Name the optoelectronic device which convert
optical radiation into electricity ?
Answers
Answer:
The optoelectronic device which converts optical radiation into electricity is PN junction diode. The key feature of a PN diode is that it allows electricity to be transmitted in a unidirectional manner. These kinds of diodes are used in clipping as well as clamping circuits for restoration of Direct Curre
Answer:
Explanation:
PN Diode converts optical radiation into electricity
A PN Diode is a forward biased diode
How a PN Diode is made :-
Two mains things which occur while making PN Diode are Diffusion and Drift
In N type Semiconductor concentration of electrons is greater than the concentration of holes
In P type Semiconductor concentration of holes is greater than the concentration of electrons
During formation holes diffuse from p side to n side ( p → n ) and electrons diffuse from n side to p side ( n → p )
This gives rise to Diffusion Current
Due to diffusion of electrons and holes leave a positive charge is left on the n side and a negative on the p side , this space region is called as Depletion Region ( thickness of depletion region is of the order of one - tenth of a micro meter )
Due to these charges an electron from p side moves to n side and a hole from n side to p side , this motion is called Drift , due to which a Drift Current is produced
Directions of Diffusion Current and Drift Current is opposite
Initially Diffusion Current > Drift Current
As the process continues the electric field strength increases till
Diffusion Current = Drift Current , thus a PN Diode is formed and there's no net current in it