Proton-transfer-induced 3D/2D hybrid perovskites suppress ion migration and reduce luminance overshoot

Hobeom Kim, Joo Sung Kim, Jung-Min Heo, Mingyuan Pei, In-Hyeok Park, Zhun Liu, Hyung Joong Yun, Min-Ho Park, Su-Hun Jeong, Young-Hoon Kim, Jin-Woo Park, Emad Oveisi, Satyawan Nagane, Aditya Sadhanala, Lijun Zhang, Jin Jung Kweon, Sung Keun Lee, Hoichang Yang, Hyun Myung Jang, Richard H. Friend, Kian Ping Loh, Mohammad Khaja Nazeeruddin, Nam-Gyu Park and Tae-Woo Lee ()
Additional contact information
Hobeom Kim: Seoul National University
Joo Sung Kim: Seoul National University
Jung-Min Heo: Seoul National University
Mingyuan Pei: Inha University
In-Hyeok Park: National University of Singapore
Zhun Liu: Jilin University
Hyung Joong Yun: Korea Basic Science Institute (KBSI)
Min-Ho Park: Seoul National University
Su-Hun Jeong: Seoul National University
Young-Hoon Kim: Seoul National University
Jin-Woo Park: Seoul National University
Emad Oveisi: École Polytechnique Fédérale de Lausanne (EPFL)
Satyawan Nagane: University of Cambridge
Aditya Sadhanala: University of Cambridge
Lijun Zhang: Jilin University
Jin Jung Kweon: Seoul National University
Sung Keun Lee: Seoul National University
Hoichang Yang: Inha University
Hyun Myung Jang: Pohang University of Science and Technology
Richard H. Friend: University of Cambridge
Kian Ping Loh: National University of Singapore
Mohammad Khaja Nazeeruddin: Group for Molecular Engineering of Function Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL)
Nam-Gyu Park: Sungkyunkwan University
Tae-Woo Lee: Seoul National University

Nature Communications, 2020, vol. 11, issue 1, 1-13

Abstract: Abstract Perovskite light-emitting diodes (PeLEDs) based on three-dimensional (3D) polycrystalline perovskites suffer from ion migration, which causes overshoot of luminance over time during operation and reduces its operational lifetime. Here, we demonstrate 3D/2D hybrid PeLEDs with extremely reduced luminance overshoot and 21 times longer operational lifetime than 3D PeLEDs. The luminance overshoot ratio of 3D/2D hybrid PeLED is only 7.4% which is greatly lower than that of 3D PeLED (150.4%). The 3D/2D hybrid perovskite is obtained by adding a small amount of neutral benzylamine to methylammonium lead bromide, which induces a proton transfer from methylammonium to benzylamine and enables crystallization of 2D perovskite without destroying the 3D phase. Benzylammonium in the perovskite lattice suppresses formation of deep-trap states and ion migration, thereby enhances both operating stability and luminous efficiency based on its retardation effect in reorientation.

Date: 2020
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DOI: 10.1038/s41467-020-17072-0

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