2D Integrated Solids and Hybrid Bilayer Crystals

Two dimensional (2D) electron transport has been one of the most important topics in science and technology for decades. 2D van der Waals (vdW) crystals offer new methods for building fully integrated 3D solids that confine and contral electron transport in all three dimensions with nanoscale precision. In this talk, I will start with the large-scale processes for generating 2D crystalline semiconductor films and superlattices that could be used to fabricate 2D integrated solids. Then we will discuss exciting new directions, where we combine large scale 2D molecular crystals with vdW monolayers to form 1-nm thick hybrid bilayer crystals with unprecedented properties. First, they generate interlayer potentials and anisotropic hybridized excitons that are tuned by the molecular building blocks. Second, they display conductor-to-insulator transition deep inside of the conduction band caused by the massive interlayer charge transfer aided by molecule to ion coupling.