SEM images of IMCs features and distributions: (a) Cu/In-Sn couple after
2 h; (b) Ni/In-Sn couple after 24 h; (c) Pt/In-Sn couple after
3 weeks;
(d) Ti/In-Sn couple after 96 h; (e) V/In-Sn couple after 12 days;
and (f) Nb/In-Sn couple after 3 months.