POLYCRIYSTALLINE SOLAR CELLS

mewlingfawnΗμιαγωγοί

2 Νοε 2013 (πριν από 3 χρόνια και 5 μήνες)

194 εμφανίσεις

POLYCRIYSTALLINE SILICON

SOLAR CELLS




AHMET KARA


MUHAMMET MUSA SÜLÜ

CONTENTS



WHAT IS SOLAR CELLS


KIND OF SOLAR CELLS


POLYCRISTALLINE SILIKON SOLAR CELLS


ADVANTAGES


DISADVANTAGES


WHAT IS THE SOLAR CELLS ?


Solar
cells (photovoltaic battery), the electrical energy into light
energy from the sun devices. Solar cells are semiconductor materials.
Surfaces, square, rectangular, circular areas are generally formatted
batteries 1 m² and thickness is 0.2 to 0.4 mm
.


The
system works on the basis of photovoltaic solar cells. Light
falling on the batteries voltage creates end. The electricity generated by
the battery, accumulator prepared or directed by the control system and
the direct use of energy will be added or left out there. The control unit
is the brain of the solar cell system. Electricity directly for use at night
or in overcast conditions leaves the control unit.


To
increase the power output of the solar cell is a large number
of solar cells in parallel or series connected. Is mounted on a flat
surface, these batteries are connected. This structure is called Solar
Module or PV module.


Means

of

photovoltaic

solar

cells

convert

light

energy

to

electrical

energy
.

Solar

cells

operate

as

a

semiconductor

diode
.



Cells

in

the

upper

layers

of

the

solar

cell

cracks,

breaks,

and

anti
-
glare

coating

and

safeguards

to

prevent

energy

loss

occurs
.

Under

these

layers

is

located

in

the

N
-
type

and

P
-
type

semiconductor

materials
.

N

and

P

type

semiconductor

material

substances

melt

dopings

on

the

desired

result

of

the

controlled

substances

are

formed
.





Polycrystalline

silicon

solar

cells

are

mostly

used

as

a

semiconductor

material
.





Construction and operation of solar cells is shown
schematically in the adjacent figure.




1) Sunlight falls on the solar cell and is absorbed by the
photovoltaic cells. P
-
type semiconductor material and solar
cell at very electrons
electrons

located in the N
-
type
semiconductor material.




2) Sunlight breaks the P
-
type semiconductor material
electrons.




3) Energy won the right flow of electrons N
-
type
semiconductor material.




4) The one
-
way flow of electrons constant direct current (DC)
creates. Electrons flowing through the circuits for charging
batteries and P
-
type semiconductor material used in different
fields or go back.

KIND OF SOLAR CELLS


Amorphous

S
ilicon

Solar
Cells


Copper

Indium

Gallium

Selenide

Solar
Cells


Crystalline

Silicon

Solar
Cells



Polycrystalline

Silicon


Solar
C
ells



Amorphous

S
ilicon

Solar
cell

Copper

Indium

Gallium

Selenide

Solar
Cells


POLYCRYSTALLINE SILICON

SOLAR CELL




The

first

solar
panels

based

on
polycrystalline

silicon
,
which

also

is
known

as
polysilicon

(p
-
Si)
and

multi
-
crystalline

silicon

(mc
-
Si),

were

introduced

to

the

market in
1981.
Unlike

monocrystalline
-
based

solar
panels
,
polycrystalline

solar
panels

do not
require

the

Czochralski

process
.
Raw

silicon

is
melted

and

poured

into

a
square

mold
,
which

is
cooled

and

cut

into

perfectly

square

wafers
.

ADVANTAGES


The process used to make polycrystalline silicon is
simpler and cost less. This reduces the amount of waste
silicon.


Polycrystalline solar panels tend to have slightly lower
heat tolerance

and therefore

perform slightly worse than
monocrystalline

solar panels in high temperatures. Heat
can affect the performance of solar panels and shorten
their lifespans. However, this effect is minor, and most
homeowners do not need to take it into account.


DISADVANTAGES


The efficiency of polycrystalline
-
based solar panels is
typically 13
-
16%. Because of lower silicon purity,
polycrystalline solar panels are not quite as efficient as
monocrystalline

solar panels.


You need to cover a larger surface to output the same
electrical power as you would with a solar panel made of
monocrystalline

silicon.


Monocrystalline

and thin
-
film solar panels tend to be
more aesthetically pleasing since they have a more
uniform look compared to the speckled blue color of
polycrystalline silicon.



THAKS FOR LISTENING