Analytical transmission electron microscopy observation of aluminiumtungsten interaction in thermally stressed Al/Ti/W/TiN interconnections
In this communication, we used a modern analytical TEMSTEM fully equipped to carry out a complete physical and chemical study of Al/Ti/W/TiN interconnection evolution after 450C annealing. Using energy filtered TEM, compositional mapping, scanning TEM (STEM) Z contrast imaging, EDX and EELS spectrum imaging and micro-diffraction, we evidence at the Al/W top contacts interface a reaction between Al and W leading to the growth of AlxW inclusions inside the Al grains.
energy filtered tem aluminium tungsten interconnection eels spectroscopy edx spectroscopy