Ultrashort pulse laser scribing of CIGS-based thin film solar cells

Giovanardi, Fabio; Bissoli, F.; Gilioli, E.; Trevisi, Giovanna; Mazzer, M.; Selleri, Stefano

doi:10.1109/icop49690.2020.9300313

Cited by 2 publications

(1 citation statement)

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“…In addition to advantages such as manufacturing accuracy, controllability, and high power of laser beam, laser scribing provides more other benefits than mechanical scribing to produce CIGS cells. The loss of power generation that occurs by the mechanical scribing method is reduced using laser scribing; so, an increase in solar cell efficiency is achieved [9], [10]. This occurs since layers between deposition processes are removed by the laser and monolithic cell-to-cell interconnections are created, resulting in minimal productive area loss [11].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Monitoring and Defect Detection of Laser Scribing Process of CIGS Solar Panels Utilizing Photodiodes

et al. 2022

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Laser scribing is developing rapidly in industrial applications as a method of material processing, especially in areas that require high levels of precision. This technology provides functionality and efficiency improvements in the manufacturing of solar panels. Due to the premium quality and speed requirements of the laser scribing technology, monitoring of this process in real-time is critical in order to promptly detect defects in the manufacturing process. However, common monitoring systems have been developed for other laser processes, like laser welding, which are noticeably slower than the laser scribing process. The goal of this research was to investigate the possibility of using photodiodes for real-time monitoring of the laser scribing process for Copper Indium Gallium Selenide (CIGS) solar panels. Various monitoring setup configurations were designed, developed, and examined to determine the viable option for implementation as a defect detection platform. Using different photodiode positions, the intensity of the light and the photodiode induced voltage for diffuse and specular reflections were tested, and the practical pros and cons of applying each configuration were analyzed. The capability of the monitoring system to distinct the different layers of the scribed CIGS cell was also examined to assess the penetration depth of the scribe. In addition, by performing several experiments with different scribe thicknesses and analyzing oscilloscope measurements, the optimal placement of the photodiode for accurate tracing of the scribing path was determined and verified. Key aspects of development of such monitoring system for solar panel applications were identified through this research.

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Section: Introductionmentioning

confidence: 99%