Bipolar switching properties of amorphous TiO2 thin film grown on TiN/Si substrate

Beom Seok Lee, Bo Yun Kim, Ji Hyeon Lee, Jong Hee Yoo, Kwon Hong, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Pt/TiO2/TiN device with the amorphous TiO2 film grown at room temperature under an oxygen partial pressure of 1.0 mTorr showed reliable bipolar switching behavior. During the electroforming process, a large number of oxygen vacancies formed in the TiO2 film and accumulated at the Pt/TiO2 interface. The barrier height of the Schottky contact of the Pt/TiO2 interface was reduced owing to the presence of these oxygen vacancies, resulting in the low-resistance state (LRS). Moreover, oxygen ions diffused into the TiN electrode during the electroforming and set processes. On the other hand, the oxygen ions in the TiN electrode diffused out and reacted with oxygen vacancies in the TiO2 film during the reset process, and the device changed from the LRS to the high-resistance state (HRS). Conduction in the LRS and HRS can be attributed to Ohmic conduction and the trap controlled space charged limited mechanism, respectively.

Original languageEnglish
Pages (from-to)1825-1830
Number of pages6
JournalCurrent Applied Physics
Issue number12
Publication statusPublished - 2014 Dec

Bibliographical note

Funding Information:
This work is supported through SKhynix-Korea University Nano-Semiconductor Program and the Industrial Strategic Technology Development Program, 10041232, funded by the Ministry of Knowlodge Economy (MKE, Korea).

Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.


  • Conduction mechanism of LRS is explained by the Ohm's law
  • Forming mechanism is Schottky emission
  • HRS can be explained by SCLC
  • Thin film is shown bipolar resistive switching behavior
  • TiO is deposited on TiN substrate at room temperature

ASJC Scopus subject areas

  • General Materials Science
  • General Physics and Astronomy


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