Kyoung Park, Jin Hyuck Heo, Hyong Joon Lee, Bong Woo Kim, Sang Woo Park, Ki Ha Hong, Sang Hyuk Im

Department of Chemical and Biological Engineering

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

6 Citations (Scopus)

Abstract

Perovskites possess bright emission and high color purity, but constructing strong charge confinement is requisite for application in efficient light-emitting diodes. Here, we demonstrate a breakthrough to enhance the exciton confinement effect by introducing a Cs₄PbBr₆ layer on a CsPbBr₃ perovskite film through the spray-coating deposition. The impact of the Cs₄PbBr₆ layer is thoroughly investigated and indicates that the Cs₄PbBr₆ layer results in a confined energy-wall band structure and a stronger exciton binding energy. Accordingly, the CsPbBr₃ film with Cs₄PbBr₆ wall exhibits higher photoluminescence (PL) and electroluminescence (EL) from the perovskite light-emitting diodes (PeLEDs). We further optimize the device architecture in an energy-well band structure by sandwiching the CsPbBr₃ between the Cs₄PbBr₆ buried layer and overlayer. As a result, the PeLED with Cs₄PbBr₆ well exhibits ∼18 nm of full width at half maximum (FWHM) in the emission spectrum, 25,738 cd m⁻² of maximum luminance, 65.94 cd A⁻¹ of maximum current efficiency (CE), 15.08% of maximum external quantum efficiency (EQE).

Original language	English
Article number	171499
Journal	Journal of Alloys and Compounds
Volume	965
DOIs	https://doi.org/10.1016/j.jallcom.2023.171499
Publication status	Published - 2023 Nov 25

Bibliographical note

Funding Information:
† J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science , ICT & Future Planning ( Basic Science Research Program [Grant No. 2021R1A5A6002853 ], [Grant No. 2022R1A2C3004964 ], [Grant No. 2022R1C1C2008126 ], [Grant No. 2022M3H4A1A03074093 ]), (Grant No. 2021R1A2B5B01002312 ). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center . J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040 )

Funding Information:
†J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program [Grant No. 2021R1A5A6002853], [Grant No. 2022R1A2C3004964], [Grant No. 2022R1C1C2008126], [Grant No. 2022M3H4A1A03074093]), (Grant No. 2021R1A2B5B01002312). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center. J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040)

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

Energy-well
Exciton confinement
LED
Perovskite
Spray-coating

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2023.171499

Cite this

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title = "Energy-well band structure for enhanced exciton confinement effect in perovskite light-emitting diodes via spray-coating",

abstract = "Perovskites possess bright emission and high color purity, but constructing strong charge confinement is requisite for application in efficient light-emitting diodes. Here, we demonstrate a breakthrough to enhance the exciton confinement effect by introducing a Cs4PbBr6 layer on a CsPbBr3 perovskite film through the spray-coating deposition. The impact of the Cs4PbBr6 layer is thoroughly investigated and indicates that the Cs4PbBr6 layer results in a confined energy-wall band structure and a stronger exciton binding energy. Accordingly, the CsPbBr3 film with Cs4PbBr6 wall exhibits higher photoluminescence (PL) and electroluminescence (EL) from the perovskite light-emitting diodes (PeLEDs). We further optimize the device architecture in an energy-well band structure by sandwiching the CsPbBr3 between the Cs4PbBr6 buried layer and overlayer. As a result, the PeLED with Cs4PbBr6 well exhibits ∼18 nm of full width at half maximum (FWHM) in the emission spectrum, 25,738 cd m−2 of maximum luminance, 65.94 cd A−1 of maximum current efficiency (CE), 15.08% of maximum external quantum efficiency (EQE).",

keywords = "Energy-well, Exciton confinement, LED, Perovskite, Spray-coating",

author = "Park, {Jin Kyoung} and Heo, {Jin Hyuck} and Lee, {Hyong Joon} and Kim, {Bong Woo} and Park, {Sang Woo} and Hong, {Ki Ha} and Im, {Sang Hyuk}",

note = "Funding Information: † J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science , ICT & Future Planning ( Basic Science Research Program [Grant No. 2021R1A5A6002853 ], [Grant No. 2022R1A2C3004964 ], [Grant No. 2022R1C1C2008126 ], [Grant No. 2022M3H4A1A03074093 ]), (Grant No. 2021R1A2B5B01002312 ). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center . J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040 ) Funding Information: †J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program [Grant No. 2021R1A5A6002853], [Grant No. 2022R1A2C3004964], [Grant No. 2022R1C1C2008126], [Grant No. 2022M3H4A1A03074093]), (Grant No. 2021R1A2B5B01002312). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center. J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040) Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

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day = "25",

doi = "10.1016/j.jallcom.2023.171499",

language = "English",

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T1 - Energy-well band structure for enhanced exciton confinement effect in perovskite light-emitting diodes via spray-coating

AU - Park, Jin Kyoung

AU - Heo, Jin Hyuck

AU - Lee, Hyong Joon

AU - Kim, Bong Woo

AU - Park, Sang Woo

AU - Hong, Ki Ha

AU - Im, Sang Hyuk

N1 - Funding Information: † J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science , ICT & Future Planning ( Basic Science Research Program [Grant No. 2021R1A5A6002853 ], [Grant No. 2022R1A2C3004964 ], [Grant No. 2022R1C1C2008126 ], [Grant No. 2022M3H4A1A03074093 ]), (Grant No. 2021R1A2B5B01002312 ). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center . J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040 ) Funding Information: †J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program [Grant No. 2021R1A5A6002853], [Grant No. 2022R1A2C3004964], [Grant No. 2022R1C1C2008126], [Grant No. 2022M3H4A1A03074093]), (Grant No. 2021R1A2B5B01002312). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center. J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040) Publisher Copyright: © 2023 Elsevier B.V.

PY - 2023/11/25

Y1 - 2023/11/25

N2 - Perovskites possess bright emission and high color purity, but constructing strong charge confinement is requisite for application in efficient light-emitting diodes. Here, we demonstrate a breakthrough to enhance the exciton confinement effect by introducing a Cs4PbBr6 layer on a CsPbBr3 perovskite film through the spray-coating deposition. The impact of the Cs4PbBr6 layer is thoroughly investigated and indicates that the Cs4PbBr6 layer results in a confined energy-wall band structure and a stronger exciton binding energy. Accordingly, the CsPbBr3 film with Cs4PbBr6 wall exhibits higher photoluminescence (PL) and electroluminescence (EL) from the perovskite light-emitting diodes (PeLEDs). We further optimize the device architecture in an energy-well band structure by sandwiching the CsPbBr3 between the Cs4PbBr6 buried layer and overlayer. As a result, the PeLED with Cs4PbBr6 well exhibits ∼18 nm of full width at half maximum (FWHM) in the emission spectrum, 25,738 cd m−2 of maximum luminance, 65.94 cd A−1 of maximum current efficiency (CE), 15.08% of maximum external quantum efficiency (EQE).

AB - Perovskites possess bright emission and high color purity, but constructing strong charge confinement is requisite for application in efficient light-emitting diodes. Here, we demonstrate a breakthrough to enhance the exciton confinement effect by introducing a Cs4PbBr6 layer on a CsPbBr3 perovskite film through the spray-coating deposition. The impact of the Cs4PbBr6 layer is thoroughly investigated and indicates that the Cs4PbBr6 layer results in a confined energy-wall band structure and a stronger exciton binding energy. Accordingly, the CsPbBr3 film with Cs4PbBr6 wall exhibits higher photoluminescence (PL) and electroluminescence (EL) from the perovskite light-emitting diodes (PeLEDs). We further optimize the device architecture in an energy-well band structure by sandwiching the CsPbBr3 between the Cs4PbBr6 buried layer and overlayer. As a result, the PeLED with Cs4PbBr6 well exhibits ∼18 nm of full width at half maximum (FWHM) in the emission spectrum, 25,738 cd m−2 of maximum luminance, 65.94 cd A−1 of maximum current efficiency (CE), 15.08% of maximum external quantum efficiency (EQE).

KW - Energy-well

KW - Exciton confinement

KW - LED

KW - Perovskite

KW - Spray-coating

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U2 - 10.1016/j.jallcom.2023.171499

DO - 10.1016/j.jallcom.2023.171499

M3 - Article

AN - SCOPUS:85165989331

SN - 0925-8388

VL - 965

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 171499

ER -

Energy-well band structure for enhanced exciton confinement effect in perovskite light-emitting diodes via spray-coating

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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