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Improvement of Uniformity of Resistive Switching Parameters by Selecting the Electroformation Polarity in IrOx/TaOx/WOx/W Structure
Amit Prakash1,
Siddheswar Maikap1,
Chao Sung Lai1,
Heng Yuan Lee2,
W. S. Chen2,
Frederick T. Chen2,
Ming Jer Kao2, and
Ming Jinn Tsai2
1Thin Film Nano Tech. Lab., Department of Electronic Engineering, Chang Gung University, Kweishan, Taoyuan 333, Taiwan
2Electronic and Opto-Electronic Research Laboratories (EOL), Industrial Technology Research Institute (ITRI), Hsinchu 310, Taiwan
(Received September 26, 2011; accepted February 1, 2012; published online April 20, 2012)
A route to improve the uniformity of key resistive switching memory parameters such as SET/RESET voltages, low/high-resistance states as well as switching cycles is demonstrated in an IrOx/TaOx/WOx/W simple resistive memory stack by selecting the electroformation polarity. The various stack layers are confirmed by high-resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy analyses. Cumulative probability plots of the key memory parameters show tight distribution. The oxygen vacancy filaments are formed/ruptured owing to polarity-dependent oxygen ion migration, which is the switching mechanism in the TaOx/WOx bilayers, and improved resistive switching parameters under positive formation polarity are observed. The fabricated device has shown good potential for multilevel capability with a low voltage operation of ±3 V. The device has shown an excellent read endurance of >105 cycles and data retention up to 10 years at 85 °C.
URL:
http://jjap.jsap.jp/link?JJAP/51/04DD06/
DOI: 10.1143/JJAP.51.04DD06
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