Dr. Gregory B. Lush Profile

Dr. Gregory B. Lush

at Univ of Texas at El Paso

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Proceedings Article | 21 March 2000 Paper

Machine vision for solar cell characterization

Miguel Ordaz, Gregory Lush

Proceedings Volume 3966, (2000) https://doi.org/10.1117/12.380078

KEYWORDS: Electroluminescence, Solar cells, Image segmentation, Image processing, Binary data, Cameras, Machine vision, Visualization, Thin films, Manufacturing

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An in-line, non-destructive process is being developed for characterizing polycrystalline thin-film and other large area electronic devices using computer vision based imaging of the manufacturing and inspection steps during the device fabrication process. This process is being applied specifically to Cadmium Telluride/Cadmium Sulfide (CdTe/CdS) thin film, polycrystalline solar cells. Our process involves the acquisition of reflective, transmission and electroluminescence (EL) intensity images for each device. The EL intensity images have been processed by use of a modified median cut segmentation. The processed images reveal different gray level regions corresponding to different intensities of EL originating from radiative recombination events occurring within a biased solar cell. Higher efficiency devices show a more uniform intensity distribution in contrast with lower efficiency devices. The uniform intensity regions are made up of gray level intensity values found near the mean of the histogram distribution these are identified as regions of good device performance and are attributed to better material quality and processing. Low intensity regions indicate either material defects or errors in processing. This novel characterization process and analysis are providing new insights into the causes of poor performance in CdTe-based solar cells.

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