Electrical Contact Formation
Electrical Contact Formation - Related Videos
08:12
Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Cited by 10 •
2015
We describe the approaches for the device fabrication and electrical characterization of molybdenum diselenide (MoSe2) layer semiconductor nanostructures with different thicknesses. In addition, the fabrication of ohmic contacts for MoSe2-layer nanocrystals by the focused-ion beam deposition method using platinum (Pt) as a contact metal is described.
04:53
Electrical Safety
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2023
Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Among the many hazards present in the laboratory, electrical hazards are one of the most common we must be cognizant of since most of the laboratory equipment we use requires electricity for operation. Improper handling or operation of electrical devices might lead to electric shock with the potential risk of injury or even death. Electric sparks can lead to fire or explosion (since many flammable...
04:46
Changing the Direction and Orientation of Electric Field During Electric Pulses Application Improves Plasmid Gene Transfer in vitro
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Cited by 2 •
2011
Gene transfection by electroporation is improved approximately two times when orientation of electric field is changed during pulse application, while cell viability is not affected. The increase in gene transfection is caused by the increase of the membrane area which is made competent for DNA entry into the cell.
01:13
Contact Angle
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2023
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces. The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
06:50
Electric Potential
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Electric potential, also known as "voltage", measures the electric potential energy per unit charge. Electric field is a scalar quantity and is fundamental to many electrical effects. Like potential energy, what is physically meaningful is the difference in the electric potential. For example, the spatial variation in the electric potential is related to the electric...
FAQs
The visible surfaces of two components do not touch across their entire apparent area. Instead, microscopic asperities, or surface high points, carry the applied load and create localized conducting paths. These small regions determine the real metal-to-metal contact area, so their deformation and distribution strongly influence contact resistance, current transfer, and the risk of localized heating.
Applied force increases the real contact area by pressing surface asperities together and deforming them. This deformation can create more continuous metal-to-metal pathways across the junction, which lowers contact resistance. Force therefore affects whether a connection remains electrically stable, particularly when the design must tolerate vibration, repeated cycling, or changing environmental conditions.
Oxide films can interrupt direct metal-to-metal conduction at contacting surfaces. During Electrical Contact Formation, sufficient mechanical action may disrupt or displace these insulating layers, allowing conductive regions to develop. The resulting change in the interface helps reduce contact resistance and supports more reliable current transfer, although the contact must also limit excessive localized heating and wear.
Vibration, repeated cycling, and changing environmental conditions can challenge the stability of an electrical contact. These factors may alter how asperities remain engaged, how surface films are displaced, or how wear develops at the interface. Engineering designs account for these conditions because unstable contact can degrade signal integrity and produce less consistent electrical performance.
Engineers apply these principles when designing switches, connectors, relays, sensors, and microelectronic devices. In each case, the interface must provide dependable current transfer while managing resistance, localized heating, and wear. Understanding how force, surface deformation, and insulating films affect the junction helps designers support stable operation across different device functions and service conditions.
An effective interface maintains low and stable contact resistance while preserving signal integrity during operation. It should also limit localized heating and wear rather than allowing these effects to undermine the junction. For engineering applications, the important outcome is dependable electrical behavior that persists through vibration, repeated cycling, and environmental changes relevant to the device.