Preparation method of heterojunction with controllable torsion angle

By combining spectral measurements with a precision rotating platform, the torsion angle of moiré superlattice materials can be precisely controlled, solving the problems of low preparation efficiency and chemical pollution in existing technologies. This method is applicable to the preparation of heterojunctions of various two-dimensional materials, reducing costs and expanding the scope of applications.

CN122094147APending Publication Date: 2026-05-26BEIJING JIAOTONG UNIV +1
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Patent Information

Application Number
CN202610100480.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing technologies, the twist angle of moiré superlattice materials cannot be actively and precisely controlled, resulting in low preparation efficiency, high cost, and the risk of chemical pollution, making it difficult to promote in ordinary laboratories or industrial environments.

Method used

The lattice orientation of two-dimensional materials is measured by pump-probe time-resolved spectroscopy, a reference orientation is marked, and a precision rotating platform and dry transfer technology are used to achieve precise control and preset of the torsion angle, thus forming a heterojunction.

Benefits of technology

It achieves precise and controllable preparation of torsion angle, improves preparation efficiency and success rate, reduces cost, is suitable for general laboratories and industrialization, produces materials without chemical pollution, is applicable to all two-dimensional materials that can be mechanically exfoliated (hexagonal, orthorhombic, etc. crystal systems), dry transfer, no chemical residue, clean interface, maintains intrinsic physical properties, and the method can be extended to the preparation of multilayer stacked and complex heterostructures.

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Abstract

The invention discloses a preparation method of a heterojunction with a controllable torsion angle, and belongs to the technical field of molar superlattice materials. The method comprises the following steps: firstly, measuring the lattice direction optical response of a two-dimensional material by using an angle-dependent pumping-detection time-resolved spectrum, determining the lattice reference direction of the two-dimensional material, and marking the surface of the two-dimensional material; then, fixing the first marking material on a substrate, placing the second marking material on a precise rotating table, observing through an optical microscope, firstly enabling the marking directions of the two marking materials to be parallel to determine an initial angle, and then precisely rotating the platform to a target angle according to a preset torsion angle; and finally, completing dry transfer and Van der Waals bonding of the material in an angle keeping state to form a heterojunction with a preset torsion angle. According to the method, the fundamental transformation of the torsion angle from passive screening to active design is realized, the control precision is superior to 0.1 degree, the dependence on expensive equipment such as a transmission electron microscope is eliminated, and the method has the advantages of universal process, clean interface and high success rate.
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