How Pv Cells Turn Sun Energy into Solar Power
The pv cells themselves are created from a special type of material referred to as semiconductor. Silicon is in most cases used. When light strikes this element, the semiconductor takes in a fraction of the energy.
The incoming energy is quite enough to push some electrons loose. These free-floating electrons move in similar course in the semiconductor. This produces an electrical current. The next thing is by using contacts which were positioned on the pv cells and run a circuit from the top contacts, through the item to be powered, and back to the lower contacts.
The silicon is, surprisingly, impure. This is simply because silicon in its natural crystalline state doesn't accommodate much activity of electrons. Every one of the silicon atoms is unstable by itself since there are 4 places for electrons that can be filled. Yet, every silicon atom is in most cases locked up with the other silicon atoms by sharing electrons on the outer balance.
A procedure also known as doping or mixing is essential for the silicon material to be more conductive. It is being dope or blend with another element. Phosporous is used to generate an N-type silicon. N-type silicon has five electrons in its outer ring, so if it mates up with the silicon atoms surrounding it, there's one free electron each phosphorous atom.
On one hand, P-type silicon is produced by doping silicon with baron. P-type silicon only has three electrons in its outer shell leaving a hole for an electron to jump in for every atom of baron. The key to using silicon in pv cells is by using both type of silicon, the N-type and P-type.
The two types of silicon are put in place side by side. At first, the electrons and holes nearby the shared border fill in promptly. Then, equilibrium is achieved where the electrons can no longer interact in that way.
Between the 2 types of silicon, an electric field is developed separating the two halves. Within this field, electrons flows easily via the P-side towards the N-side. On one hand, electrons from N-side could not make it over to the P-side which creates a one-way flow of electrons.
Photons are units of energy from the sunlight. With never ending bumping in the atoms of the solar cells, photons keep the energy moving, freeing electrons and holes. Electric current is then established by the activity of electrons from hole to hole. The field created at the site of the N-type and P-type silicon junction helps to make the voltage that concludes the power picture.
Making use of the sun's energy by using pv cells is still fairly new. The cells are being used in more and more applications, both commercial and residential. Understanding the basics and usage of pv cells is easy for individuals that invest time to find out about them. The use of pv cells puts solar powered energy within reach.
Michael Porterfield is a certified writer who is skilled in renewable energy, thermodynamics, solar panels and also other advanced sources of energy for a better lifestyle. Check out Solar Power Energy, Alternative Energy Source