Featured in India's solar horizon – 08-2011

Precision coating

Selective emitter process: The thin, uniform application of dopants is critical to the successful formation of selective emitters on photovoltaic cells. Considerable effort is ongoing to improve the efficiency of photovoltaic cells. Recently, much attention has been given to the formation of selective emitters to significantly improve the efficiency of the solar cell. In the second part of a two-part article, Ultrasonic Systems’ President Stuart Erickson and Chinalight Solar’s Senior Engineer Yang Song, Deputy Director of Research and Development Ye Duan, and Deputy General Manager Youzhong Li elaborate.

The dual precision metering pump liquid delivery system, as shown in the graph “Precision metering pump liquid delivery system,” consists of a PFA reservoir to store the liquid dopant, two servo-driven positive displacement metering pumps, and flow control valves. The dopant in the metering pump is delivered to the spray head by the positive displacement …

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