High device yield of resistive switching characteristics in oxygen-annealed SrZrO3 memory devices

Meng Han Lin*, Ming Chi Wu, Yi Han Huang, Chen Hsi Lin, Tseung-Yuen Tseng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

This paper reports the effects of rapid thermal annealing (RTA) on resistive switching (RS) characteristics and mechanisms of SrZrO3 (SZO)-based memory devices. SZO thin films were deposited on LaNiO3 (LNO) (100)/Pt/Ti/SiO2/Si using radio-frequency magnetron sputtering and were followed by an RTA process in N2, Ar, and O2 ambients, respectively, at various temperatures for improving RS performance. Experimental results indicate that an SZO device annealed in O2 at 600 °C (O2-600) exhibits stable RS properties and has a high device yield (∼ 90%), a reliable retention characteristic (up to 1 × 106s at 100 °C), and steady nondestructive readout properties (over 1.4 × 104s at 100 °C). However, by increasing RTA temperature to more than 700 °C, random formation of LNO (110) precipitates on the bottom surface of SZO grains might shorten the effective thickness of the SZO thin films. Furthermore, a strong electric field possibly occurs at the region between Al top electrodes and low-resistivity LNO precipitates. It is speculated that an RS phenomenon, which occurs within SZO grains instead of on grain boundaries, easily leads to RS failure, further resulting in severe degradation of device yield in the O2-700 and O2-800 devices. When compared with other devices, O2-600 SZO memory devices exhibit highly reliable RS characteristics.

Original languageEnglish
Article number5704573
Pages (from-to)1182-1188
Number of pages7
JournalIEEE Transactions on Electron Devices
Volume58
Issue number4
DOIs
StatePublished - 1 Apr 2011

Keywords

  • Oxygen vacancy
  • rapid thermal annealing (RTA)
  • resistive random access memory (RRAM)
  • SrZrO (SZO)

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