Table of Contents
What is a high work function?
High work-function metals such as Ni, Pt, and Au in the form of multilayer structures, Ni/Au and Ni/Pt/Au, have been investigated as Schottky metallizations on AlGaN/GaN heterostructures under thermal annealing.
What is work function difference?
The energy difference between Fermi energy and vacuum level corresponds to the work function (Φ). The work function corresponds to the minimum amount of energy needed to remove an electron from the metal. In metals, work function and ionization energy are the same.
What do you mean by work function What is its importance?
The work function is the minimum energy (usually measured in electron volts) needed to remove an electron from a solid to a point immediately outside the solid surface (or energy needed to move an electron from the Fermi energy level into vacuum). The work function is an important property of metals.
What does a lower work function mean?
This means it is easier to remove electrons from some metals than others. In turn, this means that the minimum frequency of photon needed to remove an electron from one metal can be lower than for another metal. The smaller the work function the lower the threshold frequency.
What is work function equation?
In equation form, this is given by KEe = hf − BE, where KEe is the maximum kinetic energy of the ejected electron, hf is the photon’s energy, and BE is the binding energy of the electron to the particular material. (BE is sometimes called the work function of the material.)
Which has highest work function value?
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.
Which of the metal has highest work function?
Work Functions for Photoelectric Effect
Element | Work Function(eV) |
---|---|
Potassium | 2.3, 2.29** |
Platinum | 6.35 |
Selenium | 5.11 |
Silver | 4.26-4.73* |
Which metal has the lowest work function?
What is work function and explain with example?
The work function depends on the configurations of atoms at the surface of the material. For example, on polycrystalline silver the work function is 4.26 eV, but on silver crystals it varies for different crystal faces as (100) face: 4.64 eV, (110) face: 4.52 eV, (111) face: 4.74 eV.