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Unformatted text preview: tricity Doped Silicon: The
heart of a PV cell
Si with ~1 ppm P or As
Electron rich since P, As
have 5 valence electrons,
but only need 4 for bonding.
This leaves one e- free
Si with ~1 ppm B
B has 3 valence
"holes" to be filled.
Electrons diffuse to fill
images from CCMR Educational Programs The workings of
photovoltaics Electrons migrate from n layer to p layer.
Negative charge accumulates at top of p layer.
images from CCMR Educational Programs Generating current from a PV cell Photons kick electrons from one side to another,
generating an electric field.
Photons must have sufficient energy to provide kick.
images from CCMR Educational Programs Add conductors to top & bottom CCMR Educational Programs Assembling a generic PV cell CCMR Educational Programs Making electricity from PV
Utility grid Sun DC PV-array Inverter AC Battery •
• Sunlight is turned into DC voltage/current by PV
Can charge battery (optional)
Inverted into AC
Optionally connect to existing utility grid
AC powers household appliances Large PV installations
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This document was uploaded on 12/05/2013.
- Fall '13