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Room-temperature epitaxial welding of 3D and 2D perovskites
Nature Materials ( IF 41.2 ) Pub Date : 2022-07-25 , DOI: 10.1038/s41563-022-01311-4
Zhaohua Zhu 1 , Chao Zhu 2, 3 , Lei Yang 1 , Qian Chen 4 , Linghai Zhang 1 , Jie Dai 1 , Jiacheng Cao 4 , Shaoyu Zeng 1 , Zeyi Wang 1 , Zhiwei Wang 1 , Wei Zhang 1 , Jusheng Bao 1 , Lijuan Yang 1 , Yang Yang 1 , Bo Chen 5 , Chunyang Yin 6 , Hong Chen 1 , Yang Cao 1 , Hao Gu 7 , Jiaxu Yan 1 , Nana Wang 1 , Guichuan Xing 7 , Hai Li 1 , Xiaoyong Wang 6 , Shaozhou Li 8 , Zheng Liu 3, 9 , Hua Zhang 5, 10, 11 , Lin Wang 1 , Xiao Huang 1 , Wei Huang 1, 4, 8
Affiliation  

Formation of epitaxial heterostructures via post-growth self-assembly is important in the design and preparation of functional hybrid systems combining unique properties of the constituents. This is particularly attractive for the construction of metal halide perovskite heterostructures, since their conventional solution synthesis usually leads to non-uniformity in composition, crystal phase and dimensionality. Herein, we demonstrate that a series of two-dimensional and three-dimensional perovskites of different composition and crystal phase can form epitaxial heterostructures through a ligand-assisted welding process at room temperature. Using the CsPbBr3/PEA2PbBr4 heterostructure as a demonstration, in addition to the effective charge and energy transfer across the epitaxial interface, localized lattice strain was observed at the interface, which was extended to the top layer of the two-dimensional perovskite, leading to multiple new sub-bandgap emissions at low temperature. Given the versatility of our strategy, unlimited hybrid systems are anticipated, yielding composition-, interface- and/or orientation-dependent properties.



中文翻译:

3D 和 2D 钙钛矿的室温外延焊接

通过生长后自组装形成外延异质结构对于设计和制备结合成分独特性质的功能性混合系统非常重要。这对于金属卤化物钙钛矿异质结构的构建特别有吸引力,因为它们的常规溶液合成通常导致组成、晶相和尺寸的不均匀性。在此,我们证明了一系列不同成分和晶相的二维和三维钙钛矿可以在室温下通过配体辅助焊接工艺形成外延异质结构。使用 CsPbBr 3 /PEA 2 PbBr 4以异质结构为例,除了跨外延界面的有效电荷和能量转移外,在界面处观察到局部晶格应变,该应变延伸到二维钙钛矿的顶层,导致多个新的子带隙发射在低温下。鉴于我们策略的多功能性,预计会有无限的混合系统,产生与成分、界面和/或方向相关的特性。

更新日期:2022-07-26
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