2023Review of Scientific Instruments

An ultra-high vacuum system for fabricating clean two-dimensional material devices

Shuaifei Guo, Mingyan Luo, Gang Shi, Ning Tian, Zhe Huang, Fangyuan Yang, Liguo Ma, Nai Zhou Wang, Qinzhen Shi, Kailiang Xu, Zihan Xu, Kenji Watanabe, Takashi Taniguchi, Xian Hui Chen, Dawei Shen, Liyuan Zhang, Wei Ruan, Yuanbo Zhang

Review of Scientific Instruments · 94, 013903 (2023)

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DOI 10.1063/5.0110875

**AI thematic illustration**Concept artwork created for this paper.

Introduction

This instrumentation paper integrates exfoliation and assembly of two-dimensional devices under ultrahigh vacuum. Example heterostructures demonstrate a process designed to keep newly formed interfaces clean.

A closer reading

The central result is control over sample history. Nominally identical stacks can differ because of adsorbates trapped during assembly; controlling that step strengthens later comparisons of transport measurements.