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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.201907786
|2 doi
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|a pubmed24n1024.xml
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|a (DE-627)NLM30736237X
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|a (NLM)32147854
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Li, Nan
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Stabilizing Perovskite Light-Emitting Diodes by Incorporation of Binary Alkali Cations
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a The poor stability of perovskite light-emitting diodes (PeLEDs) is a key bottleneck that hinders commercialization of this technology. Here, the degradation process of formamidinium lead iodide (FAPbI3 )-based PeLEDs is carefully investigated and the device stability is improved through binary-alkalication incorporation. Using time-of-flight secondary-ion mass spectrometry, it is found that the degradation of FAPbI3 -based PeLEDs during operation is directly associated with ion migration, and incorporation of binary alkali cations, i.e., Cs+ and Rb+ , in FAPbI3 can suppress ion migration and significantly enhance the lifetime of PeLEDs. Combining experimental and theoretical approaches, it is further revealed that Cs+ and Rb+ ions stabilize the perovskite films by locating at different lattice positions, with Cs+ ions present relatively uniformly throughout the bulk perovskite, while Rb+ ions are found preferentially on the surface and grain boundaries. Further chemical bonding analysis shows that both Cs+ and Rb+ ions raise the net atomic charge of the surrounding I anions, leading to stronger Coulomb interactions between the cations and the inorganic framework. As a result, the Cs+ -Rb+ -incorporated PeLEDs exhibit an external quantum efficiency of 15.84%, the highest among alkali cation-incorporated FAPbI3 devices. More importantly, the PeLEDs show significantly enhanced operation stability, achieving a half-lifetime over 3600 min
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|a Journal Article
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|a alkali cations
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4 |
|a ion migration
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4 |
|a light-emitting diodes
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4 |
|a perovskites
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4 |
|a stability
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| 700 |
1 |
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|a Song, Lei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jia, Yongheng
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Dong, Yifan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Xie, Fangyan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Liduo
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tao, Shuxia
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhao, Ni
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 17 vom: 15. Apr., Seite e1907786
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
1 |
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|g volume:32
|g year:2020
|g number:17
|g day:15
|g month:04
|g pages:e1907786
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| 856 |
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|u http://dx.doi.org/10.1002/adma.201907786
|3 Volltext
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