Related Experiment Video
Updated: Jun 22, 2025
11:33
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
9.6K
Charge Transport through Single-Molecule Junctions with σ-Delocalized Systems.
Shintaro Fujii1, Saya Seko2, Taichi Tanaka2
1Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
Journal of the American Chemical Society
|July 3, 2024
Summary
Researchers explored charge transport in single-molecule junctions using sigma-delocalized orbital systems. These novel molecular junctions demonstrate efficient conductivity, offering an alternative to traditional pi-orbital systems for ultrasmall electronic devices.
Area of Science:
- Condensed Matter Physics
- Molecular Electronics
- Materials Science
Background:
- Single-molecule junctions are fundamental models for ultrasmall electronic devices.
- Charge transport in pi-conjugated systems is well-researched, but sigma-delocalized systems remain largely unexplored.
Purpose of the Study:
- To investigate charge transport properties of single-molecule junctions utilizing sigma-delocalized orbital systems.
- To explore the potential of selenium-substituted benzene compounds in molecular electronics.
Main Methods:
- Fabrication of single-molecule junctions using compounds with hexa-selenium-substituted benzene.
- Utilizing the break-junction method to analyze electronic properties.
- Investigating charge transport through sigma-delocalized orbital systems.
Main Results:
- Demonstrated efficient charge transport in single-molecule junctions with sigma-delocalized orbital systems.
- Identified lone-pair interactions of selenium atoms as the source of sigma-delocalization.
- Showcased the potential of these junctions as alternatives to conventional pi-orbital systems.
Conclusions:
- Single-molecule junctions with sigma-delocalized orbital systems exhibit promising charge transport capabilities.
- These findings open new avenues for designing advanced molecular electronic components.
- Selenium-based molecular junctions offer a viable alternative for future electronic applications.
Related Concept Videos
01:21Carrier Transport
421
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
421
01:19Facilitated Transport
11.5K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
11.5K
01:19Contact-dependent Signaling
44.5K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
44.5K
02:45Valence Bond Theory
32.2K
Overview of Valence Bond Theory
32.2K
01:11P-N junction
508
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
508