SIR M.VISVESVARAYA INSTITUTE OF TECHNOLOGY

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INTRODUCTIONSolar energy plays a major role in present days.It is renewable source of energy.This presentation is about the new type of solar cell. It is 5 times efficient than conventional solar cells.

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Nanotechnology is about building things atom by

atom, molecule by molecule.

Nanotechnology is billionth of a matter.

It is defined as the study of functional structures with dimensions in the range of 1-100 nanometer.

NANOTECHNOLOGY

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WORKING OF SOLAR CELL These are photovoltaic (PV) cells based on crystalline silicon.

It absorbs visible sunlight and transferred to the semiconductor material.

This energy knocks electrons to flow freely, which results current.

Current is drawn from the metal contacts in PV cell.

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FIGURE SHOWING THE WORKING OF SOLAR CELL

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WHY NANOTECHNOLOGY IN SOLAR CELL

The conventional solar cells are less efficient.

Their efficiency is very poor in cloudy days.

To overcome above problems, A new type of solar cell embedded with NANOTECHNOLOGY is developed, which is INFRARED PLASTIC SOLAR CELL.

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INFRARED PLASTIC SOLAR CELLA plastic solar cell can turn the suns power into electric energy even on a cloudy day.

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It uses specially designed nano particles called quantum dots.

The quantum dots with a polymer to make the plastic that can detect energy in the infrared.

QUANTUM DOTQUANTUM DOT LAYER

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WORKING OF PLASTIC SOLAR CELL

It consists of cadmium selenide (CdSe) nanorods and blended with P3HT(poly-3hexylthiophene).

It requires semiconductor nanorods (7 nm by 60nm).

The heart of a solar cell is a 200-nm-thick film.

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A layer only 200 nanometers thick is sandwiched between electrodes.

It can produce 0.7V at present

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When nanorods absorb light they generate an electron and an electron hole.

Electron is collected by alluminium electrode.

The hole is transferred to the plastic and conveyed to the electrode, creating a current.

Aluminium coating acts as the back electrode .

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Better light collection and concentration employed in the solar cells.

In plastic cells nano rods are closely packed and transfer their electrons more directly to the electrolyte.

They also hope to tune the nano rods to absorb different colors to span the spectrum of sun light.

IMPROVEMENTS

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Hydrogen powered car:

Hydrogen car painted with the film could convert solar energy into electricity to continually recharge the cars batteryAPPLICATIONS

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Chip coated in the material could power cell phone

A couple of drops if the titanium dioxide suspension is then added.

The slide is then set aside to dry for one minute.

Coating the cell :

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These are considered to be 30% more efficient.Their efficiency is same even on cloudy days.These are very compact and more practical in application. These cells avoid effects like pollution.These are flexible and have the capability to turn suns power into a clean,green,consistent source of energy

ADVANTAGES

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They are very costly.

Relatively shorter life span when continuously exposed to sunlight.

It requires higher maintenance and constant monitoring.

LIMITATIONS

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Plastic solar cells help in exploiting the infrared radiation.More effective when compared to conventional solar cells. They can even work on cloudy days. Though at present cost is a major drawback, it can be solved in the near future.

CONCLUSION

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Nanomaterials: Synthesis, Properties and Applications: Edelstein, A. S., Cammarata R. C., Eds.; Institute of Physics Publishing: Bristol and Philadelphia, 1996. The Coming Era of Nanotechnology; 1987. Drexler, K. Eric, Doubleday; New York A gentle introduction to the next big idea-Mark A. Ratner, Daniel Ratner. Introduction to nanotechnology- Charles P Poole, Frank J Owens The clean power revolution- Troy Helming

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