Organic Solar Cells - Generations of Solar Cells

Sunlight --> Electricity

 

A. E. Becquerel, 1839 . He stated that we can get energy from sunlight. It took a very long time until we made that.

 

Bell labs, 1950s , Solar panel was invented. Efficiency 6% at that moment. Very expensive. Only for satellites and so on.

People thought a lot about that.

Energy crisis, 1970s.

 

1st generation

Crystalline silicon, Expensive, High material usage, Embodies a lot of energy

crystalline
结晶的
晶质的

 

2nd generation

 

Think file solar cells

Amorphous silicon: Lower temperature ( few hundred degress), Inherent problems (Staebler–Wronski effect

http://en.wikipedia.org/wiki/Staebler%E2%80%93Wronski_effect)

 

Here is a brife introductions of Staebler–Wronski effect:

The Staebler–Wronski Effect (SWE) refers to light-induced metastable changes in the properties of hydrogenated amorphous silicon.[1]

The defect density of hydrogenated amorphous silicon (a-Si:H) increases with light exposure, causing an increase in the recombination current and reducing the efficiency of the conversion of sunlight into electricity.

It was discovered by David L. Staebler and Christopher R. Wronski in 1977. They showed that the dark current and photoconductivity of hydrogenated amorphous silicon can be reduced significantly by prolonged illumination with intense light. However, on heating the samples to above 150 °C, they could reverse the effect.[2]

 

 

amorphous
*[ә'mɒ:fәs]
a. 无定形的, 无组织的
【化】 非晶形的; 无定形的
【医】 无定形的, 非晶形的

 

 

But the 2nd generation solar technology has solved the problems as the followings:

1) high embodied energy

2) high manufacturing temperatrue

3) high materials use

 

But introduced

1) Poor stability

 

Thin film thechnologies

1) Amorphous silicon

2) Cadmium telluride

3) CIGS  (Copper indium gallium selenide. more from wiki: http://en.wikipedia.org/wiki/Copper_indium_gallium_selenide)

 

cadmium
*['kædmiәm]
n. 镉
【化】 镉Cd
【医】 镉(48号元素)

 

telluride
*['teljuraid]
n. 碲化物
【医】 碲化物

 

All inherently unstable

1) back contacts

2) sensitivity to atmosphere (water / oxygen)

 

 

3rd generation

1) lower cost

2) thinner films

3) Lower temperatures

Organic Solar Cells - Generations of Solar Cells_第1张图片

 

1) > 10% efficiency

2) Thin

3) low materials usage

4) Fast manufacture

 

Organic Solar Cells - Generations of Solar Cells_第2张图片

 

 

what 3rd generation publications are going on?

Organic Solar Cells - Generations of Solar Cells_第3张图片

Organic Solar Cells - Generations of Solar Cells_第4张图片

Publication shows something. But comparing to computer technology, solar energy is upgrading way too slow...

 

 

Organic Solar Cells - Generations of Solar Cells_第5张图片

 

Organic photovoltacis ( poor performance at the present )

1) Scalable

2) no toxic material

3) low environment impact

Organic Solar Cells - Generations of Solar Cells_第6张图片

 

cycling

 

Maybe this is the future. but at the present  this kind of organic solar cells need real technology improvements.

 

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