The evolution of interfacial microstructure of Sn3.5Ag solder bump with Cu under-bump metallization

Low cost electrodeposited Sn3.5Ag solder bumps fabrication technology was developed for three-dimensional packaging applications. Effect of reflow time on interfacial reaction of electroplated Sn3.5Ag solder bumps with Cu under-bump metallization (UBM) was investigated. The microstructure of eutecti...

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Hauptverfasser: Jinglin Bi, Anmin Hu, Ming Li, Dali Mao
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Anmin Hu
Ming Li
Dali Mao
description Low cost electrodeposited Sn3.5Ag solder bumps fabrication technology was developed for three-dimensional packaging applications. Effect of reflow time on interfacial reaction of electroplated Sn3.5Ag solder bumps with Cu under-bump metallization (UBM) was investigated. The microstructure of eutectic Sn3.5Ag is composed of β-Sn phase and Ag 3 Sn IMCs in the solder region. At the interface between solder and Cu, scallop-like Cu-Sn IMCs were formed toward solder region and were identified as Cu 6 Sn 5 IMCs by compositional measurement of EDX. XRD measurement identified that Cu 6 Sn 5 and Ag 3 Sn formed after reflowing for lmin, and as the reflow time extended the quantity of Ag 3 Sn almost remained the same while the quantity of Cu 6 Sn 5 increased. No Cu 3 Sn was detected, even after reflowing for 20min. EDX analysis was consistent with the XRD result.
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Effect of reflow time on interfacial reaction of electroplated Sn3.5Ag solder bumps with Cu under-bump metallization (UBM) was investigated. The microstructure of eutectic Sn3.5Ag is composed of β-Sn phase and Ag 3 Sn IMCs in the solder region. At the interface between solder and Cu, scallop-like Cu-Sn IMCs were formed toward solder region and were identified as Cu 6 Sn 5 IMCs by compositional measurement of EDX. XRD measurement identified that Cu 6 Sn 5 and Ag 3 Sn formed after reflowing for lmin, and as the reflow time extended the quantity of Ag 3 Sn almost remained the same while the quantity of Cu 6 Sn 5 increased. No Cu 3 Sn was detected, even after reflowing for 20min. 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Effect of reflow time on interfacial reaction of electroplated Sn3.5Ag solder bumps with Cu under-bump metallization (UBM) was investigated. The microstructure of eutectic Sn3.5Ag is composed of β-Sn phase and Ag 3 Sn IMCs in the solder region. At the interface between solder and Cu, scallop-like Cu-Sn IMCs were formed toward solder region and were identified as Cu 6 Sn 5 IMCs by compositional measurement of EDX. XRD measurement identified that Cu 6 Sn 5 and Ag 3 Sn formed after reflowing for lmin, and as the reflow time extended the quantity of Ag 3 Sn almost remained the same while the quantity of Cu 6 Sn 5 increased. No Cu 3 Sn was detected, even after reflowing for 20min. EDX analysis was consistent with the XRD result.</abstract><pub>IEEE</pub><doi>10.1109/ICEPT.2011.6066855</doi><tpages>5</tpages></addata></record>
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subjects Copper
Metallization
Microstructure
Packaging
Silver
Tin
X-ray scattering
title The evolution of interfacial microstructure of Sn3.5Ag solder bump with Cu under-bump metallization
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