Explain the phenomenon of electrical conduction in semi conductors?
admin 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…
What Are Extrinsic Semiconductors?
Those semiconductors in which some impurity atoms are embedded are known as extrinsic semiconductors. Extrinsic semi conductors are basically of two types: 1. P-type semi conductors 2. N-type semi conductors…
What is the difference between semiconductors, conductors, and insulators depending upon their energy bands?
Metals are good conductors of electricity. Insulators are bad conductors of electricity. Similarly, semiconductor devices are partial conductors of electricity means their conductivity lies between conductors and insulators. Let’s discuss…
Explain the formation of holes in Semi Conductors?
As we know that the forbidden energy gap in case of semiconductors is very small. At the temperature of zero Kelvin no electron will leave the valence band. So, conduction…
Define adsorption? What is the difference between adsorption and absorption?
Adsorption: The phenomenon of attracting and retaining the molecules of a substance on the surface of a liquid or a solid resulting into a higher concentration of the molecules on…
Distinguish between Physical Adsorption and Chemisorption?
Difference between physical adsorption and chemisorption are as following: PHYSICAL ADSORPTION CHEMISORPTIONS The forces operating in these are weak vander Waal’s forces. The forces operating in these cases are similar…
What do you mean by positive and negative adsorption?
Positive adsorption: In case of adsorption by solids from the solutions, mostly the solute is adsorbed on the surface of the solid adsorbent so that the concentration of solute on…