Single junction structure
Poor efficiency(<30%)
Conversion rate ~ # of photon
Multi-layer structure
high efficiency(2times of 1st type)
Conversion rate ~ # of photon
Use photon energy
Very high(1hv → 2e)
Theoretical level
Dye electrons are excited by solar energy absorption
They are injected into the conduction band of TiO2
Get to counter-electrode (cathode) through the exter
In 1958, commercialization was
start by be used to Vanguard 1
satellite for power supply
In 1970, start enormous investment of commercialization and research
In 1977, development of amorphous solar cell
In 1991, invention of silicon solar cell mounted on the vehicle & start of the study about thin film pol
▶find photoelectric effect
Heinrich R. Hertz
▶design solar cell experiment
Cell (Basic cell of thesolar cell)
↓
Module (Form of assembling Cells)
↓
Array (Solar panel)
Hole moves toward
P type semiconductor
Electron moves toward
N type semiconductor
↓
Electrode formed
Current flows
↓
Solar cell generate
plastic film type solar cell
Prospect : Due to th
Strengths
No future expenditure in electricity
Environment-friendly
Weaknesses
High initial cost of solar panels
Low efficiency of solar energy,
compared to other sources
Opportunities
Technology development can
improve efficiency of solar energy
Threats
Preference for current resources of
electricity over solar energy
The emergence of
Organic solar cell
a photovoltaic cell that uses organic electronics like conductive organic polymers or small organic molecules for light absorption and charge transport
Basic principle of solar cell
When light is illuminated at cell, the photons are absorbed in the organic layers.
The excitons diffuse to interface between donor and acceptor.
The excitons are separated by electron