7 nm FinFET (Fin field-effect transistor) process technology was introduced to semiconductor manufacturing mass production in 2018, following 10 nm node in 2016, 14 nm node in 2014 and 22 nm node in 2012[1]. While the naming of process nodes is not directly related to any measurable distance on a chip, 7 nm process technology provides shrink down transistors and thus offers improvement in silicon area utilization and power efficiency. In this application note, we provide a materials analysis study into the comparison between 22 nm node and 7 nm node FinFET technologies, using TEM-based (Transmission Electron Microscopy) techniques.