Polycrystalline Solar Cells production process and monocrystalline silicon solar cell almost, but the Polycrystalline Solar Cells photoelectric conversion efficiency will have to reduce a lot of its photoelectric conversion efficiency of about 12%. From the production cost, 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 Polycrystalline Solar Cells life than monocrystalline silicon solar cells shorter.
Polycrystalline Solar Cells 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 solar cells is also made of solar, solar components constitute a low utilization of the plane. Therefore, since the 80s, some countries in Europe and America has invested in the development of polycrystalline silicon solar cells.
Polycrystalline silicon solar cell 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. A portion of the electrons that are absorbed by the battery are excited by the absorbed light to excite the electrons in the high-energy state of the bounds,Polycrystalline Solar Cells making it free electrons moving in the crystal in the directions, leaving the remaining holes (before the electrons). The holes also drift around the crystal, and the free electrons (-) converge at the N junction, and the holes (+) are clustered at the P junction, and when the external loop is closed, the current is generated
Characteristics of Polycrystalline Silicon Solar Cells
① has a stable and efficient photoelectric conversion efficiency.
② surface covered with blue silicon nitride anti-reflective film, the color uniform and beautiful.
③ high-quality silver and silver aluminum slurry, to ensure good conductivity, reliable adhesion and good electrode solderability.
④ high-precision screen printing graphics and high flatness, making the battery easy to automatic welding and laser cutting.