Formation of HfO2/GaAs(001) interface with Si interlayer
Composition and electrical characteristics of HfO2/Si/GaAs(001) interface formed by e-beam evaporation of Hf in NO2 ambient on MBE-grown Si/GaAs structure, were studied by XPS and C-V methods. The deposition of HfO2 on Si-passivated GaAs(001) surface leads to the formation of sharp HfO2/Si/GaAs interface without oxidation of Si interlayer. AFM studies of the HfO2/Si/GaAs(001) interface show that HfO2 deposition preserved the flatness of the surface, keeping the mean roughness on the terraces on a level of approximately 0.2-0.3 nm. © 2011 IEEE.