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Transcript of Solar Cells
How Solar Cells Work ?
When solar panels are placed in the sunlight, photons will strike the surface and emit electrons.
As a result electron hole pair is created in the solar cell.
When external circuit is connected to the solar cell, electrons flow in the circuit and the current is generated.
How Solar Energy connects with our Environment
1) Clean : Solar power leaves no hazardous wastes and toxic byproducts as in Nuclear Power.
2) Sustainable : Coal, natural gas and oil, all are finite sources of energy and someday the supply will give out. However as the National Renewable Energy Laboratory (NREL) observes, the sun produces more energy in one hour that the entire planet could use in a year.
3) Safe : Solar energy collection is also extremely reliable, quiet and low-maintenance. It has no negative effects on land or aquatic environment like drilling and mining have.
What are Solar Cells ?
A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect.
History of Solar Cells -
1839 : The photovoltaic effect was first experimentally demonstrated by French Physicist A.E. Bequerel.
1941 : First silicon based solar cell demonstrated.
1954 : Beginning of modern solar cell research.
Advantages of solar cells
Global Green Renewable Energy Solution
2) Solar energy present in abundance
3) Maintenance free
4) No pollution
5) Have wide applications
6) More cells can be added to homes and businesses as the community grows so that energy generation is in line with demand
7) A good alternative for providing electricity for the present as well as the future generations.
Applications of Solar Cells
How can we as " ENGINEERS " contribute to develop Solar Power
1) By developing materials which are thick and suitable for absorbing sunlight.
2) One such strategy envisions cells made with tiny cylinders or nanorods. Light could be absorbed down the length of the rods, while charges could travel across the rod's narrow width.
3) Another approach involves a combination of dye molecules to absorb sunlight with titanium dioxide molecules to collect electric charges. But large improvements in efficiency will be needed to make such systems competitive.