In increasing the efficiency of photoelectric conversion of solar cells, more and more people began to pay attention to polycrystalline ingots. This paper analyzes and contrasts the different aspects of polycrystalline ingot ingot furnace structure itself, optimization of ingot process and auxiliary materials, and puts forward a method to improve the efficiency of solar cells.
Polycrystalline silicon direction is better, can be multi-directional to accept the light. We can make a simple experiment: with a hand to block the sun to the solar panel to leave a shadow, so we will be very easy to find the Polycrystalline Solar Cells to reduce the power generation is not very obvious, and monocrystalline silicon power generation The amount of current is reduced is quite obvious.
Polycrystalline solar panels with the battery, the sun shines on the solar cell plate current generated by the inverter controller to charge the battery, the battery through the inverter controller into a DC or AC for electrical (load) use, or through Grid-connected inverter directly into the power grid. Solar photovoltaic system consists of solar cells (group), solar controller, battery (group), such as the output power for the AC 220V or 110V also need to configure the inverter.
Monocrystalline silicon crystal structure is relatively perfect: less impurities, high purity; high and low sub-life; no dislocation defects and resistivity easy to control, from the efficiency of the above words monocrystalline silicon unit non-silicon cost has been close to the polycrystalline ingot , But there are significant differences in conversion efficiency. Conversion efficiency as the most important reference data in the evolution of silicon-based semiconductor cells and the most dependent on the practical power generation process, even if the slight difference is enough to cause a large gap. And from the system's energy return point of view, the conversion efficiency of the difference between the single crystal silicon photovoltaic system has created a higher power return, this advantage determines the long-term value of monocrystalline silicon power higher. From the cost of the above point of view, with the monocrystalline silicon battery research progress brought about by the cost reduction, and still continue to reduce, Polycrystalline Solar Cells proud of the price advantage has ceased to exist. This situation will bring the role of monocrystalline silicon cells and Polycrystalline Solar Cells battery conversion.
The crystallization rate of silicon depends on the cooling rate of the graphite block at the bottom. The better crystallization rate will produce stable rate of segregation and ensure the uniform precipitation of impurities. It is the only way to grow high-efficient Polycrystalline Solar Cells blocks. The current cooling industry, including the upgrading of the insulation cage, the cooling plate down, the bottom of the three water cooling mode.
Air-cooled technology has its own unique advantages compared with the current existing, will rely on mobile insulation cage before the passive DS block radiation cooling weak control mode to DS block at the bottom of the active gas cooling strong control mode, making crystal growth control Stronger sex. Through the hollow DS block, gas cooler, pump, inverter and other components of the closed gas flow controllable gas flow to the flow of DS block on the direct cooling, and through the DS table temperature feedback to adjust the pump motor speed Control the cooling gas flow, in order to achieve accurate temperature control of the DS table.
With gas temperature, flow and wide flow range, high precision adjustment, and low power consumption advantages. So that the interface of silicon ingot growth more stable, improve the efficiency of the conversion of the battery.