Vertically grown ultrathin Bi₂SiO₅ as high-κ single-crystalline gate dielectric.

ABSTRACT: Single-crystalline high-κ dielectric materials are desired for the development of future two-dimensional (2D) electronic devices. However, curent 2D gate insulators still face challenges, such as insufficient dielectric constant and difficult to obtain free-standing and transferrable ultrathin films. Here, we demonstrate that ultrathin Bi₂SiO₅ crystals grown by chemical vapor deposition (CVD) can serve as excellent gate dielectric layers for 2D semiconductors, showing a high dielectric constant (>30) and large band gap (~3.8 eV). Unlike other 2D insulators synthesized via in-plane CVD on substrates, vertically grown Bi₂SiO₅ can be easily transferred onto other substrates by polymer-free mechanical pressing, which greatly facilitates its ideal van

SUBMITTER: Chen J 

PROVIDER: S-EPMC10361963 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature