1. Organic Photovoltaic Cell
Photovoltaic cells covert sunlight directly
in to electricity. When sunlight is absorbed
by semiconducting materials, the solar
energy knocks electrons loose from their
atoms, allowing the electrons to flow through
the material to produce electricity.
☞ Simple principle of Organic Photovoltaic Cell h+ e-
dye
acceptor
donor hv
D + hv → D*
D* + acceptor → D+ +acceptor-
D+ + donor → D + donor+
Donor-Acceptor type
Organic Photovoltaic Cell

2. Why Organic Photovoltaic Cell??
☞ Advantage of Organic Photovoltaic cell?
- High efficiency : up to 20%
- Low cost : 0.6$/W
- Long lifetime : over 20 years
- No expensive process
- Various structure
electrode
ETM + DYE
electrode
HTM
ITO
Flexible PV cell!!
substrate

3. Fabrication of Organic Photovoltaic Cell
☞ Process flow of Organic PV cell
☞ Synthesis of Dye-CNTs
Substrate
ITO
Hole acceptor
Passivation tape
Electron acceptor
Substrate
ITO
Substrate
ITO
electrode
Dye coated CNTs as Electron acceptor