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

Cited 14 time in Web of Science Cited 14 time in Scopus
Authors
Kim, Hobeom; Kim, Joo Sung; Heo, Jung-Min; Pei, Mingyuan; Park, In-Hyeok; Liu, Zhun; Yun, Hyung Joong; Park, Min-Ho; Jeong, Su-Hun; Kim, Young-Hoon; Park, Jin-Woo; Oveisi, Emad; Nagane, Satyawan; Sadhanala, Aditya; Zhang, Lijun; Kweon, Jin Jung; Lee, Sung Keun; Yang, Hoichang; Jang, Hyun Myung; Friend, Richard H.; Loh, Kian Ping; Nazeeruddin, Mohammad Khaja; Park, Nam-Gyu; Lee, Tae-Woo
Issue Date
2020-07
Citation
Nature Communications, Vol.11 No.1, p. 3378
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.
ISSN
2041-1723
URI
https://hdl.handle.net/10371/171784
DOI
https://doi.org/10.1038/s41467-020-17072-0
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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