This video represent complexity of Solar Energy, Photovoltaic System, working principle of Solar Cell and Photoelectric Effect in a simple and understandable way.
From Solar energy through solar panel and solar cell towards home applications powering
Solar Energy (00:08)
Solar energy is the most abundant permanent energy resource on earth and it is available for use in its direct (solar radiation) and indirect forms (wind, biomass, hydro, ocean etc.)
The sun emits energy at a rate of 380 sextilion kW every second
Photoelectric Effect (01:53)
When sun or light shines, it emits particles call photons, this photons are massless, and if photons hits one of the electrons, and if photon has enough energy, it can free the electron, as a matter fact it will knock it loose electron from outer orbit of silicon atom with some velocity and in some direction. This electron become negatively charged free electron called photon electron.
In electronic sheath of silicon atom a hole emerges, and whole atom of silicon become postively charged, because, after photon hits electron, in atom, we have 14 protons and 13 electrons, with simply math there is more protons who are positevly charged.
Solar Cell (04:59)
Solar cell is constructed from this parts N-layer, P-layer, Metallic conductors, Module encapsulate, glass cover, Back Sheet.
Role of Solar cell is to produce electric current from solar energy.
In a process called “doping”, impurity atoms are placed in very pure silicon to change the electrical characteristics of the crystal. Phosphorus can replace some of the silicon atoms in the crystal and when this happens the phosphorus atom is called a dopant
Boron, with five protons and five electrons, can also substitute in a silicon crystal where
a silicon atom would normally reside. Because a boron atom has only three electrons
available in its bonding shell, only three covalent bonds can be formed between a boron
atom and the silicon atoms in a crystal.
P-N Junction (10:27)
P-N Junction or depletion region is made when N-layer and P-layer connect together, and when electrons try to fill holes in entire volume. Most Solar cells are large area of P-N junction
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Create: Hrvoje Čočić
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