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Analysis of metal impurities in wet chemical processes by ICP OES and AAS
|Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:|
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
|European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>|
| Conference Paper|
|Fraunhofer ISE ()|
The monitoring of the chemical solutions is important for high efficiency cell processing. In solar cell industry, the possible contamination of wet chemical bathes for texturing and cleaning with trace impurities is not yet studied intensively. Questions concerning the desired bath purity or the maximum impurity load of the cleaning bath can only be answered empirically. This paper gives an overview of possible measurement techniques and tools for qualification of the cleaned surface itself as well as for controlling the relevant impurities in the cleaning solutions. Atomabsorption spectrometry and emission spectrometry to analyse impurities in wet chemical solutions are described. The correlation between metal impurities and the lifetime are shown.