Related Experiment Video
Updated: Feb 3, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
Resistivity control by the electrochemical removal of dopant atoms from a nanodot
Wataru Hiraya1, Nozomi Mishima, Takaaki Shima
1Graduate School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan. thasega@waseda.jp.
Abstract:
Doping impurity atoms into semiconductor materials changes the resistance of the material. Selecting the atomic species of a dopant and the precise control of the number of dopant atoms in a unit volume can control the resistance to a desired value. The number of dopant atoms is usually controlled when the materials are synthesized. It can also be controlled after synthesizing by injecting dopant atoms using an ion implantation technique. This physical method has now enabled atom by atom implantation at the desired position. Here, we propose an additional technique, based on the electrochemical potential of dopant atoms in a material. The technique enables the dynamic control of the number of dopant atoms through the application of bias to the material. We demonstrate the controlled removal of dopant atoms using Ag2+δS and Ag-doped Ta2O5 as model materials. The change in resistance accompanying the removal of dopant atoms is also observed.
More Related Videos
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
08:31Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope AFM-SECM
Published on: February 10, 2021
Related Concept Videos
What is an Electrochemical Gradient?
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
Atomic Structure
Atomic Mass
Atomic Orbitals
Hybridization of Atomic Orbitals I
The Energies of Atomic Orbitals