Transcript How Do Solar Cells Work

How Do
Solar Cells
Work
Aaron
Culler
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
PV Cells
• PV Cells stand
for Photovoltaic
•Photo=Light
Voltaic=Energy
PV Cell
• Made of Silicon
• Absorbed photons
let electrons flow
freely which make
electrical current =
electricity
• Current with cells
voltage = Power
• PV cells have
more electrical
fields
•These currents
are used to power
calculators,
houses, and etc.
PV Cells
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.
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
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
Technology
• Process of adding impurities
to a Solar cells is called
doping.
• Silicon + Phosphorous = NType
• Boron is added to N type
silicon for better conductor
•Result of adding
boron is P type cell
•P type Positive
•N type Negative
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.
Technology
• This process creates
an electrical current.
• When light is
absorbed into
the solar cell
the electrons
are knocked
loss the try to
find a hole on
the P type
side.
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.