Functional Properties Of Electrically Conductive Adhesives As Interconnect Materials

Sow, Jin Huat (2019) Functional Properties Of Electrically Conductive Adhesives As Interconnect Materials. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The use of electrically conductive adhesive (ECA) been expanded widely in microelectronics industry. ECA is to replace solder with beneficial advantages in fastening and brazing, sealing, interconnection, electrical shielding and eco-friendly with elimination of lead usage and reduce flux cleaner, due to increasing awareness to the environment increased as the traditional solder no longer fulfil the increase of miniaturization of electronic device or product and contain toxic lead, harmful to human and hazardous material. This research is focused on the functional properties of electrically conductive adhesives as interconnect materials. In this research, hybrid electrically conductive adhesive was formulated by adding 5 wt.% silver flakes (Ag) and multi walled carbon nano-tubes (MWCNT) with filler loading 5 wt.%, 6 wt.% and 7 wt.% to the epoxy matrix in a centrifugal mixer, Thinky mixer ARE-310 machine. One of the objectives of this research is to establish a lower percolation threshold for electrically conductive adhesive with varying filler loading. The second objective is to investigate the effect of hybridizing the fillers on the mechanical performance of hybrid electrically conductive adhesives. With reference to ASTM F390 standard guideline, JANDEL model RM3000+, a 4-point probe was used to measure the resistivity of printed hybrid ECA, in which each sample was tested for 3 times to get reliable set of data. The mechanical performance is evaluated in term of the lap shear strength of the hybrid ECA as ASTM D1002. The experiment results from electrical characterization suggest that the sheet resistivity gradually reduced (an indication of increasing electric conductivity) from 5 wt.% up to 7 wt.% of the MWCNT which then plateaued, a possible indication of percolation threshold, that is associated with better conductive path between the Ag-MWCNT hybrids fillers in the hybrid ECA. Here, the sheet resistivity is stabilized at 0.45kW/sqr. However, in term of the lap shear strength there is a decrease in the value with increasing MWCNT filler loading, from 8.61 MPa down to 7.03 MPa. At 5 wt.% the hybrid ECA exhibit a combination of cohesive-adhesive failure, in which the hybrid ECA is retained at both sides. However, at 7wt% MWCNT, the hybrid ECA experience an adhesive failure since the hybrid ECA is retained only on one side.

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