Zhu Zhaohua, Zhu Chao, Yang Lei, Chen Qian, Zhang Linghai, Dai Jie, Cao Jiacheng, Zeng Shaoyu, Wang Zeyi, Wang Zhiwei, Zhang Wei, Bao Jusheng, Yang Lijuan, Yang Yang, Chen Bo, Yin Chunyang, Chen Hong, Cao Yang, Gu Hao, Yan Jiaxu, Wang Nana, Xing Guichuan, Li Hai, Wang Xiaoyong, Li Shaozhou, Liu Zheng, Zhang Hua, Wang Lin, Huang Xiao, Huang Wei
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing, China.
SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing, China.
Nat Mater. 2022 Sep;21(9):1042-1049. doi: 10.1038/s41563-022-01311-4. Epub 2022 Jul 25.
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 CsPbBr/PEAPbBr 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.
通过生长后自组装形成外延异质结构对于结合成分独特性质的功能混合系统的设计和制备至关重要。这对于金属卤化物钙钛矿异质结构的构建特别有吸引力，因为它们传统的溶液合成通常会导致成分、晶相和维度的不均匀性。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过程形成外延异质结构。以CsPbBr/PEAPbBr异质结构为例，除了在外延界面上有效的电荷和能量转移外，在界面处还观察到局部晶格应变，该应变扩展到二维钙钛矿的顶层，导致在低温下出现多个新的亚带隙发射。鉴于我们策略的通用性，预计会有无限的混合系统，产生依赖于成分、界面和/或取向的性质。
