Author(s): Liu, C (Liu, Can); Li, ZH (Li, Zehui); Qiao, RX (Qiao, Ruixi); Wang, QH (Wang, Qinghe); Zhang, ZB (Zhang, Zhibin); Liu, F (Liu, Fang); Zhou, ZQ (Zhou, Ziqi); Shang, NZ (Shang, Nianze); Fang, HW (Fang, Hongwei); Wang, MX (Wang, Meixiao); Liu, ZK (Liu, Zhongkai); Feng, Z (Feng, Zuo); Cheng, Y (Cheng, Yang); Wu, H (Wu, Heng); Gong, DW (Gong, Dewei); Liu, S (Liu, Song); Zhang, ZS (Zhang, Zhensheng); Zou, DX (Zou, Dingxin); Fu, Y (Fu, Ying); He, J (He, Jun); Hong, H (Hong, Hao); Wu, MH (Wu, Muhong); Gao, P (Gao, Peng); Tan, PH (Tan, Ping-Heng); Wang, XQ (Wang, Xinqiang); Yu, DP (Yu, Dapeng); Wang, EG (Wang, Enge); Wang, ZJ (Wang, Zhu-Jun); Liu, KH (Liu, Kaihui)

Source: NATURE MATERIALS DOI: 10.1038/s41563-022-01361-8 Early Access Date: SEP 2022

Abstract: The production of large-area twisted bilayer graphene (TBG) with controllable angles is a prerequisite for proceeding with its massive applications. However, most of the prevailing strategies to fabricate twisted bilayers face great challenges, where the transfer methods are easily stuck by interfacial contamination, and direct growth methods lack the flexibility in twist-angle design. Here we develop an effective strategy to grow centimetre-scale TBG with arbitrary twist angles (accuracy, <1.0 degrees). The success in accurate angle control is realized by an angle replication from two prerotated single-crystal Cu(111) foils to form a Cu/TBG/Cu sandwich structure, from which the TBG can be isolated by a custom-developed equipotential surface etching process. The accuracy and consistency of the twist angles are unambiguously illustrated by comprehensive characterization techniques, namely, optical spectroscopy, electron microscopy, photoemission spectroscopy and photocurrent spectroscopy. Our work opens an accessible avenue for the designed growth of large-scale two-dimensional twisted bilayers and thus lays the material foundation for the future applications of twistronics at the integration level.

Angle tunability in twisted bilayer graphene is crucial in promoting its applications of twistronics. Here an angle replication strategy is developed to obtain centimetre-scale bilayer graphene with arbitrary twist angles.

Accession Number: WOS:000854745400004

PubMed ID: 36109673

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Wang, Zhu-Jun                  0000-0002-8227-7323

ISSN: 1476-1122

eISSN: 1476-4660

Full Text: https://www.nature.com/articles/s41563-022-01361-8