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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.201904702
|2 doi
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|a pubmed24n1010.xml
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|a eng
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|a Si, Haonan
|e verfasserin
|4 aut
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|a A-Site Management for Highly Crystalline Perovskites
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|c 2020
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|a Text
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 29.01.2020
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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 © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a An in-depth understanding and effective suppression of nonradiative recombination pathways in perovskites are crucial to their crystallization process, in which supersaturation discrepancies at different time scales between CH3 NH3 I (MAI, methylammonium iodide) and PbI2 remain a key issue. Here, an A-site management strategy via the introduction of an A-site placeholder cation, NH4 + , to offset the deficient MA+ precipitation by occupying the cavity of Pb-I framework, is proposed. The temporarily remaining NH4 + is substituted by subsequently precipitated MA+ . The temperature-dependent crystallization process with the generation and consumption of a transient phase is sufficiently demonstrated by the dynamic changes in crystal structure characteristic peaks through in situ grazing-incidence X-ray diffraction and the surface potential difference evolution through temperature-dependent Kelvin probe force microscopy. A highly crystalline perovskite is consequently acquired, indicated by the enlarged grain size, lowered nonradiative defect density, prolonged carrier lifetime, and fluorescence lifetime imaging. Most importantly, it is identified that the A-site IMA defect is responsible for such crystal quality optimization based on theoretical calculations, transient absorption, and deep-level transient spectroscopy. Furthermore, the universality of the proposed A-site management strategy is demonstrated with other mixed-cation perovskite systems, indicating that this methodology successfully provides guidance for synthesis route design of highly crystalline perovskites
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|a Journal Article
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|a A-site management
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|a A-site-related defects
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|a highly crystalline perovskites
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|a placeholder cations
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|a transient phases
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|a Zhang, Zheng
|e verfasserin
|4 aut
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|a Liao, Qingliang
|e verfasserin
|4 aut
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|a Zhang, Guangjie
|e verfasserin
|4 aut
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|a Ou, Yang
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|4 aut
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|a Zhang, Suicai
|e verfasserin
|4 aut
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|a Wu, Hualin
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|4 aut
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|a Wu, Jing
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|a Kang, Zhuo
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|a Zhang, Yue
|e verfasserin
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 4 vom: 23. Jan., Seite e1904702
|w (DE-627)NLM098206397
|x 1521-4095
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|g volume:32
|g year:2020
|g number:4
|g day:23
|g month:01
|g pages:e1904702
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|u http://dx.doi.org/10.1002/adma.201904702
|3 Volltext
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