交大开元太阳能

With economic development, social progress and people's increasing energy requirements put forward to find new energy sources become an urgent issue facing humanity. There are existing energy thermal power, hydropower and nuclear power.

Thermal power need to burn coal,oil and other fossil fuels. On the one hand, the limited fossil fuel reserves is facing the danger of depletion. It is estimated that the world oil resources will be exhausted 30 years. On the other hand,thermal power will emissions of CO2 and sulfur oxides, it will lead to the greenhouse effect and acid rain,lead to deterioration of the earth's environment.

Hydropower lead to a large number of flooded land,ecological damage and large-scale collapse once the reservoir collapse, the consequences would be disastrous. In addition, the country's water resources is also limited, but also by the season.

Under normal circumstances, nuclear power is a clean, but in the event of a nuclear leak, the consequences are equally dire. The former Soviet Union, the Chernobyl nuclear power plant accident, has 9,000,000 people have been varying degrees of damage, and this did not mean the termination of the effection.

These forced people to find new energy sources.At the same time, new energy sources to meet two conditions: First, the rich will not dry up; Second, safe and clean, not a threat to humans and the environment. At present, to find new energy in the main, two, one solar energy, and the other is the fuel cell. In addition, wind power could also be regarded as supporting the new energy. Of these, the best new energy is able to solar power.

Solar power is the ideal new energy

Exposure on the earth's solar energy is very large, about 40 minutes exposure on Earth's solar power would be sufficient for the world's energy consumption a year. It can be said that solar energy is truly inexhaustible source of energy. Solar power is clean and does not have a public hazard. Therefore, solar power is praised as an ideal source of energy.

According to this map of the Po whose theory of the formation of the solar system, solar radiation to space out the giant solar thermal energy.

Solar power to achieve real practical level, it is necessary to improve the photovoltaic solar energy conversion efficiency and reduce costs, and the other is to be achieved solar power out put in current electronical power network.

At present, solar power panel are three types as single crystal silicon, polycrystalline silicon, amorphous silicon. Monocrystalline silicon solar cell conversion efficiency is of the highest in excess of 20%, but also the most expensive price. Amorphous silicon solar panel conversion efficiency is of the lowest price but the cheapest.The most promising future for power generation in general is this type.Once the components of its large area

photovoltaic conversion efficiency reach to 10% and the price-per-watt power generation fell to USD 1-2, then it can compete with the current power system. It Can be estimated at the end of the century it will reach this level.

Of course, in special-purpose laboratory the efficiency of solar cells is much higher, such as the United States developed by the Boeing Company with the semiconductor gallium arsenide semiconductor gallium antimonide overlap from the sun's power, photoelectric conversion efficiency up to 36% , And soon caught up with the efficiency of coal-fired power generation. However, it is too expensive, can only be limited to the use of the satellite.

The application of solar power generation

Although solar power by day and night, the barometer, the impact of the season,however it suitable for families divided for power generation excited, but also to output to the electricity network,making power in the well-off families can be Sold to power companies, when insufficient they also buy power from power companies.The realization of this technology is not difficult to solve, the key is to have the appropriate legal protection. Now the

United States, Japan and other developed countries have drawn up a corresponding law, to ensure that solar power to carry out the interests of the family, encourage families to carry out solar power generation.

In April 1992,Japan was to achieve a solar power generation system with the power company's power network interconnection,some families have begun to install solar equipment. Japan Industrial Policy Bureau from 1994 to individuals for the implementation of the purchase of solar power generation equipment grants two-thirds of the system. Require 1,000 households in the first year, in 2000, when there are 70,000 households equipped with solar power generation equipment.

According to the Japanese authorities estimated,in Janpan there are 21,000,000 individuals in residential, if 80% fitted with solar power generation equipment, that will be able to meet the country's total electricity needs of 14%, if the factory and office space and other units also conduct solar power, solar power generation will account for 30% -40% of National power. At present,as block the popularization of solar energy, the most important factor is the high cost. In order to meet the needs of an average family of 3 kilowatts of electricity generating system, to be 6-7 million yen, not including the installation of finished products. Experts believe that at least down to 1-2 million yen, solar power can truly universal. The key is to lower the cost of solar cells transform to improve efficiency and reduce costs.

Not long ago, the United States Texas Instruments Inc. and SCE announced that they developed a new solar cells, each unit is less than 1 mm in diameter with beads, they are densely distributed in the rules of soft aluminum foil, as many Silkworm eggs close to the same paper. There were 1,700 such units are spread out in the area about 50 square centimeters.The new battery is characterized by cheaper, although the conversion efficiency of only 8% -10% . Aluminum foil substrates and soft fruit, can be as random as folding clothes, and can be hung facing solar light, very convenient. It is said that this new use of solar cells per watt of generating capacity of equipment as long as 1.5-2 U.S. dollars, and the cost of electricity could be reduced to about 14 cents.It can compete with the ordinary power plant.Each family will hung such a battery  on roof exposed to the sun,

walls, which will be generate about 1000KW/h electricity.

The prospects for solar power generation

Solar power generation are more exciting. First, Japan put forward by the Genesis program. Ready to use on the ground for desert and sea power, and through the superconducting cables,the world's solar power will be unified power network meet the world's supply. It is estimated that by the year 2000, 2050, 2100, even with the entire global supply of solar energy, but also as an area of 651,100 square km, 1,867,900 square km, 8,291,900 square kilometers. 8,291,900 square kilometers of the total ocean area of only 2.3 percent, or 51.4 percent of all the desert, and even the Sahara desert is 91.5 percent. Therefore this is possible.

Another is the power generation program in the space. As early as 1980, NASA and the Department of Energy proposed the construction of solar power stations vision of space, ready to put in orbit on a 10 km long and 5 km wide of the large flat-top, covered with solar cells, which can provide 5,000,000 Kilowatts of electricity. However, this need to be addressed to the wireless transmission problems on the ground. Now using microwave beam, the laser beam and other programs. Although the current model of aircraft used to achieve a short-range, short-term, low-power wireless microwave transmission, however it's a real long way to used in  practice.

With our technology, in 2006, three Chinese enterprises to enter the world top ten, marking the Chinese will become the world's new energy science and technology center. The world's extensive use of photovoltaic solar energy, leading to the current lack of the raw material supply and prices increase.we need to promote the technology, we must adopt a new technology, in order to substantially reduce costs for the long-term development of new energy sources.

The use of solar energy is divided into several main areas: families with small solar power station, and a large network of power plants, glass curtain wall building integrated photovoltaic, solar street lighting, street scenery each other, complementary scenery, such as power supply system, the main application for construction Systems integration and complementary scenery.

Principles of solar power generation

Solar cells is a light there and be able to respond to convert solar energy into electric power devices. Photovoltaic effect can produce many kinds

of materials, such as: monocrystalline silicon, polycrystalline silicon, amorphous silicon and gallium arsenide, indium selenium, such as copper.

Their power generation is basically the same principle.

Now we use crystal as an example to describe the process of generating light. P-type silicon crystal doped phosphorus available through N-type silicon, the formation of P-N junction. when the light of solar cells on the surface, was part of the silicon material to absorb photons; the photon energy transfer to the silicon atoms to make electronic transfers have taken place in Vietnam, a free e-P-N in the end both sides gathered to form a potential difference, when the external Access circuit, in the role of voltage, current will flow through an external circuit have a certain amount of output power. This process is essentially: photon energy into electrical energy.

Crystalline silicon solar cell production process

Silicon is the abundance of material on this planet to store . Since the 19th century, scientists have found a crystal silicon semiconductor properties, it has changed almost everything, even human thought. At end of the 20th century, figure and role of silicon can be seen everywhere our lives.Crystalline silicon solar cells to form the industrialization of the fastest in the last 15 years. Production process can be divided into five

steps: a) the process of purification b) the process of pulling rod c) the process of slicing d) the battery system Process e) the process of packaging.

The application of solar cells

In the 1960s, scientists have used solar space technology - satellite communication power supply. At the end of the century, constantly in the human soul-searching process, so that the photovoltaic power generation and clean forms of energy have direct more Cordial, not only in space applications in many fields is also to show their talents. Such as: solar energy courtyard, household solar power generation systems, the independent village

power supply systems, photovoltaic water pump (or irrigation water), communications power, oil pipeline cathodic protection, fiber optic communications pumping power, desalination systems, road signs in cities and towns , Highway signs, and so on. Europe and the United States and other advanced countries will be incorporated into the city photovoltaic power systems and remote areas in the natural world into the village power supply system development. And the construction of the solar system have been combined to form the trend of industrialization