The most common form of solarcells are based on the photovoltaic (PV) effect
Two layer semi-conductor device produces a photovoltage or potential difference between the layers
No fuel cost or fuel supply problem
No pollution
High reliability
Small amount of power required
Depend on place and climate
Large scale:
Ocean navigation aid
Telecommunication system
Remote moni
Single crystalline SI solarcell
single -> wood [lumber]
Poly -> veneer board
High efficiency,
no matter where work
Due to indirect band gap,
optical absortion rate is very low
Single crystalline solarcell
Single crystalline
Classification Single crystalline
Degree of purity high
Defect density low
Efficiency High
Maximum limi
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 solarcell
In 1991, invention of silicon solarcell mounted on the vehicle & start of the study about thin film pol
Converts sunlight directly into electricity
Non polluting
Long lasting sources of energy
No need of maintenance
In the long run, solar electricity is cheaper
Electrons of dye absorb solar energy
Electrons of dye are excited & Generate electron-hole pairs
Electrons transfer from dye to FTO via TiO2
1/2 I3- + e 3/2 I- at counter electrode
3/2 I- 1/2