Polycrystalline Solar cell production process and monocrystalline silicon solar cell almost, but the polysilicon solar cell photoelectric conversion efficiency will have to reduce a lot of its photoelectric conversion efficiency of about 12%. From the cost of production, than the monocrystalline silicon solar cells to be cheaper, easy to manufacture materials, saving power consumption, the total cost of production is low, so get a lot of development. In addition, the polysilicon solar cell life than monocrystalline silicon solar cells shorter. Polysilicon solar cell production requires the consumption of a large number of high-purity silicon material, and the manufacture of these materials complex process, power consumption is large, in the total cost of solar cell production has exceeded one-half. Combined with the drawn single crystal silicon rod was cylindrical, sliced production of solar cells is also a wafer, composed of solar components flat utilization is low. Therefore, since the 80s, some countries in Europe and America has invested in the development of Polycrystalline Solar Cells.
Polycrystalline Solar Cells chip is a photoelectric effect of the semiconductor device, the semiconductor PN junction is generated after the light flow, when the light direct solar cell chip, part of which is reflected, part of the absorption. Part of the through the battery chip, the absorption of light to stimulate the high energy level of the bound state of the electrons, making it free electrons, these free electrons in the crystal to move in all directions, the remaining holes. The holes also drift around the crystal, and the free electrons (-) converge in the N junction, and the holes (+) are converged at the P junction, and when the external loop is closed, the current is generated.
Characteristics of Polycrystalline Solar Cells
① has a stable and efficient photoelectric conversion efficiency. The following are the same as the "
② surface covered with blue silicon nitride anti-reflective film, the color uniform and beautiful. The following are the same as the "
③ high-quality silver and silver aluminum slurry, to ensure good conductivity, reliable adhesion and good electrode solderability. The following are the same as the "
④ high-precision screen printing graphics and high flatness, making the battery easy to automatic welding and laser cutting.