In this paper, two types of multi-walled carbon nanotube (MWCNT)-filled solderable electrically conductive adhesive (SECA) systems were formulated, a solderable isotropic conductive adhesive (SICA) containing 40 vol% of low melting point alloy (LMPA), and a solderable anisotropic conductive adhesive (SACA) with 20 vol% of LMPA, with different MWCNT contents (0, 0.03, 0.5 and 2 wt%). A quad flat package (QFP) interconnection test was conducted for each SECA system to investigate the influence of the MWCNT concentration on the interconnection properties of the SICA and SACA systems. The results indicated that the interconnection properties (i.e., electrical and mechanical properties) of each SECA were enhanced at low MWCNT concentration, due to the reinforcing effects of the MWCNT. However, the interconnection properties of each SECA joint deteriorated with increasing MWCNT concentration over 0.5 wt% because of defects in the conduction path, such as entrapped MWCNT-filled polymer (SICA), or reduction of the conduction path area (SACA) due to increased polymer viscosity and diminished molten LMPA mobility.

In this paper, two types of assemblies using CNT-filled SACAs (with 0.03 wt% CNTs and without CNT) were prepared to investigate the influence of carbon nanotubes (CNTs) on the reliability properties of solderable anisotropic conductive adhesives (SACAs) with a low-melting-point alloy (LMPA). Two types of reliability test including thermal shock (TS:-55 to 125 ℃, 1000 cycles) and high-temperature and high-humidity (HTHH: 85 ℃, 85% RH, 1000 h) tests were conducted. The SACA assemblies with and without CNTs showed stable electrical reliability properties due to the formation of wide and stable metallurgical interconnection between corresponding metallizations by the molten LMPA fillers. Although the mechanical pull strength of CNT-filled SACA assemblies was decreased after thermal aging (because of the excessive layer growth and planarization of the IMCs), the CNT-filled SACA with 0.03wt% CNTs showed enhanced mechanical reliability properties compared with the SACA assemblies no CNTs. This enhancement in mechanical performance was due to the reinforcement effect of the CNTs. These results demonstrate that CNTs within the CNTfilled SACAs can improve the reliability properties of CNT-filled SACAs joints due to their superior physical properties.