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
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
WHAT IS A SOLARCELL?
Devices that convert solar energy to electric energy.
WHAT IS PHOTO ELECTRIC EFFECT?
The photoelectric effect is a phenomenon in which electrons are emitted from matter as a consequence of their absorption of energy from electromagnetic radiation of very short wavelength, such as visible or ultraviolet light
Absorption and generation of exciton
Dissociation and
Ⅰ. 신재생에너지 (New Renewable)
- 현재 전 세계는 화석에너지와 원자력에너지에 크게 의존하고 있다. 하지만 화석에너지의 고갈과 원자력 발전 시에 발생하는 사고와 후유증의 위험을 감지하고 재생에너지의 비율을 높이려 노력하고 있다. 고갈되어 가는 화석연료를 대체할 수 있는 다양한 신,재생 에너
2. 염료감응형 태양전지에서의 Nano 핵심 기술
(1) 나노입자로 만든 다공질 TiO2
염료 감응형 전지의 효율을 급속히 올릴 수 있게 된 주요 원인 중의 하나는 반도체 표면적의 증가이다. 앞에서 언급한 바와 같이 염료고분자는 단분자층일 때 효율이 높으므로, 태양광의 흡수양은 염료고분자가 코팅된 반