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

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), Min Ho Park(Seoul National University), Su-Hun Jeong(Seoul National University), Young‐Hoon Kim(Seoul National University), Jinwoo Park(Seoul National University), Emad Oveisi(École Polytechnique Fédérale de Lausanne), 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 M. Jang(Pohang University of Science and Technology), Richard H. Friend(University of Cambridge), Kian Ping Loh(National University of Singapore), Mohammad Khaja Nazeeruddin(École Polytechnique Fédérale de Lausanne), Nam‐Gyu Park(Sungkyunkwan University), Tae‐Woo Lee(Seoul National University)
Nature Communications
July 6, 2020
10.1038/s41467-020-17072-0
Cited by 173Open Access
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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.

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