We are concerned about solar cells in 2009

In the solar power system, the technology of the most complex part of the claim to be a solar cell. Solar power system solar cells is the core part of its development, production will directly affect the popularity and development of solar power.

The principle of solar cells can have the sun light in the semiconductor pn junction to form a new hole - electron pairs in the pn junction electric field, the hole flow from the p-n area, the flow of electrons from p-n area, then through the circuit after the formation of current. Solar power generation solar power in two ways, one is light - heat - electricity conversion, and the other is light - electric direct conversion.

solar cell

Tokyo, Japan in 2008, a solar show, a Japanese Industrial Technology Research Institute's staff show flowers and leaves are made into the shape of the solar cell model.

Review of the global development of solar cells

As early as 1839, French scientist Becquerel (Becqurel) discovered that light can make semiconductor material between different parts of the potential difference. This phenomenon became known as the "photovoltaic effect", referred to as "photovoltaic effect." In 1954, U.S. scientists Qiabin and Pirson Bell Laboratories in the United States made the first practical silicon solar cells, the birth of the solar energy into usable electrical energy photovoltaic power generation technology.

Since then, increasing the types of solar cells, growing a wide range of applications, and gradually expand the size of the market. To 1994, the world has reached sales of 64 megawatts of solar cells, showing the rapid development trend. In this century, some developed countries have developed, including solar cells, including the development of renewable energy projects. Research and production of solar cells in Europe, the Americas, Asia a large-scale roll out. Compete for the United States and Japan the world PV market dominance, introduced competing solar technology research and development projects. In recent years, production of solar cells worldwide average annual increase of nearly 40% of the total world production in 2003 has reached 744 MW.

Types of solar cells

According to the different materials used in solar cells can be divided into: 1, silicon solar cells; 2 to inorganic III-V compounds such as gallium arsenide, cadmium sulfide, copper indium selenium compounds such diverse materials of the battery; 3, features high Preparation of large molecular solar cells; 4, nanocrystalline solar cells.

Silicon is the ideal solar cell material, which is silicon-based solar cells to the main reason. In these cells the highest conversion efficiency of silicon solar cells, the most mature technology photoelectric conversion efficiency up to 23.3%. In the production process, the general texture of the surface, emitter passivation, area doping technology. However, due to silicon material prices and the corresponding impact complicated process, the cost of high price of silicon, dramatically reducing the cost is very difficult, can not achieve the massive popularity of solar power.

With the continuous development of new materials and related technology, in other village-based solar cell materials have shown more and more attractive prospects. The international low-cost mass production technology research focused on polycrystalline silicon, amorphous silicon large area thin film, CdTe cells, CIS cells manufacturing technology, 鈪?V compound semiconductors and efficient solar cells, amorphous silicon and crystalline silicon thin film photovoltaic cell hybrid and so on.

If silicon is characterized by high efficiency, high cost, the problem of other materials is undoubtedly the low-cost battery, transforming weak. Compared with the single crystal silicon solar cells, in addition to silicon, cadmium telluride loaded with other materials, the photoelectric conversion efficiency of the battery generally does not exceed 15%.

The development of solar cells

Began to study in China in 1958, solar cells, first used in 1971, China launched a satellite. 1973 will be used for terrestrial solar cells. As a result of price and output restrictions, market development is very slow, except as satellite power, solar cells on the ground only for a small power supply systems, such as beacon lights, railway signal systems.

In 2002, the state ministries launched the "Western Provinces Rural without electricity power scheme", by PV and small wind power to solve seven provinces in the western town without electricity electricity problems. The start of this project greatly stimulate the solar power industry, China has built several solar cell packaging line, so that the production of solar cells is increasing rapidly.

At present solar cells already widely used in communication, transportation, consumer products and other fields, the inclusion of photovoltaic power generation not only to national research programs, and included in the national electric power construction program, but also in a number of major projects in the applications. The end of 2003, China's total installed capacity of solar cells to 5 thousands. At present, the photovoltaic power generation has been throughout the western provinces of China, and parts of central and eastern provinces, municipalities and autonomous regions, the total size of investment has more than 30 billion yuan.

Efficient and cheap solar cells unity has always been the goal of international development. And the same, our products, promote the fundamental problem assembly here. Grasslands, islands, deserts and other areas without electricity huge demand, but the price affordability, lack of production scale and product specific weaker and other issues is very conspicuous. Power system in the city, the high cost of investment is no doubt one more product promotion more difficult. Therefore, improve efficiency, reduce costs and expand the scale of development should be present, production of solar cells subject.

In 2008, the global financial crisis also spread to China's solar cell industry, polysilicon prices fall to record low competition level of play, the original "blue skies" of the solar cell industry, all of a sudden "dark clouds", the crisis had led many companies to cut production layoffs and other ways to deal with, but I believe that the use of solar energy photovoltaic power generation is irreversible trend. China has become the world's second largest after the U.S. consumer market, electric power demand growth rate was highest in the world. The tension of oil energy, coal resources make the existing emergency power generation can not meet the power consumption, the promotion of solar energy demand in China is still a pressing need, the market potential is huge. For the market to accelerate the development of solar cell industry will have bright prospects.

 

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