LOW-FREQUENCY NOISE TO CHARACTERIZE RESISTIVE SWITCHING OF METAL OXIDE ON POLYMER MEMORIES

Author:

VANDAMME L. K. J.1,CÖLLE M.2,DE LEEUW D. M.3,VERBAKEL F.4

Affiliation:

1. Eindhoven University of Technology, PT 9. 13, 5600 MB Eindhoven, Netherlands

2. Evonik Taiwan Ltd8F, 133 Min Sheng E Rd Sec. 3, Taipei, 10596, Taiwan

3. Philips Research, High Tech Campus 4 (WAG1-234), 5656 AE Eindhoven, Netherlands

4. Philips Applied Technologies, High Tech Campus 7 (3.A.030) 5656 AE Eindhoven, Netherlands

Abstract

Resistive switching in aluminum-polymer diodes has been investigated by noise measurements. Quantitative criteria to characterize the diode states are: (i) Pristine state shows I ∝ Vm with m ≈ 6 at higher bias typical for tunneling. The resistance is very high, 1/f noise is very low, but the relative 1/f noise, fSI/I2 ≡ C1/f is very high. (ii) Forming state is a time-dependent soft breakdown in the Al-oxide that results in random telegraph signal noise (RTS) with a Lorentzian spectrum or in multi-level resistive switching (MLS) with a 1/f3/2 or 1/f-like spectrum. (iii) The H- or L-state shows I ∝ Vm with m = 1 for V < 1 V and 3/2 < m < 2 for V > 1 V . Deviations from ohmic behavior are explained by space charge limited current in the polymer. Reliable H- and L-states show pure 1/f noise, a resistance R that changes by at least a factor 30 and 1/f noise that follows the proportionality: C1/f ∝ R with a proportionality factor αμ( cm 2/ Vs ) of the same level as observed in metals, polymers and other semiconductors. C1/f ∝ R is explained by switching of the number of homogeneous conducting paths in parallel. Deviations in C 1/f ∝ R are also explained. In the pristine state and even in the H-state, only a fraction of the device are is carrying current and switching seems to be at spots of the Al/Al2O3 /polymer interface.

Publisher

World Scientific Pub Co Pte Lt

Subject

General Physics and Astronomy,General Mathematics

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