Browsing by Author "Liu, R."

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MULTI-LEVEL OPERATION OF FULLY CMOS COMPATIBLE WOX RESISTIVE RANDOM ACCESS MEMORY (RRAM)
(2009)
Chien, W. C.
;
Chen, Y. C.
;
Chang, K. P.
;
Lai, E. K.
;
Yao, Y. D.
The multi-level operation of WOX based RRAM has been investigated. Improvement of our WOX process has produced an extended linear R-V region for our devices. By adding an electrical forming process and a program-verify algorithm we have demonstrated stable 2-bit/cell operation, with potential for 3-bit/cell. The reliability of the MLC operation has been examined and very stable high temperature retention, robust read disturb immunity and initial cycling endurance of >1,000 times have been demonstrated.
Unipolar Switching Behaviors of RTO WO(X) RRAM
(2010-02-01)
Chien, W. C.
;
Chen, Y. C.
;
Lai, E. K.
;
Yao, Y. D.
;
Lin, P.
The microstructure and electrical properties of the WO(X)-based resistive random access memory are investigated in this letter. The WO(X) layer is formed by converting the surface of the W plug with a CMOS-compatible rapid thermal oxidation process. The conductive-atomic-force-microscopy result indicates that nanoscale conducting channels exist in the WO(X) layer and result in a low initial resistance. This letter studies the unipolar operation-the programming, reading, and reliability behaviors of the device are characterized systematically. The low programming voltages for RESET (3.3 V/50 ns) and fast SET speed (3 V/300 ns) are achieved along with cycling endurance greater than 10(7) times. In addition, the device is immune to read disturb. A 2-bit/cell operation is also demonstrated for high-density applications.
Unipolar Switching Behaviors of RTO WOX RRAM
(2010-02-01)
Chien, W. C.
;
Chen, Y. C.
;
Lai, E. K.
;
Yao, Y. D.
;
Lin, P.
The microstructure and electrical properties of the WOX-based resistive random access memory are investigated in this letter. The WOX layer is formed by converting the surface of the W plug with a CMOS-compatible rapid thermal oxidation process. The conductive-atomic-force-microscopy result indicates that nanoscale conducting channels exist in the WOX layer and result in a low initial resistance. This letter studies the unipolar operation-the programming, reading, and reliability behaviors of the device are characterized systematically. The low programming voltages for RESET (3.3 V/50 ns) and fast SET speed (3 V/300 ns) are achieved along with cycling endurance greater than 10(7) times. In addition, the device is immune to read disturb. A 2-bit/cell operation is also demonstrated for high-density applications.