Ag Electromigration Against Electron Flow in Sn5Ag/Cu Solder Bump

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Title:	Ag Electromigration Against Electron Flow in Sn5Ag/Cu Solder Bump
Authors:	Tseng,HW;Yeh,YT;Lin,KY;Liu,CY
Contributors:	化學工程與材料工程學系
Keywords:	COPPER;JOINTS;ALLOY;FILMS
Date:	2009
Issue Date:	2010-06-29 17:26:23 (UTC+8)
Publisher:	中央大學
Abstract:	A phenomenon that can result in electromigration suppression in solder bumps on Cu pads is reported. Under certain current stressing conditions, Ag migrates against the electron flow and forms a Ag3Sn compound layer at the cathode Sn5Ag/Cu interface. This phenomenon implies that it is the electrostatic force rather than the typical wind force that is the dominant electromigration force acting on the Ag solute atoms in the Sn matrix. The Ag3Sn compound layer formed at the Sn5Ag/Cu joint interface could effectively retard electromigration-induced consumption on the Cu bump pad. (C) 2009 The Electrochemical Society. [DOI:10.1149/1.3236787] All rights reserved.
Relation:	ELECTROCHEMICAL AND SOLID STATE LETTERS
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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