The effect of aluminum doping on crystallinity, non-lattice oxygen, and resistance switching of Al-doped HfO2 films deposited by reactive sputtering

Kyumin Lee, Heedo Na, Hyunchul Sohn, Jonggi Kim

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1 Citation (Scopus)

Abstract

In this work, the resistance switching characteristics of Al-doped HfO2 thin films were investigated with by systematically varying the Al concentration and analyzing of the microstructure and the chemical bonding states. TiN/Al-doped HfO2/Pt metal-insulator-metal stacks were fabricated with various Al concentrations of up to 16.8% by using reactive DC magnetron co-sputtering. X-ray diffraction and transmission electron microscopy measurement showed that HfO2 doped with more than 10.4% Al had an amorphous structure, while HfO2 doped with Al of less than 5.6% had a crystalline structure. X-ray photoelectron spectroscopy (XPS) showed that the concentration of non-lattice oxygen in Aldoped HfO2 films increased with increasing Al up to 5.6% and was saturated for Al concentrations above 5.6%. TiN/Al-doped HfO2/Pt stacks showed typical bipolar resistance switching characteristics. HfO2 doped with Al = 5.6% showed the smallest grains and the smallest uniformity in the forming electric field and the SET/RESET resistance distribution. We conclude that the grain boundaries play a more important role than point defects such as non-lattice oxygen in the resistance switching.

Original languageEnglish
Pages (from-to)709-716
Number of pages8
JournalJournal of the Korean Physical Society
Volume65
Issue number5
DOIs
Publication statusPublished - 2014 Sep 1

Bibliographical note

Funding Information:
This work was supported by the industry-university cooperation project of Samsung Electronics and by the Brain Korea 21 PLUS (BK21 PLUS).

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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