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A Multifunctional Molecular Modifier Enabling Efficient Large-Area Perovskite Light-Emitting Diodes

49 Pages Posted: 2 Mar 2020 Publication Status: Review Complete

See all articles by Haoran Wang

Haoran Wang

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

Xiwen Gong

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering

Dewei Zhao

Sichuan University - Institute of Solar Energy Materials

Yong-Biao Zhao

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering

Sheng Wang

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

Jianfeng Zhang

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

Lingmei Kong

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

Bin Wei

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

Rafael Quintero-Bermudez

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering

Oleksandr Voznyy

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering

Yuequn Shang

ShanghaiTech University - School of Physical Science and Technology

Zhijun Ning

ShanghaiTech University - School of Physical Science and Technology

Yanfa Yan

University of Toledo - Wright Center for Photovoltaics Innovation and Commercialization

Edward H. Sargent

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering

Xuyong Yang

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

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Abstract

With rapid progress in perovskite light-emitting diodes (PeLEDs), the electroluminescence performance of large-area perovskite devices is increasingly important. We investigate why large-area performance lags behind that achieved in laboratory-scale devices, and found that defects in perovskite films – emerging from thermal convection during solvent evaporation and electronic traps formed during perovskite crystallization – are chief causes. Here we report a molecular modification strategy that simultaneously eliminates pinholes in perovskite layers by controlling the dynamics of film formation, and passivates the defects in perovskites by incorporating Br species, thereby preventing shorts and non-radiative recombination. The molecular modifier 1,3,5-tris (bromomethyl) benzene (TBB) also modulates the electronic structure of injection/transport materials to achieve improved charge injection and balanced charge transport. As a result, we demonstrate a 20 mm × 20 mm green perovskite nanocrystal LED that achieves an external quantum efficiency (EQE) of over 16%, the record efficiency for large-area PeLEDs. Our work opens a route to scaling perovskite LEDs.

Keywords: perovskite, light-emitting diodes, electroluminescence, molecular modifier, scalable fabrication

Suggested Citation

Wang, Haoran and Gong, Xiwen and Zhao, Dewei and Zhao, Yong-Biao and Wang, Sheng and Zhang, Jianfeng and Kong, Lingmei and Wei, Bin and Quintero-Bermudez, Rafael and Voznyy, Oleksandr and Shang, Yuequn and Ning, Zhijun and Yan, Yanfa and Sargent, Edward H. and Yang, Xuyong, A Multifunctional Molecular Modifier Enabling Efficient Large-Area Perovskite Light-Emitting Diodes. Available at SSRN: https://ssrn.com/abstract=3543834 or http://dx.doi.org/10.2139/ssrn.3543834
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Haoran Wang

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

149 Yanchang Road
Shanghai, 200072
China

Xiwen Gong

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering

Toronto
Canada

Dewei Zhao

Sichuan University - Institute of Solar Energy Materials ( email )

24 South Section 1, Yihuan Road
Chengdu, 610065
China

Yong-Biao Zhao

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering ( email )

Toronto
Canada

Sheng Wang

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

149 Yanchang Road
Shanghai, 200072
China

Jianfeng Zhang

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

149 Yanchang Road
Shanghai, 200072
China

Lingmei Kong

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE) ( email )

149 Yanchang Road
Shanghai, 200072
China

Bin Wei

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE)

149 Yanchang Road
Shanghai, 200072
China

Rafael Quintero-Bermudez

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering ( email )

Toronto
Canada

Oleksandr Voznyy

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering ( email )

Toronto
Canada

Yuequn Shang

ShanghaiTech University - School of Physical Science and Technology ( email )

393 Middle Huaxia Road, Pudong
Shanghai, 201210
China

Zhijun Ning

ShanghaiTech University - School of Physical Science and Technology ( email )

393 Middle Huaxia Road, Pudong
Shanghai, 201210
China

Yanfa Yan

University of Toledo - Wright Center for Photovoltaics Innovation and Commercialization ( email )

Toledo, OH
United States

Edward H. Sargent

University of Toronto - The Edward S. Rogers Sr. Department of Electrical and Computer Engineering ( email )

Toronto
Canada

Xuyong Yang (Contact Author)

Shanghai University - Key Laboratory of Advanced Display and System Applications (MOE) ( email )

149 Yanchang Road
Shanghai, 200072
China

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