Programming heterophase structure in two-dimensional palladium telluride by reaction diffusion
Abstract
Two-dimensional heterophase structures integrate distinct crystalline phases to enable novel electronic and quantum functionalities through atomic-scale interfaces, yet their controlled synthesis remains challenging due to difficulties in stabilizing metastable phases and achieving atomically defined interfaces. Here, we presented a reaction-diffusion-based approach for the spatially controlled fabrication of Pd–Te heterostructures with tailored phase compositions. By designing a vertical Pd/Te architecture and precisely regulating the Pd:Te ratio, we suppressed undesired in-plane diffusion and achieved selective phase formation through solid-state reactions. By employing an in situ optical-monitoring chemical vapor deposition strategy and subsequently characterizing the samples by aberration-corrected scanning transmission electron microscopy after the reaction, we revealed that interfacial diffusion—driven by local stoichiometric deviations—triggered phase transformations and interface migration. This process was quantitatively described via Fick's law. We demonstrated the synthesis of patterned heterophase structures with atomically sharp interfaces and diverse geometries. Our work elucidates the complex diffusion mechanism and validates reaction diffusion as a novel, feasible strategy for the fabrication of heterophase structures, thereby providing a fresh pathway for advancing phase engineering.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (14)
Mengting Huang
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices
Shuangquan Qu
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices
Ze Hua
Beijing Advanced Innovation Center for Intelligent Robots and Systems and School of Medical Technology
Yiming Ding
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices
Binbin Zhang
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices
Mingzhu Xu
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices
Shibo Wang
Yuanxiao Ma
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices
Yu Zhang
Xiangya Hospital, Central South University Changsha China
Huixia Yang
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices
Shiqi Yang
State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics
Ruiwen Shao
Beijing Advanced Innovation Center for Intelligent Robots and Systems and School of Medical Technology
Xiaolong Xu
Yeliang Wang
School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices