Solar energy is best renewable energy. It is our future light source.

1. INTRODUCTION
 SOLAR CELL
Solar cell or photovoltaic cell, is an electrical device that converts the energy of
light directly into electricity by the photovoltaic cells.
 ORGANIC SOLAR CELL
The approach is based on solar cell made by entirely new materials, conjugated
polymers and molecules.

2. Need…
 Global energy crisis.
• Energy demand will double in next 50 years.
• Fossil fuels stock is running out
The amount of solar energy intercepted by the earth
in 1 hour is more than the annual world energy
consumption

4. PROCESSES IN AN ORGANIC SOLAR CELL
• Absorption of light
• Charge transfer and separation of the opposite
charges
• Charge transportation
• Charge collection

5. Latest work…
 Researchers at Spain's Universitat Jaume I in Castelló and Oxford
University are claiming a new record efficiency of 15.6 percent
for a graphene-based solar cell.
 It uses a combination of titanium oxide and graphene as a charge
collector and perovskite as a sunlight absorber.
 It is manufactured at low temperatures using a solution based
deposition technique
 Advantages :-
 lower potential production costs
 technology can also be used on flexible plastics.

6. EXPERIMENTAL OUTLOOK
 Measurements of Current−voltage, capacitance−voltage,
and external quantum efficiency are taken.
 Doping with bis-(trifluoromethanesulfonyl)amide in
graphene leads to a shift in chemical potential which
increases .
 the graphene carrier density (decreasing the cell
series resistance)
 the cell’s built-in potential (increasing the open
circuit voltage)
both of which improve the solar cell fill factor.
a) Without Doping b) With Doping

7. Advantages and Disadvantages:-
 Advantages
Environmentally Safe
Flexible
Lightweight
Inexpensive
 Disadvantages
Low efficiency (only 8% efficiency compared to the 25% of silicon cells)
Short lifetime

8. Technological Importance :-
Bring some polymer paint and coat the windows and walls to make
your own solar cell
Transportation
Military use

9. FUTURE CHALLENGES
 The present efficiency of polymer solar cells lies near 10%, well below silicon cells.
 Polymer solar cells also suffer from environmental degradation, lacking effective protective
coatings.
 Further improvements in performance are needed
 to promote charge carrier diffusion
 transport must be enhanced through control of order and morphology
 interface engineering must be applied to the problem of charge transfer across interfaces.

10. REFERENCES
 Introduction to polymer solar cells (3Y280) by René Janssen
Departments of Chemical Engineering & Chemistry and Applied Physics
Eindhoven University of Technology, The Netherlands
 Bonaccorso, F.; Colombo, L.; Yu, G.; Stoller, M.; Tozzini, V.; Ferrari, A. C.; Ruoff, R. S.;
Pellegrini, V. Graphene, related two dimensional crystals, and hybrid systems for energy
conversion and storage
 M. Xiaochang, T. Sefaattin, P. Maureen, B. Kara, R. Andrew, A. Bill, H. Arthur, High
efficiency solar cells by chemical doping, Nano Letters.
 www.Wikipedia.org
 www.google.com

11. Thanks !