HOW DOSE SOLAR POWER WORK??急!!*20分*

How Does Solar Power Work?
A Detailed Overview of Photovoltaics
• Uses photovoltaics to convert sunlight directly into electricity by converting
photons (light particles) into electrons (negatively charged particles)
• Photovoltaic (PV) cells are made of special materials called semiconductors
• Silicon, mixed with other atoms, is currently the most commonly semi-conductive
material
• When light strikes the PV cell, a certain portion of it is absorbed within the
semiconductor material, meaning that the energy of the absorbed light is
transferred to the semiconductor.
• The energy knocks electrons loose, allowing them to flow freely.
• PV cells also all have one or more electric fields that act to force electrons freed
by light absorption to flow in a certain direction, called a current.
• This current, together with the cell's voltage (which is a result of its built-in
electric field or fields), defines the power (or wattage) that the solar cell can
produce.
• In Short, when the sun hits a PV cell it causes the atoms to release their electrons
in a way that produces a direct current (DC) similar to the energy from batteries.

http://en.wikipedia.org/wiki/Solar_power