h+

e-

dyeacceptor

donor

hv

Donor-Acceptor typeDonor-Acceptor typeOrganic Photovoltaic CellOrganic Photovoltaic Cell

D + hv → D*

D* + acceptor → D+ +acceptor-

D+ + donor → D + donor+

Photovoltaic CellPhotovoltaic Cell

☞ ☞ Photovoltaic cell?Photovoltaic cell? Photovoltaic cells covert sunlight directlyPhotovoltaic cells covert sunlight directly

in to electricity. When sunlight is absorbedin to electricity. When sunlight is absorbed

by semiconducting materials, the solar by semiconducting materials, the solar

energy knocks energy knocks electrons loose from theirelectrons loose from their

atoms, allowing the electrons to flow throughatoms, allowing the electrons to flow through

the material to produce electricity. the material to produce electricity.

☞ ☞ Simple principle of Organic Photovoltaic CellSimple principle of Organic Photovoltaic Cell

substrateITO

HTMETM + DYE

electrode

electrode

Why Organic Photovoltaic Cell??Why Organic Photovoltaic Cell??

☞ ☞ Advantage of Organic Photovoltaic cell?Advantage of Organic Photovoltaic cell?

- High efficiency : up to 20%- High efficiency : up to 20%- Low cost : 0.6- Low cost : 0.6$/W$/W- Long lifetime : over 20 years- Long lifetime : over 20 years- No expensive process- No expensive process- Various structure- Various structure

Flexible PV cell!!Flexible PV cell!!

Fabrication of Organic Photovoltaic CellFabrication of Organic Photovoltaic Cell

SubstrateITO

Hole acceptor Passivation tape

Electron acceptor

SubstrateITO

SubstrateITO

electrode

☞ ☞ Process flow of Organic PV cellProcess flow of Organic PV cell ☞ ☞ Synthesis of Synthesis of Dye-CNTsDye-CNTs

Dye coated CNTs as Electron acceptorDye coated CNTs as Electron acceptor