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

Kim, H and Kim, JS and Heo, JM and Pei, M and Park, IH and Liu, Z and Yun, HJ and Park, MH and Jeong, SH and Kim, YH and Park, JW and Oveisi, E and Nagane, S and Sadhanala, A and Zhang, L and Kweon, JJ and Lee, SK and Yang, H and Jang, HM and Friend, RH and Loh, KP and Nazeeruddin, MK and Park, NG and Lee, TW (2020) Proton-transfer-induced 3D/2D hybrid perovskites suppress ion migration and reduce luminance overshoot. In: Nature Communications, 11 (1).

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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.

Item Type:	Journal Article
Publication:	Nature Communications
Publisher:	Nature Research
Additional Information:	The dcopyright of this article belongs to Nature Research
Keywords:	benzylamine; methylammonium; perovskite; polystyrenesulfonic acid, Article; channel gating; chemical structure; crystal structure; crystallization; energy dispersive X ray spectroscopy; fluorescence resonance energy transfer; human; hydrogen bond; ion migration; luminance; mathematical model; migration; molecular dynamics; proton nuclear magnetic resonance; quantum mechanics; simulation; thermal analysis; three-dimensional imaging; transmission electron microscopy; two-dimensional imaging; X ray diffraction, Coregonus peled
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	20 Aug 2020 06:27
Last Modified:	20 Aug 2020 06:27
URI:	http://eprints.iisc.ac.in/id/eprint/66037

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