Movable-Type Transfer and Stacking of van der Waals Heterostructures for Spintronics
Yuan Cao,
Xinhe Wang,
Xiaoyang Lin,
Wei Yang,
Chen Lv,
Yuan Lu,
Youguang Zhang,
Weisheng Zhao
Affiliations
Yuan Cao
Fert Beijing Research Institute, School of Microelectronics and Beijing Advanced Innovation Centre for Big Data and Brain Computing (BDBC), Beihang University, Beijing, China
Fert Beijing Research Institute, School of Microelectronics and Beijing Advanced Innovation Centre for Big Data and Brain Computing (BDBC), Beihang University, Beijing, China
Fert Beijing Research Institute, School of Microelectronics and Beijing Advanced Innovation Centre for Big Data and Brain Computing (BDBC), Beihang University, Beijing, China
Wei Yang
Fert Beijing Research Institute, School of Microelectronics and Beijing Advanced Innovation Centre for Big Data and Brain Computing (BDBC), Beihang University, Beijing, China
Chen Lv
Fert Beijing Research Institute, School of Microelectronics and Beijing Advanced Innovation Centre for Big Data and Brain Computing (BDBC), Beihang University, Beijing, China
Yuan Lu
Institut Jean Lamour, UMR 7198, CNRS-Universite de Lorraine, Nancy, France
Youguang Zhang
Fert Beijing Research Institute, School of Microelectronics and Beijing Advanced Innovation Centre for Big Data and Brain Computing (BDBC), Beihang University, Beijing, China
Fert Beijing Research Institute, School of Microelectronics and Beijing Advanced Innovation Centre for Big Data and Brain Computing (BDBC), Beihang University, Beijing, China
The key to achieving high-quality and practical van der Waals heterostructure devices made from various two-dimensional (2D) materials lies in the efficient control over clean and flexible interfaces. Inspired by the “movable-type printing”, one of the four great inventions of ancient China, we demonstrate the “movable-type” transfer and stacking of 2D materials, which utilizes prefabricated polyvinyl alcohol (PVA) film to engineer the interfacial adhesion to 2D materials, and provides a flexible, efficient and batchable transfer scheme for 2D materials. The experiments also verify the “movable-type” transfer can preciously control the position and orientation of 2D materials, which meets the burgeoning requirements such as the preparation of twisted graphene and other heterostructures. Importantly, water-solubility of PVA film ensures an ideal interface of the materials without introducing contamination. We illustrate the superiority of this method with a WSe2 vertical spin valve device, whose performance verifies the applicability and advantages of such a method for spintronics. Our PVA-assisted “movable-type” transfer process may promote the development of high-performance 2D-material-based devices.
