Measurement of linewidth and line edge roughness for 1D nano CD linewidth standard product lines

One-dimensional nano CD (NCD) linewidth standard product lines are prepared using multilayer thin films deposition technique. The Ti/SiO2 multilayer thin films are systematically deposited on silicon substrates in the conventional electron-beam evaporation system. Then a single nanometer scale line can be obtained on the cleaved cross-section of one multilayer thin films structure. The linewidth and line edge roughness (LER) have been evaluated by analyzing top-down scanning electron microscope (SEM) images off-line using image processing techniques. The average linewidth is less than 25 nm and LER is estimated.