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Initial interfacial reaction layers formed in Sn–3.5Ag solder/electroless Ni–P plated Cu substrate system

Published online by Cambridge University Press:  31 January 2011

Han-Byul Kang ,
Jae-Wook Lee ,
Jee-Hwan Bae ,
Min-Ho Park ,
Jeong-Won Yoon ,
Seung-Boo Jung ,
Jae-Seon Ju  and
Cheol-Woong Yang
Han-Byul Kang
Affiliation:
School of Advanced Materials Science & Engineering and Center for Nanotubes & Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, South Korea
Jae-Wook Lee
Affiliation:
School of Advanced Materials Science & Engineering and Center for Nanotubes & Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, South Korea
Jee-Hwan Bae
Affiliation:
School of Advanced Materials Science & Engineering and Center for Nanotubes & Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, South Korea
Min-Ho Park
Affiliation:
School of Advanced Materials Science & Engineering and Center for Nanotubes & Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, South Korea
Jeong-Won Yoon
Affiliation:
School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746, South Korea
Seung-Boo Jung
Affiliation:
School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746, South Korea
Jae-Seon Ju
Affiliation:
Cooperative Center for Research Facilities, Sungkyunkwan University, Suwon 440-746, South Korea
Cheol-Woong Yang*
Affiliation:
School of Advanced Materials Science & Engineering and Center for Nanotubes & Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, South Korea
*
a)Address all correspondence to this author. e-mail: cwyang@skku.edu
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Abstract

Analytical electron microscopy (AEM) was used to examine the initial interfacial reaction layers between a eutectic Sn–3.5Ag solder and an electroless nickel-immersion gold-plated (ENIG) Cu substrate during reflow at 255 °C for 1 s. AEM confirmed that a thick upper (Au,Ni)Sn2 layer and a thin Ni3Sn4 layer had formed through the reaction between the solder and ENIG. The amorphous electroless Ni(P) plated layer transformed into two P-rich Ni layers. One is a crystallized P-rich Ni layer, and the other is an intermediate state P-rich Ni layer before the crystallization. The crystallized P-rich layer consisted of Ni2P and Ni12P5. A thin Ni2P layer had formed underneath the Ni3Sn4 layer and is believed to be a predecessor of the Ni2SnP ternary phase. A Ni12P5 phase was observed beneath the Ni2P thin layer. In addition, nanocrystalline Ni was found to coexist with the amorphous Ni(P) phase in the intermediate state P-rich Ni layer.

Keywords

PackagingSolderingTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2195 - 2201
Copyright
Copyright © Materials Research Society 2008

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References

REFERENCES

1Zeng, K.Tu, K.N.: Six cases of reliability study of Pb-free solder joints in electronic packaging technology. Mater. Sci. Eng., R 38, 55 2002CrossRefGoogle Scholar
2Abtew, M.Selvaduray, G.: Lead-free solders in microelectronics. Mater. Sci. Eng., R 27, 95 2000CrossRefGoogle Scholar
3Suganuma, K.: Advances in lead-free electronics soldering. Curr. Opin. Solid State Mater. Sci. 5, 55 2001CrossRefGoogle Scholar
4Yoon, J.W.Jung, S.B.: Interfacial reactions and shear strength on Cu and electrolytic Au/Ni metallization with Sn–Zn solder. J. Mater. Res. 21, 1590 2006CrossRefGoogle Scholar
5Yoon, J.W., Lim, J.H., Lee, H.J., Joo, J., Moon, W.C.Jung, S.B.: Interfacial reactions and joint strength of Sn–37Pb and Sn–3.5Ag solders with immersion Ag-plated Cu substrate during aging at 150 °C. J. Mater. Res. 21, 3196 2006CrossRefGoogle Scholar
6Islam, M.N., Chan, Y.C.Sharif, A.: Interfacial reactions of Sn–Cu and Sn–Pb–Ag solder with Au/Ni during extended time reflow in ball grid array packages. J. Mater. Res. 19, 2897 2004CrossRefGoogle Scholar
7Wang, C.H.Chen, S.W.: Sn–0.7wt%Cu/Ni interfacial reactions at 250 °C. Acta Mater. 54, 247 2006CrossRefGoogle Scholar
8Kim, S.W., Yoon, J.W.Jung, S.B.: Interfacial reactions and shear strengths between Sn–Ag-based Pb-free solder balls and Au/EN/Cu metallization. J. Electron. Mater. 33, 1182 2004CrossRefGoogle Scholar
9Jang, J.W., Frear, D.R., Lee, T.Y.Tu, K.N.: Morphology of interfacial reaction between lead-free solders and electroless Ni–P under bump metallization. J. Appl. Phys. 88, 6359 2000CrossRefGoogle Scholar
10Wang, S.J.Liu, C.Y.: Retarding growth of Ni3P crystalline layer in Ni(P) substrate by reacting with Cu-bearing Sn(Cu) solders. Scr. Mater. 49, 813 2003CrossRefGoogle Scholar
11Lin, Y.C.Duh, J.G.: Phase transformation of the phosphorus-rich layer in SnAgCu/Ni–P solder joints. Scr. Mater. 54, 1661 2006CrossRefGoogle Scholar
12Lin, Y.C., Shih, T.Y., Tien, S.K.Duh, J.G.: Suppressing Ni–Sn–P growth in SnAgCu/Ni–P solder joints. Scr. Mater. 56, 49 2007CrossRefGoogle Scholar
13Vuorinen, V., Laurila, T., Yu, H.Kivilahti, J.K.: Phase formation between lead-free Sn–Ag–Cu solder and Ni(P)/Au finishes. J. Appl. Phys. 99, 023530 2006CrossRefGoogle Scholar
14Lee, C.B., Jung, S.B., Shin, Y.E.Shur, C.C.: Effect of surface finishes on ball shear strength in BGA joints with Sn–3.5 mass% Ag solder. Mater. Trans. 43, 1858 2002CrossRefGoogle Scholar
15Alam, M.O., Chan, Y.C.Tu, K.N.: Effect of reaction time and P content on mechanical strength of the interface formed between eutectic Sn–Ag solder and Au/electroless Ni(P)/Cu bond pad. J. Appl. Phys. 94, 4108 2003CrossRefGoogle Scholar
16Zeng, K., Vuorinen, V.Kivilahti, J.K.: Interfacial reactions between lead-free SnAgCu solder and Ni(P) surface finish on printed circuit boards. IEEE Trans. Electron. Pack. Manuf. 25, 162 2002CrossRefGoogle Scholar
17Jeon, Y.D., Paik, K.W., Bok, K.S., Choi, W.S.Cho, C.L.: Studies of electroless nickel under bump metallurgy—Solder interfacial reactions and their effects on flip chip solder joint reliability. J. Electron. Mater. 31, 520 2002CrossRefGoogle Scholar
18Kang, H.B., Bae, J.H., Lee, J.W., Park, M.H., Yoon, J.W., Jung, S.B.Yang, C.W.: Characterization of interfacial reaction layers formed between Sn–3.5Ag solder and electroless Ni-immersion Au-plated Cu substrates. J. Electron. Mater. 37, 84 2008CrossRefGoogle Scholar
19Hur, K., Jeong, J.Lee, D.: Microstructures and crystallization of electroless Ni–P deposits. J. Mater. Sci. 25, 2573 1990CrossRefGoogle Scholar
20Ma, E., Luo, S.Li, P.: A transmission-electron-microscopy study on the crystallization of amorphous Ni–P electroless deposited coatings. Thin Solid Film 166, 273 1988Google Scholar
21Gao, J., Wu, Y., Liu, L., Shen, B.Hu, W.: Crystallization temperature of amorphous electroless nickel–phosphorus alloys. Mater. Lett. 59, 1665 2005Google Scholar
22Marshall, G.W., Lewis, D.B.Dodds, B.E.: Electroless deposition of Ni–P alloys with and without the use of superimposed pulsed current. Surf. Coat. Technol. 53, 223 1992CrossRefGoogle Scholar
23Williams, D.B.Carter, C.B.: Transmission Electron Microscopy Plenum Press New York 1996 351–360CrossRefGoogle Scholar
24Szasz, A., Fabian, D.J., Paal, Z.Kojnok, J.: Chemical mechanisms in electroless deposition. J. Non-Cryst. Solids 103, 21 1988CrossRefGoogle Scholar