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PPT : Clean Solar Energy – The impact of nanoscale science on solar energy production
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Projected U.S. Energy Demand in 2050
* To meet projected U.S. demand in 2050, solar cells would need to cover approximately one third of the U.S.
Solar Panel Use Today
* Large companies like Google, Walmart, and Microsoft use solar energy to partially power some of their facilities
Solar panels on Microsoft building
Solar panels being tested on Walmart store
Photovoltaic Solar Cells
* Generate electricity directly from sunlight
* 2 Main types:
o Single-crystal silicon (traditional)
+ Widespread
+ Expensive to manufacture
o Dye-sensitized (“nano”)
+ Newer, less proven
+ Inexpensive to manufacture
+ Flexible
Solar Cells are Converters of Energy…
* Solar cells are devices that take light energy as input and convert it into electrical energy
Solar cell – converts light energy to electricity
Electrical energy (carried through wires)
…But Not All Energy is Converted
* Like chloroplasts in plants, solar cells can only absorb specific wavelengths of light.
* In both, light that isn’t absorbed is either transmitted through or reflected back.
* Whether a certain wavelength of lights gets absorbed depends on its energy.
Chlorophyll molecules absorb blue and red light, but reflect green light
A Little Background on Light
* Different colors of light have different wavelengths and different energies
Source: http://www.mhhe.com/physsci/astronomy/arny/instructor/graphics/ch03/0305.html
Absorption of Light by Atoms
Sources: http://members.aol.com/WSRNet/tut/absorbu.htm, http://csep10.phys.utk.edu/astr162/lect/light/absorption.html
Single electron transition in an isolated atom
* Absorption occurs only when the energy of the light equals the energy of transition of an electron
* Molecules have multiple atoms bonded together
* More energy states in molecules than atoms
* More electron “jumps” possible – light with a range of frequencies are absorbed
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Category : Solar PowerSource : nanosense.org
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Language : English
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Tags: absorption of light, chlorophyll molecules, electron molecules