Abstract
Nanofiber-sheet anisotropic conductive films (NS-ACFs) were invented to overcome the limitations of high joint resistance and short-circuit issues of ultra-fine-pitch interconnections. The NS-ACFs have great advantages in terms of suppressing conductive particle movement during the flip-chip bonding process. In a 20-μm ultra-fine-pitch with 7-μm bump spacing ultra-fine-pitch chip-on-glass assembly, suppression effects of conductive particle movement were significantly improved by using the NS-ACFs because an unmelted NS inside the ACFs suppressed the mobility of conductive particles so that they would not flow out during the bonding process. The NS-ACFs could significantly increase the capture rate of conductive particles from 31% up to 81% compared to conventional ACFs. Moreover, excellent electrical contact properties were obtained without melting the nanofiber material which was essential for the conventional nanofiber ACFs. The NS-ACFs are promising interconnection materials for ultra-fine-pitch packaging applications.
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References
J.U. Knickerbocker, P.S. Andry, L.P. Buchwalter, and A. Deutsch, IBM J. Res. Dev. 49, 725 (2005).
M.J. Yim, C.K. Chung, and K.W. Paik, IEEE Trans. Electron. Packag. 30, 306 (2007).
C.K. Chung, G.D. Sim, S.B. Lee, and K.W. Paik, IEEE Trans. Compon. Packag. Manuf. Technol. 2, 359 (2012).
K. Takahashi, M. Umemoto, N. Tanaka, K. Tanida, Y. Nemoto, Y. Tomita, M. Tago, and M. Bonkohara, Microelectron. Reliab. 43, 1267 (2003).
M.J. Yim and K.W. Paik, Int. J. Adhes. Adhes. 26, 304 (2006).
M.J. Yim, C.K. Chung, and K.W. Paik, IEEE Trans. Electron. Packag. 30, 306 (2007).
C.K. Chung, G.D. Sim, S.B. Lee, and K.W. Paik, IEEE Trans. Compon. Packag. Manuf. Technol. 2, 359 (2012).
G. Taylor, Math. and Phys. Sci. 313, 453 (1969).
W.S. Kwon and K.W. Paik, IEEE Trans. Compon. Packag. Technol. 29, 528 (2006).
C.T. Peng, C.M. Liu, J.C. Lin, H.C. Cheng, and K.N. Chiang, IEEE Trans. Compon. Packag. Technol. 27, 684 (2004).
Y.W. Chiu, Y.C. Chan, and S.M. Lui, Microelectron. Reliab. 2002, 42 (1945).
C. Jang, S. Han, J. Ryu, S. Cho, and H. Kim, IEEE Trans. Adv. Packag. 30, 2 (2007).
S.H. Lee, K.L. Suk, K. Lee, and K.Y. Paik, IEEE Trans. Compon. Packag. Manuf. Technol. 2, 2108 (2012).
K.L. Suk, C.K. Chung, and K.W. Paik, J. Nanosci. Nanotechnol. 13, 351 (2013).
S.H. Lee, T.W. Kim, K.L. Suk, and K.W. Paik, J. Electron. Mater. 44, 4628 (2015).
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Lee, SH., Paik, KW. A Study on the Nanofiber-Sheet Anisotropic Conductive Films (NS-ACFs) for Ultra-Fine-Pitch Interconnection Applications. J. Electron. Mater. 46, 167–174 (2017). https://doi.org/10.1007/s11664-016-4895-5
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DOI: https://doi.org/10.1007/s11664-016-4895-5