Power Generating Solar Paint

Presented by ABHISHEK.M.HAVANUR

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KHKabbur institute of engineering Dharwad

Topics to be covered Introduction Conventional Solar Cell Quantum dots Solar paint Graph Photo electrochemical

performance Comparison Applications Challenges Conclusion

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Introduction Urgent need for new ways of generating electricity

Development of new technology

Low cost solar energy

Paint coatings or Flexible plastic sheets (PET)

Applied to building, vehicle and appliances

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Conventional solar cell

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Quantum dots Semiconductor whose excitons are confined in all three spatial

dimensions

Typically have dimensions measured in nanometers

Boosts the energy conversion efficiency

Types of quantum dot solar cells

a. ETA(Extremely thin absorber) cells

b. Sensitizers5

Continued….

a) Can be linked together as molecules

b) Lattices

c) Attached to a polymer backbone

d) Incorporated into a polymer thin film 6

How to prepare solar paint

Consists of Cds, CdSe and TiO2 particles

There are two methods

a. Physical mixing of TiO2 and CdS in a mixed solvent

b. Pseudo-SILAR(Sequential Ionic Layer Adsorption and Reaction) method

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A) Tert-butanol and water as solvent

B) CdS powder and TiO2 powder are slowly mixed into the solvent

C,D) CdS deposited on TiO2 after

pseudo-SILAR process

E,F) Annealed films of solar paint

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Solar paint

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Graph

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Photo electrochemical performance

electrode ratio method Jsc (mA/cm2) Voc (mV) η (%)

CdS/TiO2 1.5:1.0 Mix 2.26 600 0.71

CdS/ZnO 2.25:1.0 Mix 3.01 675 0.57

CdS/ZnO/TiO2 2.0:1.0:0.2 Mix 3.63 685 0.89

CdS/TiO2 1.0:3.5 SILAR 2.33 615 0.87

CdSe/TiO2 1.0:5.0 SILAR 2.12 608 0.83

CdS–TiO2/

CdSe–TiO2

1.0:1.5 SILAR, mix 3.1 585 1.08

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Comparison

Conventional solar cell Not flexible and heavy

Can not respond at low light levels

Provides power comparatively at higher cost

Cell made from solar paint Flexible and very thin

Can even respond at low light levels

Provides power at low cost

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Challenges

Improving the light to energy conversion rate

Applying paint directly on to the roofs of the building

Work still needs to be done to improve the conducting material

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Future Applications

Sweater coated with paint could power a cellphone or other wireless devices

A hydrogen powered car coated with paint could convert energy into electricity to continually recharge the battery

Industries can generate their own power just by coating paint on the building surface

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Conclusion

The paint can be made cheaply and in large quantities. If the efficiency is improved somewhat it will make a real difference in

meeting energy needs in future

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