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Serrated cathode dissolution under high current density: Morphology and root cause
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10.1063/1.4813118
/content/aip/journal/jap/114/5/10.1063/1.4813118
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/5/10.1063/1.4813118
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Cross-sectional micrograph showing a typical serrated interface due to excessive cathode dissolution. This joint is stressed with a current density of 4.5 × 10 A/cm at 50 °C for 1000 h. The electrons flow upward. (b) Schematic illustration showing one of the possible three-dimensional morphologies: rod-like dissolution. (c) Schematic illustration showing another possible three-dimensional morphology: thin-plate dissolution.

Image of FIG. 2.
FIG. 2.

(a) Schematic drawing showing the flip chip solder joint used in this study. (b) Micrograph showing the as-assembly joint before current stressing.

Image of FIG. 3.
FIG. 3.

Schematic drawing showing the temperature control setup used in this study.

Image of FIG. 4.
FIG. 4.

Micrograph showing a joint that has been stressed with 4.5 × 10 A/cm at 50 °C for 1500 h.

Image of FIG. 5.
FIG. 5.

(a) Schematic illustration showing the layer-by-layer polishing used in this study. (b) Drawing the relation between the distance to center line, d,and the width of the opening of a cross section, w.

Image of FIG. 6.
FIG. 6.

(a)–(h) Cross-sections of the same joint that has been stressed with 4.5 × 10 A/cm at 50 °C for 1500 h. These eight cross sections are from the same joint but with different d values. Electrons entered the joint from the lower side and exited through the upper side.

Image of FIG. 7.
FIG. 7.

(a) Micrograph showing the entire joint for the region shown in Fig. 6(b) . (b) Micrograph showing the entire joint for the region shown in Fig. 6(c) .

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/content/aip/journal/jap/114/5/10.1063/1.4813118
2013-08-07
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Serrated cathode dissolution under high current density: Morphology and root cause
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/5/10.1063/1.4813118
10.1063/1.4813118
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