Single crystalline SI solarcellsingle -> wood [lumber]
Poly -> veneer board
High efficiency,
no matter where work
Due to indirect band gap,
optical absortion rate is very low
Single crystalline solarcellSingle crystalline
Classification Single crystalline
Degree of purity high
Defect density low
Efficiency High
Maximum limi
석유, 석탄, 천연가스 등의 화석에너지 자원들은 고갈되고 있고, 시대가 지나면서 에너지 문제의 중요성은 더욱 증가되어 에너지 안보 문제가 심각하다. 우리나라는 2009년도 기준 에너지 해외 의존도가 약 96.2%로 세계 에너지 시장의 변화에 취약한 구조를 가지고 있다. 특히 중동 지역의 의존도가 2008년
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
Phosphor (Energy Converter)
Inorganic phosphor materials
“Classical” inorganic phosphors usually consist of a host lattice with activator ions doped into it in small concentrations, typically a few mole percent or less.
Host lattice & Activator ion
1st type : weak interaction (Ln3+)
2nd type: strong interaction ( Mn2+, Eu2+, Ce3+, Pb2+,Sb3+, Ce3+, MoO42-, NbO43-)
Activator (+ Sensit