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The magic of photosynthesis in plants is expected to help mankind to realize the dream of clean energy. Science and Technology Committee recently learned of the city, East China Normal University, researchers using nano-materials laboratory successfully “re” “chloroplast” to achieve a very low cost solar energy generation.

Chloroplasts are the sites for photosynthesis, can efficiently convert sunlight into chemical energy. This time, the research group is not in plant in vitro, “copy” of a chloroplast, but in nature as inspiration, and the structure of chloroplasts, developed a new battery — similar dye sensitized solar cells, attempts to convert energy to adult class as the electricity needed. In support of Shanghai Nano Special Fund, after three years of experience and exploration, this bionic piece of electro-optical conversion efficiency of solar cells for more than 10%, almost 11% of the highest rate in the world.

Project Manager, East China Normal University na optoelectronic integrated with advanced equipment Ministry of Education, Professor Zhuo Sun, Director of Engineering Research Center, showed reporters a new type of solar cells, “sandwich” sandwich structure — - insulation layer nano-glass sandwich, light electro-transformation on the delicate hidden in this layer a few tens of microns thick composite film. Deep inside, nano-sandwich “and” recipe “is unique: Dye to act as” light-hand harvesting, nano-titanium dioxide is “Media Converter”. To make dyes, as far as possible, “eat” the sun, researchers have even inspired to Caesar, the “point of seasoning” — a kind of fluorescent material by the nano-quantum dots, so that different wavelengths of light may be entitled to a “capture lightly “appetite”. “Continue to improve as the” recipe “nano” sandwich “of the photoelectric conversion efficiency can be increased again and again.

Speaking of solar, it is not foreign. Monocrystalline silicon or polycrystalline silicon as the main raw material for solar panels are becoming more ornate building on the rooftops of the city walls, became a block of pollution own cost solar power. However, in what is called “Green Power” back, but to “hide” a series of high-energy, high-polluting production processes. Despite its photoelectric conversion efficiency as high as 15% -20%, but prices of raw materials and the purification process by the restrictions, costs of electricity generation are still high.

In 1991, the “Nature” magazine has reported that Swiss scientists have simulated photosynthesis of plants, the world’s first invention of dye sensitized solar cells, its photoelectric conversion efficiency in all optical radiation up to 7% -8 %, this new type of low-cost photovoltaic cells soon become an area of research worldwide.

As a third generation of solar cells, dye sensitized cells of the biggest attraction is the cheap raw materials and production process simple. It is estimated that the panels the cost of silicon dye sensitized solar cells equal to only 1 / 10. At the same time, the lighting conditions less demanding, even in the sun is not enough space, the photoelectric conversion rate will not be seriously affected. In addition, it also has many interesting uses. For example, with an alternative to plastic glass “splint”, it may be because of the curved flexible battery; into a monitor, you can then generate electricity, while light from reaching the Energy self-sufficiency.

Of course, a major promotion and application of dye sensitized solar cells there are still some to be addressed by “weakness”. Sun Zhuo said, the next step, scientists will focus on the effectiveness of these cells decreases with the size of larger problems and continue to extend its lifetime.

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