Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8033190 | Thin Solid Films | 2018 | 25 Pages |
Abstract
The changes of the defect states below the conduction band in atomic-layered HfO2 film grown on SiC substrate were examined as a function of the post-nitridation annealing temperature in an NH3 ambient. As the post-nitridation annealing temperature increased up to 600 °C, the incorporated nitrogen into the HfO2/SiC interface was gradually increased. The band gap and valence band offset were mostly increased as a function of the post-nitridation annealing temperature and the band alignment of HfO2 films changed. O K-edge absorption features revealed two distinct band edge states below the conduction band edge in HfO2 films, and these defect states were dramatically reduced with increasing of the post-nitridation annealing temperature. The reduction of defect states in HfO2/SiC improved the electrical properties such as the leakage current density, breakdown voltage, and trap charge density in the HfO2 film and interface of HfO2/SiC.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Sera Kwon, Dae-Kyoung Kim, Mann-Ho Cho, Kwun-Bum Chung,