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					Sapphire unique nature determine its widely used, but high-quality sapphire is difficult to get. As we know, sapphire seed crystal growth has a direct impact, but have become a key factor to grow high quality crystals

					Sapphire surface defects and dislocations seriously affect the quality of crystal growth of subsequent epitaxial layers, thus affecting the LED luminous efficiency and lifetime.

					PL detection system can monitor all processes in the solar cell manufacturing and gives accurate analysis possibility to the technology problems.