Chemical Vapor Deposition of “Stand-On” 2D Single-Crystal Flakes

Abstract

Two-dimensional (2D) superconductors are highly valued for their reduced dimensionality and unique quantum properties. However, their susceptibility to oxidation and degradation, particularly during wet transfer processes, often leads to undesirable deterioration of their electrical properties. In this work, we present an innovative and facile synthesis strategy for producing ultrathin “stand-on” superconducting FeTe_1–xSe_x nanosheets, enabling a highly efficient and damage-free transfer process. Low-temperature transport measurements confirm the superior superconducting performance of the transferred materials. Furthermore, by employing a convenient dry poly(dimethylsiloxane) (PDMS) stamping technique, we successfully fabricated high-quality 2D superlattices with precise angle control. Moreover, this synthesis strategy has been extended to various substrate and material systems, providing a versatile platform for studying high-performance integrated systems.