TY - JOUR
T1 - Softening of micro Sn electrodeposit by polyethylene glycol (PEG) addition
AU - Chiu, Tsung Chieh
AU - Chiu, Ying Ta
AU - Lin, Kwang Lung
N1 - Funding Information:
The authors thank the Ministry of Science and Technology, Taiwan, for the financial support of the study under grant MOST 104-2221-E-006-028-MY3.
PY - 2018/1
Y1 - 2018/1
N2 - The plastic deformation of solder occurs during the procedure of thermal compression bonding. The lower stress applied by using soft material is thus anticipated. The present study investigated the softening effect of polyethylene glycol (PEG) 6000 on micro Sn electrodeposition. The grain size, thickness, surface roughness (Ra), interfacial reactions and phase evolution of Sn deposit on Cu substrate were investigated to find their effects on mechanical properties. The Sn deposit obtained without PEG addition exhibited the highest hardness and elastic modulus due to the grain refining effect. With 0.15 g/L PEG addition, the significant drops of hardness and elastic modulus of deposition were 80.5% and 87.7% under 4 mA/cm2 while as 66.1% and 67.9% under 5 mA/cm2. The softening Sn deposit was attributed to the grain growth when adding PEG in electroplating bath. With appropriate PEG addition, the high portion of Cu6Sn5 produced in the deposit was responsible for the relative high mechanical properties.
AB - The plastic deformation of solder occurs during the procedure of thermal compression bonding. The lower stress applied by using soft material is thus anticipated. The present study investigated the softening effect of polyethylene glycol (PEG) 6000 on micro Sn electrodeposition. The grain size, thickness, surface roughness (Ra), interfacial reactions and phase evolution of Sn deposit on Cu substrate were investigated to find their effects on mechanical properties. The Sn deposit obtained without PEG addition exhibited the highest hardness and elastic modulus due to the grain refining effect. With 0.15 g/L PEG addition, the significant drops of hardness and elastic modulus of deposition were 80.5% and 87.7% under 4 mA/cm2 while as 66.1% and 67.9% under 5 mA/cm2. The softening Sn deposit was attributed to the grain growth when adding PEG in electroplating bath. With appropriate PEG addition, the high portion of Cu6Sn5 produced in the deposit was responsible for the relative high mechanical properties.
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U2 - 10.1149/2.0121803jss
DO - 10.1149/2.0121803jss
M3 - Article
AN - SCOPUS:85083445599
SN - 2162-8769
VL - 7
SP - P109-P113
JO - ECS Journal of Solid State Science and Technology
JF - ECS Journal of Solid State Science and Technology
IS - 3
ER -