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Title: Knee Sleeves Guide


1
Presentation on solar cells
  • Raja Khurram Shahzad

2
overview
  • Introduction
  • Solar cells
  • Basic physics of solar cells
  • Types of solar cells
  • Photovoltaic effect
  • Advantages of solar cells
  • Disadvantages of solar cells

3
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.

4
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.

5
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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7
PHOTOVOLTAIC EFFECT
  • In Figure

8
BASICS OF SOLAR CELLS
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