標題: Crack detection in photovoltaic cells by interferometric analysis of electronic speckle patterns
作者: Wen, Tzu-Kuei
Yin, Ching-Chung
機械工程學系
Department of Mechanical Engineering
關鍵字: Crack detection;Electronic speckle pattern interferometry;Photovoltaic cell;Crystalline silicon
公開日期: 1-三月-2012
摘要: Cracking is a common problem encountered during the fabrication of crystalline silicon photovoltaic (PV) cells. In this study, electronic speckle pattern interferometry (ESPI) is developed as a tool for rapid identification of cracks in PV cells. Thermally induced cell deformation of defect-free and defect-bearing PV cells was first modeled with numerical simulations and then experimentally studied by optical configuration for ESPI measurement of out-of-plane deformations. Both numerical and experimental results indicate that the speckle patterns imparted during thermal deformation of a cell allow for simultaneous quantification of crack size, location and type in both single- and poly-crystalline PV cells. Speckle patterns near defects were manifested as continuous, chevron-shaped, and broken fringes for scratch, surface cracks, and through cracks, respectively. For comparison to other existing techniques, full field electroluminescent images were also provided for every defective PV cell. Electroluminescent imaging is capable of detecting cracks, but unlike ESPI, is unable to distinguish between the different types of cracks. Because the amount of heating needed to induce out-of-plane deformation resolvable by ESPI is small (<0.5 degrees C) and because ESPI is sensitive to crack type, the ESPI-based imaging study presented here can potentially be developed into a rapid, non-destructive inspection tool for the structural integrity of solar cells at any point within the manufacturing process. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.solmat.2011.10.034
http://hdl.handle.net/11536/15600
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2011.10.034
期刊: SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume: 98
Issue: 
起始頁: 216
結束頁: 223
顯示於類別:期刊論文


文件中的檔案:

  1. 000300536500030.pdf