Nanocrystalline Polymorphic Energy Funnels for Efficient and Stable Perovskite Light-Emitting Diodes

Do Kyoung Lee; Yunseop Shin; Ho Jin Jang; Joo Hong Lee; Keonwoo Park; Woochan Lee; Seunghyup Yoo; Jun Yeob Lee; Dongho Kim; Jin Wook Lee; Nam Gyu Park

doi:10.1021/acsenergylett.1c00565

Nanocrystalline Polymorphic Energy Funnels for Efficient and Stable Perovskite Light-Emitting Diodes

Do Kyoung Lee, Yunseop Shin, Ho Jin Jang, Joo Hong Lee, Keonwoo Park, Woochan Lee, Seunghyup Yoo, Jun Yeob Lee, Dongho Kim, Jin Wook Lee, Nam Gyu Park

Department of Chemistry

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

17 Citations (Scopus)

Abstract

Charge carrier confinement in nanocrystals is an effective route to enhance luminescence efficiency of metal halide perovskites. However, difficulty in handling surface ligands of colloidal perovskite nanocrystals and the defective surface of the processed nanocrystals limit radiative efficiency and the stability of nanocrystalline films. We report a novel approach to fabricate highly luminescent nanocrystalline polymorphic formamidinium lead tri-iodide (FAPbI3) films. The cubic perovskite nanocrystals are formed in situ by kinetic controlled solid-state phase conversion of a hexagonal polymorph. The perovskite nanocrystal surface is benign owing to the remnant polymorph forming a type I heterojunction with the nanocrystal surface, facilitating accelerated radiative recombination with suppressed trapping in the nanocrystals to which ultrafast carrier funneling occurs. This polymorphic energy funnel renders photoluminescence intensity enhanced by a factor of 58 compared to that of conventional bulk-FAPbI3 film. A proof-of-concept light-emitting diode device exhibited superior efficiency and stability in comparison to devices based on the conventional bulk-FAPbI3 film.

Original language	English
Pages (from-to)	1821-1830
Number of pages	10
Journal	ACS Energy Letters
Volume	6
Issue number	5
DOIs	https://doi.org/10.1021/acsenergylett.1c00565
Publication status	Published - 2021 May 14

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MIST) under contract numbers NRF-2020R1F1A1067223, 2012M3A6A7054861 (Global Frontier R&D Program on Center for Multiscale Energy System), 2016M3D1A1027663, and 2016M3D1A1027664 (Future Materials Discovery Program) and by the Material and Component Industrial Future Growth Engine Program (20006476) funded by the Ministry of Trade, Industry & Energy (MOTIE).

Publisher Copyright:
© 2021 American Chemical Society.

All Science Journal Classification (ASJC) codes

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1021/acsenergylett.1c00565

Cite this

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title = "Nanocrystalline Polymorphic Energy Funnels for Efficient and Stable Perovskite Light-Emitting Diodes",

abstract = "Charge carrier confinement in nanocrystals is an effective route to enhance luminescence efficiency of metal halide perovskites. However, difficulty in handling surface ligands of colloidal perovskite nanocrystals and the defective surface of the processed nanocrystals limit radiative efficiency and the stability of nanocrystalline films. We report a novel approach to fabricate highly luminescent nanocrystalline polymorphic formamidinium lead tri-iodide (FAPbI3) films. The cubic perovskite nanocrystals are formed in situ by kinetic controlled solid-state phase conversion of a hexagonal polymorph. The perovskite nanocrystal surface is benign owing to the remnant polymorph forming a type I heterojunction with the nanocrystal surface, facilitating accelerated radiative recombination with suppressed trapping in the nanocrystals to which ultrafast carrier funneling occurs. This polymorphic energy funnel renders photoluminescence intensity enhanced by a factor of 58 compared to that of conventional bulk-FAPbI3 film. A proof-of-concept light-emitting diode device exhibited superior efficiency and stability in comparison to devices based on the conventional bulk-FAPbI3 film.",

author = "Lee, {Do Kyoung} and Yunseop Shin and Jang, {Ho Jin} and Lee, {Joo Hong} and Keonwoo Park and Woochan Lee and Seunghyup Yoo and Lee, {Jun Yeob} and Dongho Kim and Lee, {Jin Wook} and Park, {Nam Gyu}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MIST) under contract numbers NRF-2020R1F1A1067223, 2012M3A6A7054861 (Global Frontier R&D Program on Center for Multiscale Energy System), 2016M3D1A1027663, and 2016M3D1A1027664 (Future Materials Discovery Program) and by the Material and Component Industrial Future Growth Engine Program (20006476) funded by the Ministry of Trade, Industry & Energy (MOTIE). Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",

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AU - Lee, Do Kyoung

AU - Shin, Yunseop

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AU - Lee, Joo Hong

AU - Park, Keonwoo

AU - Lee, Woochan

AU - Yoo, Seunghyup

AU - Lee, Jun Yeob

AU - Kim, Dongho

AU - Lee, Jin Wook

AU - Park, Nam Gyu

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PY - 2021/5/14

Y1 - 2021/5/14

N2 - Charge carrier confinement in nanocrystals is an effective route to enhance luminescence efficiency of metal halide perovskites. However, difficulty in handling surface ligands of colloidal perovskite nanocrystals and the defective surface of the processed nanocrystals limit radiative efficiency and the stability of nanocrystalline films. We report a novel approach to fabricate highly luminescent nanocrystalline polymorphic formamidinium lead tri-iodide (FAPbI3) films. The cubic perovskite nanocrystals are formed in situ by kinetic controlled solid-state phase conversion of a hexagonal polymorph. The perovskite nanocrystal surface is benign owing to the remnant polymorph forming a type I heterojunction with the nanocrystal surface, facilitating accelerated radiative recombination with suppressed trapping in the nanocrystals to which ultrafast carrier funneling occurs. This polymorphic energy funnel renders photoluminescence intensity enhanced by a factor of 58 compared to that of conventional bulk-FAPbI3 film. A proof-of-concept light-emitting diode device exhibited superior efficiency and stability in comparison to devices based on the conventional bulk-FAPbI3 film.

AB - Charge carrier confinement in nanocrystals is an effective route to enhance luminescence efficiency of metal halide perovskites. However, difficulty in handling surface ligands of colloidal perovskite nanocrystals and the defective surface of the processed nanocrystals limit radiative efficiency and the stability of nanocrystalline films. We report a novel approach to fabricate highly luminescent nanocrystalline polymorphic formamidinium lead tri-iodide (FAPbI3) films. The cubic perovskite nanocrystals are formed in situ by kinetic controlled solid-state phase conversion of a hexagonal polymorph. The perovskite nanocrystal surface is benign owing to the remnant polymorph forming a type I heterojunction with the nanocrystal surface, facilitating accelerated radiative recombination with suppressed trapping in the nanocrystals to which ultrafast carrier funneling occurs. This polymorphic energy funnel renders photoluminescence intensity enhanced by a factor of 58 compared to that of conventional bulk-FAPbI3 film. A proof-of-concept light-emitting diode device exhibited superior efficiency and stability in comparison to devices based on the conventional bulk-FAPbI3 film.

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Nanocrystalline Polymorphic Energy Funnels for Efficient and Stable Perovskite Light-Emitting Diodes

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

UN SDGs

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