Design Considerations Of Solar Cell

By

Anish Das

Roll no. -14MS60R16

MATERIALS SCIENCE CENTRE

Indian Institute of Technology

KHARAGPUR, 721302 - INDIA

FEBRUARY,2015107:35:44 PM

Overview

Designing of a solar cell

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Various steps for designing a typical silicon solar cell

Take a p-type single crystalline silicon.

Then dope with thin layer of n-type.

Choose a proper material for making electrodes(for ohmic).

On the top of the cell place finger electrodes.

Series resistance must be low and high shunt resistance.307:35:44 PM

Contd.

Choose a proper antireflection coating material.

Coat the material with proper thickness.

Your cell is ready to illuminate your purpose.

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Process to grow p-type single crystalline silicon wafer

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Schematic of Czochralski technique or C-Z technique

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Contd.

Bulk silicon Cylindrical

Silicon 707:35:45 PM

Contd.

Flat grind Slicing

Is needed to detect the plane

. .

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Chemical etching and polishing

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Si wafers

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Contd.

Width of the wafer ~ 400 to 500 μm1107:35:44 PM

Doping of thin layer of n-type Si

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Choose a proper material for making electrodes

Electrode material must be such that it can easily make ohmic contact i.e. contact resistance must be very low.

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Annealing of the metal-semiconductor junction

Metal-semiconductor junction should be annealed.

Cause when metal-Si junction is annealed then metal silicide is formed which decreases the contact resistance.

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Effect of resistance on solar cell

It reduces the solar cell efficiency. It reduces the fill factor of solar

cell.

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Types of resistance

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Series resistance

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Shunt resistance

Shunt or parallel resistance• Reasons:

It is due to manufacturing fault.

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Contd.

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Antireflection coating material

Now we want that most of the solar radiation should be absorbed by the cell and not reflected back.

So choose a proper dielectric material with proper thickness of coating.

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R.I of coating material

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Thickness of coating material

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Now your solar cell is ready to illuminate your purpose.

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The EndThe End

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Any Question ?Any Question ?

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