The "third generation" power generation technology, which is green photovoltaic power generation technology, is characterized by green, high efficiency, low cost and long life. On November 28th, He Ji, academician of the Chinese Academy of Sciences, held a 2011 China (Taizhou) solar industry high-level forum held in Taizhou, Jiangsu, that China's third-generation photovoltaic power generation technology has made major breakthroughs.

At the forum, He Yan, an academician of the Chinese Academy of Sciences, said that the first generation of photovoltaic power generation technology = crystalline silicon photovoltaic power generation, there is a difference between monocrystalline silicon and polysilicon; the second generation of photovoltaic power generation technology = fancy variety of thin film batteries; the third generation of photovoltaic power generation Technology = "solar silicon + tracking + spotlight + high-efficiency concentrating silicon battery". Of course, some people think it is "high-power spotlight + tracking + high efficiency condenser GaAs battery."

He Wei stated that the Ministry of Industry and Information Technology believes that there are many “links” in the industry from the refinement of high-purity silicon to the production of photovoltaic modules. They are high energy-consuming and highly polluting industries, and only energy recovery is at least as long as 2 to 3 years! The reason is that the production of polysilicon by the modified Siemens process consumes energy of up to 150-200 degrees per kilogram, and at the same time generates silicon tetrachloride in a highly polluted environment. The "third-generation" photovoltaic technology will significantly reduce the amount of polysilicon, and solar silicon will not only consume less energy, but also have no pollution.

Why does the "third time" photovoltaic technology significantly save polysilicon? He Hao believes that the first is tracking, and now has made a very good performance, to avoid wind, rain, thunder, squatting, including dust storm pollution tracking funnel, at least increase the direct light power generation by 30% to 40%.

Followed by concentrated light, can significantly reduce the photocell silicon and non-silicon materials used, for example, 4 times the condenser, especially for the "direct light" of the condenser, can silicon, non-silicon materials per degree of power "energy ” Drop to the original 1/4.

In addition, concentrated high efficiency silicon-based batteries, the higher the conversion rate of silicon batteries, the less polysilicon consumed. At present, the n-type silicon-based concentrator cells with a conversion rate of 22% supplied by the United States Sun Power Corporation are used. And it is "wonderful" that under the condition of spotlight, there will be non-linear growth of concentrator cells. 4x Concentration Resulting in Closed-Loop Open Loop Voltage Increase of 10%! Therefore, this n-type photovoltaic cell shows a conversion rate of 24.5%!

Finally, the "core" technology is solar silicon, which has a series of advantages, will greatly reduce the fossil energy consumption, no pollution such as silicon tetrachloride, high quality, long life, only weak light attenuation, low cost, "Possible" will reduce the current market price of solar high-purity silicon from about 250 to 500 yuan/kg to only 75 to 150 yuan/kg, turning the polysilicon industry into a green industry.

The above-mentioned "green" power generation technology, or "third generation" photovoltaic power generation technology, has established a "4x spotlight + turntable tracking", small-scale photovoltaic power station with a peak power of 1 MW in the Wuwei area of ​​Gansu Province.

He Academician said that solar power stations can be built not only in deserts but also on land. At the same time, “solar water lilies” can also be realized on the surface of the water. Prof. Chen Yingtian of the Institute of Theoretical Physics of the Chinese Academy of Sciences has conducted an experiment to hold the condenser funnel underwater. In the depths of centimeters, after 2 months, there was no slightest vapor in the funnel! However, the existing flat panel photovoltaic modules are generally not resistant to water vapor interference.

He Jiashi believes that there are many large-scale and super-large photovoltaic power plants in China, and Qinghai Lake, Poyang Lake, Taihu Lake and Hongze Lake in China all have an area of ​​more than 4,000 square kilometers. China is located in the Bohai Sea in Dali City, Yunnan Province. Its surface is about 250 square kilometers. China's Bohai Bay is actually China's inner sea, and its coverage of water is over 20,000 square kilometers. Only Bohai Bay can place 1 billion kilowatts of solar panels. (Zhou Shengtao Zhang Xiaoyan Han Lin)

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