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The Process Of Crystalline Silicon
Silicon is the second most plentiful material in the Earth's crust apart from oxygen. Silicon utilized in solar cell production is refined to an almost 100% purity. In the photovoltaic process solar cells are utilized to transform light into electricity. Solar cells consist of semiconductor substances like: silicon, gallium, cadmium telluride as well as copper indium diselenide. Among the most common materials used in solar cells is crystalline silicon.
With regards to crystalline silicon solar cells, significantly pure silicon with high crystal quality is needed to make powerful usable solar cells. In the outer shell of a silicon atom it is made up of 4 bonding electrons. To form a steady electron configuration, in the crystal lattice two electrons of nearby atoms from an electron pair bond. By forming a stable bond with 4 neighboring electrons silicon reaches its noble gas configuration with 8 out electrons. This electron bond can be broken by light or heat, which allows the electron to move liberally and consequently it leaves a hole in the crystal lattice. This is referred to as intrinsic conductivity on crystalline silicon.
Intrinsic conductivity cannot be used to generate electrical power. The crystalline silicon can only generate electrical power when impurities (called doping atoms) are brought in into the crystal lattice. These atoms have one electron more (phosphorous) or perhaps one electron less (boron) than crystalline silicon in their outer shell. The phosphorous doping method is referred to as negative doping (n-doping) and the boron doping technique is known as positive doping (p-doping).
In the case of n-doping the electron can move about openly in the crystal subsequently it can transport electrical charge. Alternatively p-doping has a missing bonding electron for every single bonding born atom in the crystal lattice. This permits electrons from crystalline silicon atoms to fill the hole caused by the missing bonding electron, creating a new hole somewhere else. The conduction method dependent on these doping atoms is known as impurity conduction.
If both the p and n-doped semiconductor layers are brought together a p-n junction is built. This junction permits surplus electrons from the n-semiconductor to diffuse into the p-semiconductor layer, consequently creating an area referred to as the space charge region. Positively charged doping atoms remain in the n-region of the transition and negatively charged doping atoms remain in the p-region of the transition area. An electrical field is then generated that is opposed to the movement of the charge carriers, with the outcome that diffusion does not go on indefinitely by means of the crystalline silicon. This p-n semiconductor is what is termed a solar cell. Once the solar cell is subjected to light photons are absorbed by the electrons. This contribution of energy breaks electron bonds.
The released electrons are pulled through the electrical field into the n-region. The openings that are formed migrate in the opposite direction, into the p-region. This process is what is known as the photovoltaic effect - transforming light into electricity through crystalline silicon.
The Process Of Crystalline Silicon
Silicon is the second most abundant element in the Earth's crust besides oxygen. Silicon used in solar cell construction is refined to an almost 100% purity. In the photovoltaic process solar cells are used to convert light into electricity.
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