Photovoltaic Cell
☞ 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
e-
D + hv → D*
D* + acceptor → D+ +acceptorD+ + donor → D + donor+
donor
hv
h+
dye
acceptor
Donor-Acceptor type
Organic Photovoltaic Cell
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
electrode
ETM + DYE
HTM
ITO
substrate
Flexible PV cell!!
Fabrication of Organic Photovoltaic Cell
☞ Process flow of Organic PV cell
☞ Synthesis of Dye-CNTs
Hole acceptor
Passivation tape
ITO
Substrate
Electron acceptor
ITO
Substrate
Dye coated CNTs as Electron acceptor
electrode
ITO
Substrate