Active and non-active large-area metal-molecules-metal junctions.
Barbara Branchi1, Felice C Simeone, Maria A Rampi
1Dipartimento di Chimica, Università di Ferrara, Ferrara, Italy.
Topics in Current Chemistry
|September 29, 2011
Summary
Researchers explore charge transport in organic molecules using molecular junctions for potential molecular electronics. Large-area junctions offer simpler fabrication and greater versatility for applications in organic electronics.
Area of Science:
- Molecular electronics
- Organic electronics
- Charge transport phenomena
Background:
- Molecular junctions are crucial for studying charge transport in organic molecules.
- Interest is driven by potential integration with silicon-based technology.
- Variety of metal-molecule-metal junctions exist for experimental studies.
Purpose of the Study:
- To focus on the fabrication of large-area molecular junctions.
- To summarize and compare experimental results from various junctions.
- To discuss active vs. non-active junctions for different applications.
Main Methods:
- Fabrication of diverse large-area molecular junctions.
- Experimental investigation of charge transport.
- Comparison of results from different junction types and supramolecular systems.
Main Results:
- Large-area molecular junctions offer simpler assembly and higher versatility.
- Parameters crucial for molecular electronics can be extracted from junction studies.
- Results from molecular junctions are complementary to kinetic approaches in supramolecular systems.
Conclusions:
- Large-area molecular junctions are promising for organic electronics.
- Distinction between active and non-active junctions aids practical discussion.
- Further research on molecular junctions can advance molecular electronics.
Related Concept Videos
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
02:32Bonding in Metals
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
02:37Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
01:03Anchoring Junctions
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...