Knee Sleeves Guide

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Presentation on solar cells

• Raja Khurram Shahzad

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overview

• Introduction
• Solar cells
• Basic physics of solar cells
• Types of solar cells
• Photovoltaic effect
• Advantages of solar cells
• Disadvantages of solar cells

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Intro to solar cell

• A solar cell (or a "photovoltaic" cell) is a
  device that converts photons from the sun (solar
  light) into electricity.
• It is a structure that converts solar energy
  directly into DC electrical energy.
• It is different from battery in a sense that the
  voltage supplied by the cell changes in the
  resistance of the load.

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BASIC PHYSICS OF SOLAR CELLS

• Silicon is from group 4 of the period table. When
  many silicon atoms are in close proximity, the
  energy states from bands of forbidden energy
  states.
• One of these bands is called band gap(Eg) and the
  absorption of light in Si is a strong function.

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BASICS OF SOLAR CELLS

• Silicon is covalently bonded it shared electrons
  when
• A silicon atom is replaced with the group 3 (Al,
  B) it forms a positive particle called hole that
  can move around the crystal through diffusion or
  drift.
• When a Si atom is replaced with a group 5 (As,P)
  it forms an electron that can move around the
  crystal.

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PHOTOVOLTAIC EFFECT

• In Figure

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BASICS OF SOLAR CELLS
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