Types, Process | Semiconductor | Optical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
The carrier generation is the process whereby electrons and holes are created. The recombination is the process whereby electrons and holes are annihilated.
Optical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
Electrons and holes can be injected into the conduction and valence band in a number of way. The light incident on the material and the absorption of photons creates electron-hole pairs.
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
In semiconductors, light photons is absorbed in several ways. In intrinsic (pure) semiconductors such as Si, Ge and GaAs, light photons is absorbed to create electron-hole pairs.
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
When light incident on a semiconductor, an electron in the valence band goes to the conduction band. This process generates electron-hole pairs. It is also possible for an electron and a hole to recombine and emit light
Definition, Classifications
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
The optical characteristics of materials are determined by the type of interaction between the electromagnetic radiation and the electrons of the atoms in the material.
2marks, 16marks, Assignment Problems | Physics for Electronics Engineering
Subject and UNIT: Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
Anna University important two mark question with answers, 16marks questions and assignment problems
Physics for Electronics Engineering
Subject and UNIT: Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
Anna university important problems
Definition, Energy band diagram, Construction, Working Principle, VI Characteristics, Applications
Subject and UNIT: Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
An ohmic contact is a type of metal semiconductor junction. It is formed by a contact of a metal with a heavily doped semiconductor.
Definition, Circuit Symbol, Energy band diagram, Construction, Working Principle, VI Characteristics, Advantages, Applications
Subject and UNIT: Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
It is a junction formed between a metal and n-type semiconductor. When the metal has a higher work function than that of n-type semiconductor then the junction formed is called schottky diode. The Fermi level of the semiconductor is higher (since its work function is lower) than the metal.
Types
Subject and UNIT: Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
The device which uses the hall effect for its application is known as Hall device.
Applications
Subject and UNIT: Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
Similar to n-type semiconductor, we can write for p-type semiconductor
Subject and UNIT: Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
The electrical conductivity measurements are not sufficient for the determination of number of charge carriers and their mobilities.