Solar cell development potential
Solar cell industry will be great
The main principle of solar cells is through the use of semiconductor materials, A thinner N-type semiconductor is placed on a thicker P-type semiconductor, When the photon strikes the surface of the device, P-type and N-type semiconductor junction surface with electron diffusion to produce current, Can use the upper and lower ends of the metal conductor will lead to the use of current.
Types of solar cells Depending on the material used, Solar cells can be divided into: 1, silicon solar cells; 2, inorganic salts such as gallium arsenide III-V compounds, cadmium sulfide, copper indium selenium and other multi-compound materials for the battery; 3, functional polymer materials prepared solar cells ; 4, nano-crystal solar cells.
Silicon is the ideal solar cell material, This is the main reason for solar cells to silicon-based.
In the above battery monocrystalline silicon solar cell conversion efficiency of the highest,
Technology is also the most mature, Photoelectric conversion efficiency of up to 23.3%.
In the production process, the general use of surface texture, the launch zone passivation, partition doping and other technologies. But because of the price of monocrystalline silicon material and the corresponding cumbersome process, Monocrystalline silicon cost of high prices, Significantly reduce costs is very difficult, Can not achieve the large-scale popularization of solar power.
With the continuous development of new materials and related technology development,
Other materials based on solar cells are increasingly showing attractive prospects.
The current international low-cost large-scale production technology research focused on polysilicon, large area thin film amorphous silicon, CdTe battery, CIS battery manufacturing technology, III-V compound semiconductor high-efficiency photovoltaic cells, Amorphous silicon and crystalline silicon hybrid thin film photovoltaic cells and so on.
If monocrystalline silicon is characterized by high efficiency, high cost, Other materials battery problems is undoubtedly low cost, weak conversion. Compared with monocrystalline silicon solar cells, in addition to polysilicon, cadmium telluride, etc., Other materials, the battery photoelectric conversion efficiency is generally not more than 15%.
China's solar cell development in China in 1958 began to study solar cells, In 1971 for the first time on the launch of China's satellite. In 1973 began to use solar cells on the ground.
Due to price and production constraints Market development is very slow, In addition to being used as a satellite power source, solar cells on the ground are used only for low power power systems such as navigation lights and railway signaling systems.
In 2002, the relevant state ministries and commissions launched the "no electricity in the western provinces power plan" Through the photovoltaic and small wind power to solve the western provinces and autonomous regions without electricity problems. The start of this project greatly stimulated the solar power industry, China built a few solar cell packaging line, So that the annual production of solar cells increased rapidly.