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The impact of wafering on organic and inorganic surface contaminations
Meyer, S.,Wahl, S.,Timmel, S.,Kopge, R.,Jang, B.Y. New York] ; North-Holland 2016 APPLIED SURFACE SCIENCE - Vol.378 No.-
Beside the silicon feedstock material, the crystallization process and the cell processing itself, the wafer sawing process can strongly determine the final solar cell quality. Especially surface contamination is introduced in this process step because impurities from sawing meet with a virgin silicon surface which is highly reactive until the oxide layer is formed. In this paper we quantitatively analysed both, the organic and inorganic contamination on wafer surfaces and show that changes of process parameters during wafering may cause dramatic changes in surface purity. We present powerful techniques for the monitoring of wafer surface quality which is essential for the production of high efficiency and high quality solar cells.