What is Schottky barrier lowering?
What is Schottky barrier lowering?
This effect is due to a phenomenon called the Schottky barrier lowering, and the Schottky barrier lowering is due to the fact that the presence of metal or good conductor modifies the electric field near the surface of metal.
How do you calculate Schottky barrier height?
Barrier heights determined from room temperature Is, using A⁎=41.1Acm−2K−2, were 1.62, 1.50, 1.29, and 1.53eV for Au, Ni, Pd, and Pt, respectively.
Why Schottky barrier is formed?
For the Schottky barrier, a space charge region (SCR) is formed below the metal electrode due to the depletion of free electrons near the metal. Thus, a built-in electric field across the metal-semiconductor junction is formed, causing an upward bending of the energy bands toward the surface.
What is Schottky effect in semiconductor?
Schottky effect, increase in the discharge of electrons from the surface of a heated material by application of an electric field that reduces the value of the energy required for electron emission. The effect is named after its discoverer, the German physicist Walter Schottky.
What is the use of Schottky barrier diode?
Schottky diodes are used for their low turn-on voltage, fast recovery time and low-loss energy at higher frequencies. These characteristics make Schottky diodes capable of rectifying a current by facilitating a quick transition from conducting to blocking state.
How does the Schottky barrier lowering effect work?
However, in reality, you will find that the barrier height does change a little bit as a function of your applied voltage, and this effect is called the Schottky barrier lowering.
What is the barrier height of a schottky contact?
So, the barrier height for a Schottky contact is defined as the difference, if you recall, between the semiconductor electron affinity and the metal work function.
When does the Schottky effect need to be considered?
Tunneling current is important when large doping concentration in the semiconductor region is considered. Schottky effect or image force induced lowering of the barrier height should be included as well when there is large doping concentration.
How is Fermi level pinning related to Schottky barrier height?
A term, “Fermi level pinning”, has often been used to describe the insensitivity of the experimental Schottky barrier height to the metal work function Fig. 4:Si Schottky barrier height and the prediction by Schottky model (SBH = workfunction of metal – Fermi level of Si.).