5 research outputs found
Manipulated Transformation of Filamentary and Homogeneous Resistive Switching on ZnO Thin Film Memristor with Controllable Multistate
A bias polarity-manipulated transformation
from filamentary to homogeneous resistive switching was demonstrated
on a Pt/ZnO thin film/Pt device. Two types of switching behaviors,
exhibiting different resistive switching characteristics and memory
performances were investigated in detail. The detailed transformation
mechanisms are systematically proposed. By controlling different compliance
currents and RESET-stop voltages, controllable multistate resistances
in low resistance states and a high resistance states in the ZnO
thin film metal–insulator–metal structure under the
homogeneous resistive switching were demonstrated. We believe that
findings would open up opportunities to explore the resistive switching
mechanisms and performance memristor with multistate storage
Single-Step Formation of ZnO/ZnWO<sub><i>x</i></sub> Bilayer Structure via Interfacial Engineering for High Performance and Low Energy Consumption Resistive Memory with Controllable High Resistance States
A spontaneously
formed ZnO/ZnWO<sub><i>x</i></sub> bilayer resistive memory
via an interfacial engineering by one-step sputtering process with
controllable high resistance states was demonstrated. The detailed
formation mechanism and microstructure of the ZnWO<sub><i>x</i></sub> layer was explored by X-ray photoemission spectroscopy (XPS)
and transmission electron microscope in detail. The reduced trapping
depths from 0.46 to 0.29 eV were found after formation of ZnWO<sub><i>x</i></sub> layer, resulting in an asymmetric <i>I</i>–<i>V</i> behavior. In particular, the
reduction of compliance current significantly reduces the switching
current to reach the stable operation of device, enabling less energy
consumption. Furthermore, we demonstrated an excellent performance
of the complementary resistive switching (CRS) based on the ZnO/ZnWO<sub><i>x</i></sub> bilayer structure with DC endurance >200
cycles for a possible application in three-dimensional multilayer
stacking
ZnO<sub>1–<i>x</i></sub> Nanorod Arrays/ZnO Thin Film Bilayer Structure: From Homojunction Diode and High-Performance Memristor to Complementary 1D1R Application
We present a ZnO<sub>1–<i>x</i></sub> nanorod array (NR)/ZnO thin film (TF) bilayer structure synthesized at a low temperature, exhibiting a uniquely rectifying characteristic as a homojunction diode and a resistive switching behavior as memory at different biases. The homojunction diode is due to asymmetric Schottky barriers at interfaces of the Pt/ZnO NRs and the ZnO TF/Pt, respectively. The ZnO<sub>1–<i>x</i></sub> NRs/ZnO TF bilayer structure also shows an excellent resistive switching behavior, including a reduced operation power and enhanced performances resulting from supplements of confined oxygen vacancies by the ZnO<sub>1–<i>x</i></sub> NRs for rupture and recovery of conducting filaments inside the ZnO TF layer. A hydrophobic behavior with a contact angle of ∼125° can be found on the ZnO<sub>1–<i>x</i></sub> NRs/ZnO TF bilayer structure, demonstrating a self-cleaning effect. Finally, a successful demonstration of complementary 1D1R configurations can be achieved by simply connecting two identical devices back to back in series, realizing the possibility of a low-temperature all-ZnO-based memory system
Tunable Multilevel Storage of Complementary Resistive Switching on Single-Step Formation of ZnO/ZnWO<sub><i>x</i></sub> Bilayer Structure via Interfacial Engineering
Tunable multilevel storage of complementary
resistive switching (CRS) on single-step formation of ZnO/ZnWO<sub><i>x</i></sub> bilayer structure via interfacial engineering
was demonstrated for the first time. In addition, the performance
of the ZnO/ZnWO<sub><i>x</i></sub>-based CRS device with
the voltage- and current-sweep modes was demonstrated and investigated
in detail. The resistance switching behaviors of the ZnO/ZnWO<sub><i>x</i></sub> bilayer ReRAM with adjustable RESET-stop
voltages was explained using an electrochemical redox reaction model
whose electron-hopping activation energies of 28, 40, and 133 meV
can be obtained from Arrhenius equation at RESET-stop voltages of
1.0, 1.3, and 1.5 V, respectively. In the case of the voltage-sweep
operation on the ZnO-based CRS device, the maximum array numbers (<i>N</i>) of 9, 15, and 31 at RESET-stop voltages of 1.4, 1.5,
and 1.6 V were estimated, while the maximum array numbers increase
into 47, 63, and 105 at RESET-stop voltages of 2.0, 2.2, and 2.4 V,
operated by the current-sweep mode, respectively. In addition, the
endurance tests show a very stable multilevel operation at each RESET-stop
voltage under the current-sweep mode
Single CuO<sub><i>x</i></sub> Nanowire Memristor: Forming-Free Resistive Switching Behavior
CuO<sub><i>x</i></sub> nanowires
were synthesized by a low-cost and large-scale electrochemical process
with AAO membranes at room temperature and its resistive switching
has been demonstrated. The switching characteristic exhibits forming-free
and low electric-field switching operation due to coexistence of significant
amount of defects and Cu nanocrystals in the partially oxidized nanowires.
The detailed resistive switching characteristics of CuO<sub><i>x</i></sub> nanowire systems have been investigated and possible
switching mechanisms are systematically proposed based on the microstructural
and chemical analysis via transmission electron microscopy