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LED Lighting | Embeded System | Thermoelectric Modules
LED Lighting | Embeded System | Thermoelectric Modules
>> Products: Solar PV Panel/ How solar panels work.
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NAVIGATION
How solar panels work
It is the principle of Photovoltaic Effect, which refers to photons of light knocking electrons of semiconductors into a higher state of energy to create electricity. The term photovoltaic denotes the unbiased operating mode of a photodiode in which current through the device is entirely due to the transduced light energy. Virtually all photovoltaic devices are some type of photodiode.
<< Construction of the semiconductor used in solar panels: Positive charge is the silicon atom, and the four negative charge are around the silicon atom.
<< When the boron (in Yellow) is mixed into the silicon crystal, there will be a hole (in Blue) between the boron atom and the silicon atom, because each silicon atom is surounded by 4 electrons, while each boron atom only has 3 electons. The hole is very unstable and likely to absorb electrons to keep stability, such seminconductor is named N-type Semiconductor.
<< For the same reason, when the phosphor (in Yellow) is mixed into the silicon crystal, because the phosphor has 5 electrons, 1 electron(in Red) is very active, and such seminconductor is named P-type Semiconductor.
There are many holes in N-type semiconductor, and many electrons in P-type semiconductor, so when they are combined, there is voltage potential in the connection surface, which is called PN junction.
HOLE
ELECTRONS
N-type
P-type
When the solar panels are under the sunlight, holes and electrons are excitated by the photons and start moving, then the electricity is generated.
