Sn/Co solid/solid interfacial reactions

Peltier Effect on Sn/Co Interfacial Reactions

“…19 The reaction layer formed in the second stage was between Co and the layer formed in the first stage, which can be seen as a marker layer, indicating that Sn was also the dominant diffusion species in the Sn/Co interfacial reactions under current stressing. As shown in Fig.…”

“…18,19 Since the effective charge of Sn is negative, 3,4 the direction of the Sn flux resulting from electromigration is in the direction of electron flow, and it should be the same as that of Sn fluxes from chemical potential gradients at the left-side cathode interface. Thus, even if the growth of the CoSn 3 phase is influenced by the electromigration effect, the reaction layer at the cathode side should be thicker because the two Sn fluxes are in the same direction.…”

“…The results are similar to those without the passage of an electric current. 19 It is observed that the CoSn 3 layer at the Co/Sn anode interface with electrons passing from Co to Sn was thicker than that at the Sn/Co cathode interface. The reaction layer thickness at the Co/Sn anode and Sn/Co cathode interfaces were 24.0 lm and 16.9 lm, respectively, and the ratio was 1.42.…”

“…[13][14][15][16][17] Research on Sn/Co interfacial reactions is relatively scarce in the literature. [13][14][15][16][17][18][19] The reaction phase is the CoSn 3 phase. Its growth was reaction-controlled in the early stage, and the CoSn 3 phase grew linearly with reaction time until it reached 87 lm.…”

“…Its growth was reaction-controlled in the early stage, and the CoSn 3 phase grew linearly with reaction time until it reached 87 lm. 19 Since the Sn/Co interfacial reaction is reactioncontrolled in the early stage, the electromigration effect is less likely to affect the interfacial reactions and the growth of the reaction phase should be similar with and without the passage of electric current. 3,4 However, a preliminary study of a Sn/Co/Sn sample revealed a different trend.…”