NIR-spectroscopical process control for wet chemical processes

Crystalline silicon solar cell fabrication requires many wet chemical processes, such as alkaline and acidic texturisation processes as well as several cleaning procedures. Besides the conventional chemical analysis techniques like titration and chromatography, near-infrared (NIR) spectroscopy gains more and more importance. In this paper, the suitability of NIR spectroscopy for the process control in wet chemical processes is compared to alternative analysis methods like titration, ion chromatography, HPLC and surface tension measurements.