Reflow processes in micro-bumps studied by synchrotron X-ray projection nanotomography
X-ray projection nanotomography was performed for the first time on micro-bumps of different sizes (25?m and 80?m). Based on intermetallic (IMC) volume quantification, this method gives good accuracy in average IMC thickness evaluation. Comparisons of growth kinetics of reaction product between samples undergoing different heat treatments were made. The analysis of the IMC volume and morphology for bumps of different sizes revealed the same growth kinetic behavior.
micro-bumps nanotomography intermetallics snagcu solder interfacial reaction