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Semiconductors and Solar Cells

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by

Kelly Zhang

on 5 December 2013

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Transcript of Semiconductors and Solar Cells

Semiconductors and Solar Cells
Photovoltaics:
about
vocabulary
Topic Overview
history
"the 3 how"s
how it's made
how it's used
A method of generating electrical power by converting solar radiation into DC using semiconductors that exhibit the photovoltaic effect.
Photoelectric Effect:
Electrons can be ejected from a surface by light under certain conditions, when exposed to sufficient electromagnetic energy.
Heinrich Hertz (1857-1894)
These electrons, called photoelectrons, can then be used to start circuits and convert energy from light into energy that we can use.
First observed the photoelectric effect in 1887.
Phillipp Lenard (1862-1947)
Effect that takes place when electromagnetic radiation hits a metallic surface
Hertz's assistant. Performed the earliest studies of the photoelectric effect.
Using light to displace electrons can have many practical applications.
Edmund Becquerel (1820-1891)
Discovered the photovoltaic effect in 1839.
Albert Einstein (1879-1955)
Explained the nature of light and the photoelectric effect to a further degree.
The Solar Electric Effect: A Closer Look
EM Radiation
Displaced Electrons
How it works
In order to successfully expel electrons from a photoemissive surface, the light must be within the threshold frequency-different depending on the surface.
Metallic Surface With Electrons
The electron is then ejected immediately after the light is shined-with only a 10^-9 of a second delay.
Photoelectron:
An electron that has been pushed off its surface by the photoelectric effect.
Photoemissive:
A surface on which the photoelectric effect can occur.
Semiconductors
A semiconductor is a material with conductive properties between that of a conductor and an insulator.
They are essential to many electronic devices due to their ability to be controlled by exposure to heat, light, a magnetic or electric field and by doping-inducing impurities.
Their unique properties make them ideal for usage in electronic components such as diodes and transistors.
Where to Next?
More efficient solar panels that take up less space
Better semiconductors
By Kelly, Sadiq, and Neil
About
Vocabulary
History
Semiconductors
The 3 How's
How it's Made
How it Works
How it's Used
Where are We Going next with it?
end
At the atomic level, the gap between the valence band and the conductive band of a semiconductor is very narrow.
Elevators!
Autonomic Doors!
SOLAR PANELS!!
More automated devices such as motion activated doors
Safer machinery that will stop working automatically when a human is dangerously in it's path
Full transcript