Affiliation:
1. School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China
2. MOE Key Laboratory of Micro‐Systems and Micro‐Structures Manufacturing Harbin Institute of Technology Harbin 150080 China
3. Sauvage Laboratory for Smart Materials School of Materials Science and Engineering Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China
Abstract
AbstractElectric double layer (EDL) devices based on 2D materials have made great achievements for versatile electronic and opto‐electronic applications; however, the ion dynamics and electric field distribution of the EDL at the electrolyte/2D material interface and their influence on the physical properties of 2D materials have not been clearly clarified. In this work, by using Kelvin probe force microscope and steady/transient optical techniques, the character of the EDL and its influence on the optical properties of monolayer transition metal dichalcogenides (TMDs) are probed. The potential drop, unscreened EDL potential distribution, and accumulated carriers at the electrolyte/TMD interface are revealed, which can be explained by nonlinear Thomas–Fermi theory. By monitoring the potential distribution along the channel, the evolution of the electric field‐induced lateral junction in the TMD EDL transistor is accessed, giving rise to the better exploration of EDL device physics. More importantly, EDL gate‐dependent carrier recombination and exciton–exciton annihilation in monolayer TMDs on lithium‐ion solid state electrolyte (Li2Al2SiP2TiO13) are evaluated for the first time, benefiting from the understanding of the interaction between ions, carriers, and excitons. The work will deepen the understanding of the EDL for the exploitation of functional device applications.
Funder
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry