2, Universität des Saarlandes, Saarbruecken, , Germany
Transparent conducting oxides (TCOs) play an important role in many applications such as displays, touchscreens, solar cells and LEDs. Nowadays, for high-end optical requirements, the most commonly used TCO is indium tin oxide (ITO). With the increasing demand in such optoelectronic applications and uncertainties in indium prices, research is being conducted in order to find alternative oxides that present similar electrical and optical properties as ITO. One of these proposed alternatives is Nb doped TiO2. While sputtered layers of Nb doped TiO2 so far exhibit sufficient transparency and conductivity for TCO applications, wet chemical routes often produce inferior conductivity. In this study, Nb doped anatase TiO2 nanoparticles with different Nb concentrations were synthesized by a sol-gel route and characterized by XRD, TEM and Raman spectroscopy. Pellets were pressed from the powders and used as target for pulsed laser deposition (PLD) on borofloat substrates. The resistivity of the pellets and of the coatings was measured. Coatings were evaluated regarding their optical transmission and haze. Future works will include wet chemical coatings made of nanoparticle inks on different substrates like glass and polymer foils.