Real-time monitoring of laser scribing process of CIGS solar panel utilizing integrated redundant sensory platform utilizing of high-speed camera and spectrometer

Abstract

The purpose of this master’s thesis and the research conducted is about the structure of solar cells, especially copper indium gallium selenide (CIGS) thin film solar cell. The most critical task in the production of thin film solar cell is the scribing phase, where the scribing of the material layer without penetrating under the layers of material substance. The accuracy and fast production of solar cells requires detailed and continuous monitoring of the scribing process. For this reason, a laboratory study was conducted for this master’s thesis in improving the monitoring of the scribing process using an ultrafast laser and two monitoring sensors. In improving the scribing process, a nanosecond pulse laser was configured to scribe the top layer of backside of mirror while the high-speed video camera monitored co-axially and the spectrometer monitored the laser scribing process off-axially. As a result, the accuracy of the laser scribing process of one material layer and the monitoring of the process was improved considering non-damaging under layers.