Solar cell is a PN junction diode, which converts Solar energy into electrical energy. Its symbol is- Construction It consist of silicons or Gallium-Arsenide PN junction diode packed in a glass window on the top. The n-region has small thickness and p-region has large thickness. n-region made thin, So that light falling on the solar […]
NCERT 12th Physics Chapter-14
A photodiode is a special type of junction diode used for convert light energy into electrical energy or detecting optical signals. It is a reverse biased PN junction made from a photosensitive materials. In photodiode, current careers are generated by photons through photo excitation. Its symbol is- Construction Photo diode fabricated with a transparent cover
It is heavily dopped PN junction diode which converts electrical energy into light energy. This diode emits spontaneous radiation under forward biasing. Its symbol is- Working When PN junction is forward biased, electrons and holes move toward opposite sides of the junction through it. Therefore, there are excess minority careers on the either side of
Semiconductor diode in which carriers are generated by photons i.e photo excitation, such devices are known as optoelectronic devices. These devices are- (I) Light Emitting Diode (LED) (II) Photodiode (III) Solar Cell Also Read: CBSE Class 12 Physics Chapter-14 (Semiconductor and Electronic Devices) All Topics
Special Purpose P-N Junction Diode (Zener Diode) A Junction diode specially designed to operate only in the reverse breakdown region continuously without getting damaged is called zener diode. Zener diode with different breakdown voltages can be obtained by changing the doping concentrations of p and n side which in terms change the width of depletion
The graphical relation between voltage applied across PN junction and current flowing through the junction are called I-V characteristics of junction diode.
A semiconductor diode is basically a P-N junction diode with metallic contact provided at the ends for the application of an external voltage. It is a two terminal device.