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Solar Cell

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Published in: Chemistry | Mechanical
9,237 Views

A PPT on Solar Cell

Neha M / Chandigarh

8 years of teaching experience

Qualification: M.Sc (Kurukshetra University , Kurukshetra - 2011)

Teaches: Chemistry, Physics, Mathematics, Science, B.Tech Tuition, IIT JEE Advanced

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  1. Solar Cell: The Ultirnate Renewable Power from the Sun.
  2. Renewable Energy Alternate sources of energy , Solar Energy. Wind Emergy. G eothermaLEnergy. , Fuel cells.
  3. Why Solar Energy ? Solar energy is the most readily available source of energy. It is free. It is also the most important of the non- conventional sources of energy because it is non-polluting.
  4. Working principle of solar cell It is based on the ability of a semiconductor to directly convert sunlight into electricity. Basically, a solar cell is a P-N junction that absorbs light, releases electrons and holes, creating a voltage in the cell, which is then applied to the load.
  5. Photovoltaic Effect Photovoltaic effect is generated photons hit a semi- conductor Material with a higher energy than the gap between its Valence andConduction bands. Free electrons move on one side (n-side) while holes move on the other side (p-side) A difference of potential is created between n-side and p-side allowing current through a load outside of the semi-conductor. Contact surface Contact surface n-layer Extra electrons Junction Extra holes p-layer
  6. How much solar energy? Atmosphere Scattered Absorbed Transmitted Direct solar The surface receives about 47% of the total solar energy that reaches the Earth. Only this amount is usable.
  7. Putting Solar Energy to Use: Heating Water Two methods of heating water: passive (no moving parts) and active (pumps). In both, a flat-plate collector is used to absorb the sun's e n ergy-to-heat-the-water. The water circulates throughout the closed system due to convection currents. Tanks of hot water are used as storage. Absorber plate covers Net•t box insolatioø rebes tot liqvid
  8. Heating Living Spaces Best design of a building is for it to act as a solar collector and storage unit. This is achieved through three elements: insulation, collection, and storage. Efficient heating starts with proper insulation on external walls, roof, and the floors. The doors, wi ndows;-and-vents-must be-designed-to-minim i ze heat loss. Collection: south-facing windows and appropriate landscaping. Storage: Thermal mass—holds heat. • Water= 62 BTU per cubic foot per degree F. • Iron-54, Wood (oak) -29, Brick-25, concrete=22, and loose stone=20

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