標題: ESPI Solution for Defect Detection in Crystalline Photovoltaic Cells
作者: Yin, Ching-Chung
Wen, Tzu-Kuei
機械工程學系
Department of Mechanical Engineering
關鍵字: Defect detection;photovoltaic cell;electronic speckle pattern interferometry;thermal deformation
公開日期: 2011
摘要: The yield of photovoltaic (PV) cells is often reduced by micro-defects in crystalline silicon substrates during fabrication. Common optical inspection for a thin crack in such a large silicon photovoltaic cell is extremely time-consuming and fails in efficiency. This study developed a method of using electronic speckle pattern interferometry (ESPI) for rapidly testing for cracks in an entire field of PV cells. Thermally induced flexural cell deformation was measured by optical configuration for ESPI measurement of out-of-plane deformations. Experimental results indicate that the speckle patterns correlating with thermal deformation of cell enable simultaneous estimation of crack size and location in both single- and poly-crystalline PV cells. This nondestructive detection method has potential applications in PV cell sorting.
URI: http://hdl.handle.net/11536/15096
http://dx.doi.org/10.1117/12.905261
ISBN: 978-0-81947-940-2
ISSN: 0277-786X
DOI: 10.1117/12.905261
期刊: SEVENTH INTERNATIONAL SYMPOSIUM ON PRECISION ENGINEERING MEASUREMENTS AND INSTRUMENTATION
Volume: 8321
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