-A A +A
The hexagonal phase of La2O3 is obtained upon vacuum annealing of hydroxilated La2O3 films grown with atomic layer deposition at 200 °C using La(PirCp)3 and O3. A dielectric constant value of 24±2 and 22±1 is obtained on Si-based and Ge-based metal-oxide-semiconductor capacitors, respectively. However, the relatively good La2O3 dielectric properties are associated with significant interface reactivity on both semiconductor substrates. This leads to the identification of a minimum critical thickness that limits the scaling down of the equivalent oxide thickness of the stack. These findings are explained by the spontaneous formation of lanthanum silicate and germanate species which takes place during the growth and also upon annealing. Although the ultimate film thickness scalability remains an unsolved concern, the use of an O3-based process is demonstrated to be a suitable solution to fabricate La2O3 …
American Institute of Physics
Publication date: 
15 Oct 2010

L Lamagna, C Wiemer, M Perego, SN Volkos, S Baldovino, D Tsoutsou, Sylvie Schamm-Chardon, Pierre-Eugène Coulon, M Fanciulli

Biblio References: 
Volume: 108 Issue: 8 Pages: 084108
Journal of Applied Physics