作者
Zhaohua Zhu,Chao Zhu,Lei Yang,Qian Chen,Linghai Zhang,Jie Dai,Jiacheng Cao,Shaoyu Zeng,Li Wang,Zhiwei Wang,Wei Zhang,Jusheng Bao,Lijuan Yang,Yang Yang,Bo Chen,Chunyang Yin,Hong Chen,Yang Cao,Hao Gu,Jiaxu Yan,Nana Wang,Guichuan Xing,Hai Li,Xiaoyong Wang,Shaozhou Li,Zheng Liu,Hua Zhang,Lin Wang,Xiao Huang,Wei Huang
摘要
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.