| |
|
|
| |
 |
| Photodiode |
|
 |
| |
| Photodiode is essentially a P-N junction which works on the basis of electric conduction from light. When light falls on such diodes and if the wavelength of the light is such that the energy of the photon is sufficient to break a valence bond, a new hole - electron pairs are created. This increases the number of charge carriers and hence the conductivity increases. This increases the current in the circuits. The junction diode is made of photo - sensitive semiconductor material. It works in reverse bias condition but the applied potential is less than break down voltage when the intensity of light increases, the current also increases and attains a saturation. These photodiodes are used in computers and in films. |
| |
|
|
| |
|
|
| |
|
|
|
|
|
