What is Unit Cell?
admin The smallest part of a crystal is called as unit cell. It is formed by combination of atoms and molecules. The whole crystal structure can be formed by the repetition…
2025
What are Crystallographic Systems?
Depending upon the shape of the unit cells, the grouping of the crystals is done in seven systems known as crystallographic systems. Type Lattice Constants Example Cubic a=b=c Ag, Li,…
Explain the three basic types of crystals?
Three basic types of crystals are: 1. Single Crystals 2. Poly Crystals 3. Liquid Crystals 1. Single Crystals: Those crystals in which patterns are regular throughout the whole crystal are…
Explain the Different Energy Bands of Solids?
To study the energy bands of the solids first we have to the study the Bohr’s atomic theory. According to Bohr’s theory the energy in different atoms vary with the…
What is the difference between the forbidden, conduction and valence band?
Valence Energy band: In this energy band there are large no of free electrons available. Filling of the valence band can be partial or complete. These bands never get empty.…
How hole formations took place in the crystal structure of semiconductors?
To clarify this concept, let’s consider the crystal structure of any of the semiconductor. Now lets take the example of germanium crystal. In germanium crystal covalent bonding is present between…
Explain the phenomenon of electrical conduction in semi conductors?
The cause of electrical conduction in semiconductors is due to the movement of the holes in the valence band and the movement of the electrons in the conduction band. When…
What are Intrinsic Semiconductors?
Those semi conductors in which impurities are missing are known as intrinsic semiconductors. The electrical conductivity of the semiconductor depends upon the total no of electrons shifted to the conduction…
What are Point Defect in Crystals?
Point defect means missing of the atoms in the crystal, from the lattice site. In a crystal atoms all the ions, atoms, and molecules are perfectly arranged in a three…
What is Doping?
Doping is the process of adding some impurity atoms in the semi conductor. These impurity atoms are known as dopants. After addition of these dopants some of the properties of…