The solar cell is a type of cell that transforms the light energy into electricity. The principle of solar cell is like photovoltaic action. This type of action occurs in all semiconductors, which are basically formed to absorb the light energies.
The basic solar cell consists of a P-type and an N-type semiconductor material (usually silicon or selenium), which consists of a PN joints/junction. The bottom layer is covered with a conducive contact's cover. The bottom layer is away from the light, i.e the light does not reach the bottom. Most of the upper surface area is open so that maximum light can fall and a small contact is placed on the top edge. The P-Type Surface layer is very thin (0.5mm) so that the light can reach the junction.
Although silicon is usually used to create solar cells. Apart from this, P-type junction is sometimes done by the type of p-type selenium. When the light is falling on the solar cell, then the PN nucleus of the solar cell is energized, the pair is formed in the electron hole, which is near the junction.Through the creation of positive and negative ions, an electric field is created near the PN junction, which develops a potential in the horizon of the junction. By the electric field many electron comes through the junction. If the intensity of light is increased, then the movement of carrier will carry more. The current flowing through the junction is proportional to the intensity of light.
Terminal voltage of cells is proportional to the intensity of direct light. Depending on external load, cell voltage may be up to a maximum of 0.6 volt. If many cells are arranged in an array, then more electric voltage can be achieved.When the cells are arranged in series or parallel, just like the battery works. If 10 cells are connected in series, each cell produces 0.5 volt in 150 mA, then the total will be 5 volt. Two parallel solar banks can provide 5 Volt at 300mA.
Although silicon is usually used to create solar cells. Apart from this, P-type junction is sometimes done by the type of p-type selenium. When the light is falling on the solar cell, then the PN nucleus of the solar cell is energized, the pair is formed in the electron hole, which is near the junction.Through the creation of positive and negative ions, an electric field is created near the PN junction, which develops a potential in the horizon of the junction. By the electric field many electron comes through the junction. If the intensity of light is increased, then the movement of carrier will carry more. The current flowing through the junction is proportional to the intensity of light.
Terminal voltage of cells is proportional to the intensity of direct light. Depending on external load, cell voltage may be up to a maximum of 0.6 volt. If many cells are arranged in an array, then more electric voltage can be achieved.When the cells are arranged in series or parallel, just like the battery works. If 10 cells are connected in series, each cell produces 0.5 volt in 150 mA, then the total will be 5 volt. Two parallel solar banks can provide 5 Volt at 300mA.
Solar Cell Uses:
- In Solar Energy Converter
- For the recharge of the battery of the board satellite
- Solar cells are used for driving
- Light measurements
- Light detection circuits.
0 on: "Solar Cell"