How Do Solar Cells Work

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How Do Solar Cells Work
Aaron Culler
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Intro

• Solar cells Power houses, Calculators, and NASA

space crafts

• Solar revolution Every one gets free energy
• Sun Shines 1000 watts of energy per square meter

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PV Cells

• PV Cells stand for Photovoltaic

• PhotoLight VoltaicEnergy

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PV Cell

• Made of Silicon
• Absorbed photons let electrons flow freely which
  make electrical current electricity
• Current with cells voltage Power

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PV Cells

• PV cells have more electrical fields

• These currents are used to power calculators,
  houses, and etc.

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PV Cells

• The fields force freed light to flow in a
  certain direction to make a current

• This current can be drawn off to be used
  externally.

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Silicon In Solar Cells

• Special properties in crystalline form.
• Atom has 14 electrons in three different shells.

• First shell closest to the center is full
• Outer shell half full with 4 electrons.
• Silicon atoms try to fill up the last shell

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Technology

• Solar Cells very complicated
• Top of Solar cell is glass cover next is
  Transparent adhesive,anti Reflection

• coating, N type semiconductor, P type
  Semiconductor, and then Black Contact

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Technology

• Process of adding impurities to a Solar cells is
  called doping.
• Silicon Phosphorous N- Type
• Boron is added to N type silicon for better
  conductor

• Result of adding boron is P type cell
• P type Positive
• N type Negative

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Technology

• Silicon has 4 shells in the outer shell and
  phosphorous has 5 in the outer shell so these two
  atoms can bond their electrons.

When bonded there is one electron free. Free
Electrons are called free carriers and can carry
an electrical current.
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Technology

• When light is absorbed into the solar cell the
  electrons are knocked loss the try to find a hole
  on the P type side.

• This process creates an electrical current.

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About Me
Hi my name is Aaron Culler. I live in Winston
Salem and in my free time I like to draw and play
basketball.