What is the work function of nickel?
What is the work function of nickel?
The work function of carefully outgassed nickel was found to be 5.05±0.05 electron volts below 623°K. At this temperature the work function increases becoming 5.20±0.05 electron volts at 1108°K. A work function of 5.24 electron volts was determined thermionically at temperatures of 1150°K and above.
What is metal work function?
The work function (WF) of a metal can be defined as the minimum energy required to extract one electron from a metal. Obviously the WF is one of the fundamental electronic properties of bare and coated metallic surfaces.
What does work function depend on?
Work functions depend on the structure and chemical composition of a surface. For example, different crystallographic surfaces of the same metal or compound can have substantially different work functions. Chemical modifications of a surface can have even larger consequences.
Which elements has highest work function?
The highest known metal work function is approximately 6.35 eV for platinum (Pt) and lowest work function is 2.14eV for cesium. Work function can be said as the minimum energy needed to move an electron from the Fermi level into vacuum.
Why platinum has highest work function?
The mutual depolarization within the adsorbate layer contributes to the eventual work function increase. The anomalous work function change on platinum is large because of the high work function of clean platinum, which favors only a small electron transfer to the halogen adatoms compared with other metals.
Does work function depend on intensity?
To a first approximation the work function is independant of the intensity of the light, because it’s an intrinsic property of the metal. However in practice there may be very small side effects e.g. if the light heats the metal surface this will reduce the work function very slightly.
How are metal silicides used in a circuit?
Electrical connection between the various metal layers is provided by vertical interconnects commonly referred to as vias. See the sidebar for device application details. For metallization of integrated circuit (IC) devices, transition metal silicides, including near-noble and refractory metal silicides, are used.
How are silicides formed in a silicon film?
Prior to the deposition of metal thin films, a 1.5-nm to 2-nm-thick SiO 2 layer was usually present at the silicon substrate surface following the etching of the thermal oxide. It is necessary for the contact metal layers to penetrate the thin oxide layer to react with the silicon to form silicides.
How are metal atoms diffuse across the silicide interface?
In the silicide formation, metal atoms diffuse across the metal/silicide interface, silicon atoms diffuse across the silicide/silicon interface, or both. In order to determine the dominant diffusing species, it is common to introduce an inert marker.
How is a silicide formed in a nanostructured form?
Nanostructured silicide may be formed by depositing ultrathin (∼1 nm) metal film on silicon surfaces. The metal may react with the silicon substrate to form silicide nanodots under appropriate annealing conditions. Ion implantation of metal ions, for example into SiNWs followed by annealing, may also produce silicide nanoparticles.
