Controlled oxygen vacancy induced p-type conductivity in HfO{2-x} thin films
arXiv:1111.2785 · doi:10.1063/1.3637603
Abstract
We have synthesized highly oxygen deficient HfO$_{2-x}$ thin films by controlled oxygen engineering using reactive molecular beam epitaxy. Above a threshold value of oxygen vacancies, p-type conductivity sets in with up to 6 times 10^{21} charge carriers per cm3. At the same time, the band-gap is reduced continuously by more than 1 eV. We suggest an oxygen vacancy induced p-type defect band as origin of the observed behavior.
4 pages, 3 figures