Type:
Journal
Description:
A dependence of the binding energy of the Hf 4f and O 1s photoemission lines on the thickness of the HfO2 film is identified in HfO2/Si heterojunctions and associated with differential charging phenomena. No shifts of Hf 4f and O 1s binding energies are observed in HfO2/Ge heterojunctions, irrespective of the HfO2 film thickness. The time evolution of Hf 4f and Ge 3d signals correlates with a large number of electrically active traps, which are close to the Ge valence bands and determine a negative charge builds-up at the interface, causing the commonly observed p-type surface inversion in n-Ge.
Publisher:
American Institute of Physics
Publication date:
19 Nov 2012
Biblio References:
Volume: 101 Issue: 21 Pages: 211606
Origin:
Applied Physics Letters