What kind of semiconductor is used in Schottky junction?
What kind of semiconductor is used in Schottky junction?
As the name implies, the MS junction is that a metal and a semiconductor material are contacted closely. Basically, there are two types of MS contacts that are widely used in semiconductor devices: Rectifying Schottky Diodes….Conclusion.
| n-type semiconductor | p-type semiconductor | |
|---|---|---|
| ΦM<ΦS | Ohmic | Rectifying |
When a metal is brought into contact with a P type semiconductor and the metal has a lower work function than the semiconductor?
2) If work function of P-type semiconductor is lower than that of a metal it contacts, it means that electrons will flow from semiconductor to metal when no potential is applied and recombination is energetically unfavorable.
What is Schottky diode explain it with the help of energy band diagram?
Energy band diagram of schottky diode The work function is defined as the energy required to move an electron from Fermi level (EF) to vacuum level (E0). The work function is different for metal and semiconductor. So the electrons in the N-type semiconductor have more potential energy than the electrons in the metal.
What is the difference between PN junction and PN Schottky?
In the normal rectifier grade PN junction diode, the junction is formed between P type semiconductor to N type semiconductor. Whereas in Schottky diode the junction is in between N type semiconductor to Metal plate. The schottky barrier diode has electrons as majority carriers on both sides of the junction.
What is the purpose of Schottky diode?
Compared to p-n diodes, a Schottky diode provides lower voltage drop across the diode at low reverse bias. Some applications of Schottky diodes include rectifiers in switching regulators, discharge protection in power electronics, and rectifying circuits requiring high switching rate.
What are the advantages of Schottky diode?
Advantages of Schottky diode :
- High efficiency.
- Fast recovery time so it can be mostly used in the application of high-speed switching.
- Low junction capacitance.
- The low forward voltage drop.
- It can operate high frequency.
- Schottky diode produces less unwanted noise than P-N junction diode.
- High current density.
Which metal is a semiconductor?
Some examples of semiconductors are silicon, germanium, gallium arsenide, and elements near the so-called “metalloid staircase” on the periodic table. After silicon, gallium arsenide is the second-most common semiconductor and is used in laser diodes, solar cells, microwave-frequency integrated circuits, and others.
What is P type semiconductor?
What is a p-type Semiconductor? A p-type semiconductor is an intrinsic semiconductor doped with boron (B) or indium (In). Silicon of Group IV has four valence electrons and boron of Group III has three valence electrons.
What is the purpose of a Schottky diode?
What is a Schottky Rectifier?
The Schottky diode or Schottky Barrier Rectifier is named after the German physicist “Walter H. Schottky”, is a semiconductor diode designed with a metal by the semiconductor junction. It has a low-forward voltage drop and a very rapid switching act. Actually, it is one of the oldest semiconductor devices in reality.
What is the Schottky diode and how it works?
Schottky), also known as Schottky barrier diode or hot-carrier diode, is a semiconductor diode formed by the junction of a semiconductor with a metal. It has a low forward voltage drop and a very fast switching action. When sufficient forward voltage is applied, a current flows in the forward direction.
What is the principle of Schottky diode?
In a Schottky diode, a semiconductor–metal junction is formed between a semiconductor and a metal, thus creating a Schottky barrier. The N-type semiconductor acts as the cathode and the metal side acts as the anode of the diode. This Schottky barrier results in both a low forward voltage drop and very fast switching.
What causes the Schottky diode current across a semiconductor junction?
Schottky diode current The current across a metal-semiconductor junction is mainly due to majority carriers. Three distinctly different mechanisms exist: diffusion of carriers from the semiconductor into the metal, thermionic emission of carriers across the Schottky barrier and quantum-mechanical tunneling through the barrier.
How is the Fermi level formed at a Schottky junction?
Thus, when a Schottky junction is formed between the metal and semicon- ductor, the Fermi level lines up and also a positive potential is formed on the semiconductor side. Because the depletion region extends within a certain depth in the semiconductor there is bending of the energy bands on the semi- conductor side.
How does the Schottky junction improve solar cell efficiency?
The Schottky-junction is an attempt to increase the efficiency of solar cells by introducing an impurity energy level in the band gap. This impurity can absorb more lower energy photons, which improves the power conversion efficiency of the cell.
Can a Schottky barrier be used to characterize a semiconductor?
Schottky barriers can also be used to characterize a semiconductor. In the depletion region of the Schottky barrier, dopants remain ionized and give rise to a “space charge” which in turn give rise to a capacitance of the junction.
