{"product_id":"pv06000-semi-pv60-test-method-for-measurement-of-cracks-in-photovoltaic-pv-silicon-wafers-in-pv-modules-by-laser-scanning","title":"PV06000 - SEMI PV60 - Test Method for Measurement of Cracks in Photovoltaic (PV) Silicon Wafers in PV Modules by Laser Scanning","description":"\u003cp dir=\"ltr\" align=\"justify\"\u003eThis Standard was technically approved by the Photovoltaic – Materials Global Technical Committee. This edition was approved for publication by the global Audits and Reviews Subcommittee on November 11, 2014. Available at www.semiviews.org and www.semi.org in January 2015.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eMulticrystalline and monocrystalline silicon wafers for photovoltaic (PV) cells are manufactured by casting, Czochralski technique or other controlled solidification methods.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eIn PV cell fabrication process using these silicon wafers, macroscopic defects such as chips, scratches, and cracks are often generated due to mechanical and thermal stresses. Chips and scratches can be origins for crack generation.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eCracked wafers are sometimes broken in module fabrication process causing lower productivity and cost increases. Also broken wafers in a module may result in degradation of the module reliability.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eTherefore, in-line characterization methods are required that allow discriminately inspecting cracks with high through put and repeatability, and that measure the number and the length of those.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eThis method is based upon the measurement of laser beam induced current (LBIC) and can detect only cracks in wafers of a module by controlling bias voltage applied to the module.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eThis Test Method identifies and measures cracks in crystalline silicon wafers of a module.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eThis Test Method employs an in-line, noncontacting and nondestructive method for characterizing multi- and monocrystalline silicon wafers of a module supported by a mechanism that moves the test specimen through the measurement equipment.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eThis Test Method covers square and pseudo-square silicon wafers of PV cells with nominal edge length ≥125 mm and a nominal thickness ≥100 µm.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eIt is more effective to operate this Test Method under the statistical process control (SPC) [e.g., ISO 11462] to obtain the data with high reliability and repeatability.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eThis Test Method detects cracks from the distribution of leakage current density on the PV cell obtained by scanning its front side by laser.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eOther measurement methods may also provide similar information about the number and the length of cracks of wafers with this Test Method. Their subjects are, however, different from that of this Test Method.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"justify\"\u003eThis Test Method is also applicable to off-line measurement provided that the requirements of the test method are satisfied.\u003c\/p\u003e \u003cp dir=\"ltr\" align=\"left\"\u003e\u003c\/p\u003e\u003cp dir=\"ltr\" align=\"justify\"\u003e　\u003c\/p\u003e\u003cb\u003eReferenced SEMI Standards\u003c\/b\u003e\u003cbr\u003e\u003cp\u003eSEMI E89 — Guide for Measurement System Analysis (MSA)\u003cbr\u003e SEMI M59 — Terminology for Silicon Technology\u003cbr\u003e\u003c\/p\u003e","brand":"semi.org","offers":[{"title":"SEMI PV60-0115 - Current","offer_id":40234315251779,"sku":"5306","price":31900.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0567\/3402\/3747\/files\/PVVolume_39dca468-ddbb-40c3-9e03-9a216147765c.png?v=1776702432","url":"https:\/\/store-dev2.semi.org\/en-jp\/products\/pv06000-semi-pv60-test-method-for-measurement-of-cracks-in-photovoltaic-pv-silicon-wafers-in-pv-modules-by-laser-scanning","provider":"SEMI Dev 2","version":"1.0","type":"link"}