POLYCRIYSTALLINE SILICONSOLAR 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 Silicon Solar Cells• Copper Indium Gallium Selenide Solar Cells• Crystalline Silicon Solar Cells • Polycrystalline Silicon Solar Cells

Amorphous Silicon 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