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
3.
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.
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