A microplasma printer is employed to deposit thin film patterns of TiO 2 by titanium tetra-isopropoxide and N 2/O 2 plasma at atmospheric pressure. The setup is adopted to carry out deposition in two configurations, namely under chemical vapor deposition (CVD) and atomic layer deposition (ALD) modes. The properties of TiO 2, as well as the patterning resolution, are investigated. The amorphous TiO 2 deposited in the CVD mode contains a relatively high level of impurities (residual carbon content of 5–10 at.%) and is characterized by a low refractive index of 1.8. With the ALD mode on the other hand, TiO 2 is obtained with a low level of impurities (<1 at.% C and <2 at.% N), a refractive index of 1.98, and a growth per cycle of 0.15 nm. Furthermore, the spatial resolution for a 8-nm-thick film is determined by X-ray photoelectron spectroscopy line scan and found to be equal to 2,000 and 900 µm for the CVD and ALD modes, respectively. This study can be regarded as the first step toward area-selective CVD and ALD of TiO 2 by a microplasma printer, which can be further explored and extended to other material systems.
- plasma printing
- plasma-assisted atomic layer deposition
- titanium dioxide