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Development Status of HIT Solar Cellsc
Nov 02, 2017

The sun is the center of the solar system, is the nearest star from the Earth, its internal thermonuclear reaction, the stability of the radiation to the space, the total radiation power of about 3.8 * 1026J.s-1, to reach the Earth's total radiation Energy is estimated to be about 1.73 * 1017J.s-1, reaching the surface of the land capacity of about 1.7 * 1016J.s-1, equivalent to the global consumption of the total energy of 3.5 million times a year, we can see that the sun to the Earth's energy is Very large, which has become the future direction of human energy development one of the main.

Solar cells, is based on the photovoltaic effect developed a photoelectric conversion device, a few days ago the international PV market, solar cells are mainly crystalline silicon (including monocrystalline silicon, polysilicon), amorphous / single crystal heterojunction (HIT), Amorphous silicon thin film, cadmium telluride (CdTe) thin film and copper indium selenium (CIS) thin film solar cells. The commercially available crystalline silicon solar cells still account for the mainstream, the photoelectric conversion efficiency has reached 25%, the calculated conversion efficiency limit of 31%, but by the material purity and preparation process constraints, it is difficult to improve its conversion efficiency or Reduce the cost; and amorphous silicon solar cell although a large area of production, cost and low, but its conversion efficiency is still relatively low, and poor stability.

Currently on the market HIT silver paste common for the Japanese imports of silver paste, the domestic HIT with silver slurry research and development is more backward, the main reason is that the domestic HIT battery industry is still the development of various companies, colleges and universities into the development of energy Second, HIT silver paste itself has high technical barriers, HIT battery due to its process temperature limit, and the traditional thermal diffusion type crystalline silicon solar cell electrode paste (800 ℃ or so sintering) is different from the electrode production Also need to be carried out at about 200 ℃, requiring it to have a high conductivity, while the contact resistance between the TCO film and low, but also requires its high welding tension.


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