Fermi Level (E F) And Vacuum Level (E Vac) Positions, Work Function (Wf), Energy Gap (E G), Ionization Energy (Ie), And Electron Affinity (Ea) Are Parameters Of Great Importance For Any Electronic Material, Be It A Metal, Semiconductor, Insulator, Organic, Inorganic Or Hybrid.to A Large Extent, These Parameters Are Key Ingredients That Define The Electronic Structure Of All.
Therefore, a is also an energy term. Electrons are, therefore, emitted only if the frequency of the photon is greater than the threshold frequency. The work function corresponds to the minimum amount of energy needed to remove an electron from the metal.
In Practice, The Emitted Photo Electrons Have A Range Of Kinetic Energies.
Where , Ξ½ o is threshold frequency. Consider the electrons in a metal as trapped inside an βenergy wellβ where the energy between the surface and the top of the well is equal to the work function Ο Work required to bring an electron from infinity to.
Suppose That, The Energy Of An Incident Photon Is E And The Work Function Of The Metal Is W.
In metals, work function and ionization energy are the same. Energy is defined as the capacity to do work. The minimum energy required to release a photoelectron from the surface of a material.
The Presence Of Minute Amounts Of
It is important to describe the physical origin of the potential landscape illustrated in the above thought experiment. π = β π β π π g π = β π β π π g π = π + π π g β π g = β π β π π π = β π β π π g β = π + π π g π. Where e is the maximum energy, h is planck's constant and Ο is the work function.
The Work Function Of A Surface Is Strongly Affected By The Condition Of The Surface.
The energy of a photon is the sum of the kinetic energy (of an electron released with the help of the photon) and the work function of the illuminated material. You might have a read of these: Here v0 is the photoelectric threshold frequency of the electromagnetic light rays, w is the work function of the metal body.