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.

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

PROCESSES IN AN ORGANIC SOLAR CELL

• Absorption of light

• Charge transfer and separation of the opposite

charges

• Charge transportation

• Charge collection

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.

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

Advantages and Disadvantages:-

Advantages

Environmentally Safe

Flexible

Lightweight

Inexpensive

Disadvantages

Low efficiency (only 8% efficiency compared to the 25% of silicon cells)

Short lifetime

Technological Importance :-

Bring some polymer paint and coat the windows and walls to make

your own solar cell

Transportation

Military use

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.

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

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