Figure 3.

Design optimization of composite encapsulation, guided by numerical and experimental results. a) Elastic stretchability of interconnect with different thicknesses of core (Silbione) and shell (Ecoflex) constituents in the encapsulation. b–d) FEA and optical images of deformed interconnects with three representative encapsulation strategies. The combination “thin Silbione, thin Ecoflex” (b) provides better stretchability than “thick Silbione, thin Ecoflex” (c) or “thin Silbione, thick Ecoflex” (d). The deformed interconnects were all stretched toward their elastic stretchabilities. The color in FEA images denotes the maximum principal strain in metal. (Scale bars: 100 μm).