Oxide–semiconductor interface quality of high-pressure reactive sputtered (HPRS) TiO2 films annealed in O2 at temperatures ranging from 600 to 900 °C, and atomic layer deposited (ALD) grown 225 or 275 °C TiCl4 Ti(OC2H5)4, 750 O2, has been studied on silicon substrates. Our attention focused the interfacial state disordered-induced gap densities. From our results, HPRS oxygen atmosphere exhibit best characteristics, with Dit density being lowest value measured this work (5–6 × 1011 cm−2...

In this work, the electrical characteristics of different atomic layer deposited high-permittivity dielectric films (Al2O3, HfO2, and a nanolaminate them), with physical thickness about 10 nm, are evaluated. An extensive capacitance-voltage current-voltage characterization at room temperature is carried out on metal-insulator-semiconductor structures fabricated p-type n-type silicon substrates Al as metal gate. HfO2 layers found to exhibit higher constant, but they suffer from largest...

A crucial step in order to achieve fast and low-energy switching operations resistive random access memory (RRAM) memories is the reduction of programming pulse width. In this study, incremental with verify algorithm (ISPVA) was implemented by using different widths between 10 μ s 50 ns assessed on Al-doped HfO 2 4 kbit RRAM arrays. The stability means an endurance test 1k cycles. Both conductive levels voltages needed for showed a remarkable good behavior along reset/set cycles regardless...

Abstract Memristive devices have shown a great potential for non-volatile memory circuits and neuromorphic computing. For both applications it is essential to know the physical mechanisms behind resistive switching; in particular, time response external voltage signals. To shed light these issues we studied role played by applied ramp rate electrical properties of TiN/Ti/HfO 2 /W metal–insulator–metal switching devices. Using an ad hoc experimental set-up, current–voltage characteristics...

An electrical characterization of Al2O3 based metal-insulator-semiconductor structures has been carried out by using capacitance-voltage, deep level transient spectroscopy, and conductance-transient (G-t) techniques. Dielectric films were atomic layer deposited (ALD) at temperatures ranging from 300 to 800 °C directly on silicon substrates an buffer that was grown in the same process 15 ALD cycles °C. As for single growth temperatures, leads lowest density states distributed away interface...

Intermediate band formation on silicon layers for solar cell applications was achieved by titanium implantation and laser annealing. A two-layer heterogeneous system, formed the implanted layer un-implanted substrate, formed. In this work, we present first time electrical characterization results which show that recombination is suppressed when Ti concentration high enough to overcome Mott limit, in agreement with intermediate theory. Clear differences have been observed between samples...

Amorphous or cubic thin films were grown from tris(2,3-dimethyl-2-butoxy)gadolinium(III), , and precursors at . As-deposited on etched (H-terminated) Si(100) exhibited better leakage current-voltage characteristics as well lower flatband voltage shift than substrates. Interface trap densities in /hydrofluoric acid (HF)-etched Si samples annealed rather high temperatures.

Due to the high number of reachable conductance levels in resistive switching devices, they are good candidates implement artificial synaptic devices. In this work, we have studied control intermediate HfO2-based MIM capacitors using current pulses. The set transition can be controlled a linear way kind signal. potentiation characteristic is not affected by pulse length due filament formation takes place very short times. This behavior does allow identical pulses obtain characteristic....

The dependence of the current in TiN/Ti/HfO2/W devices on temperature is investigated range from 78 K to 340 K. Resistive switching cycles at are conducted explore thermal filament configurations with different intermediate resistance states. less conductive states show an increase as rises, while fully formed displays a metallic-like behavior. A comprehensive model, based Stanford Model including series resistance, proposed and successfully validated by experimental data. interplay between...

The electrical properties of HfO2-based metal–insulator–semiconductor capacitors have been systematically investigated by means I–V and C–V characteristics, admittance spectroscopy, deep level transient conductance transient, flat band voltage techniques. Attention is also given to the study temperature dependence leakage current. HfO2 films were grown on p-type silicon substrates atomic layer deposition using hafnium tetrakis(dimethylamide) as precursor, ozone or water oxygen precursors....

A thorough study of the admittance TiN/Ti/HfO2/W bipolar resistive memories [resistance random access memory (RRAM)] was carried out under different bias conditions and in a wide range ac signal frequencies. We demonstrate that continuum intermediate states can be obtained by applying appropriate dc waveforms. Cumulative writing erasing cycles were performed triangular voltage waveform increasing amplitude. The influence initial on variation real (conductance) imaginary (susceptance)...

An in-depth simulation and experimental study has been performed to analyze thermal effects on the variability of resistive memories. Kinetic Monte Carlo (kMC) simulations, that reproduce well nonlinearity stochasticity switching devices, have employed explain results. The series resistance transition voltages currents extracted from devices based TiN/Ti/HfO2/W stack we fabricated measured at temperatures ranging 77 K 350 K. We observed for all magnitudes analyzed was much higher low...

Al / HfO 2 SiN x : H n -Si metal-insulator-semiconductor capacitors have been studied by electrical characterization. Films of silicon nitride were directly grown on n-type substrates electron cyclotron resonance assisted chemical vapor deposition. Silicon thickness was varied from 3 to 6.6 nm. Afterwards, 12 nm thick hafnium oxide films deposited the high-pressure sputtering approach. Interface quality determined using current-voltage, capacitance-voltage, deep-level transient spectroscopy...

The influence of the silicon nitride blocking layer thickness on interface state densities (Dit) HfO2/SiNx:H gate-stacks n-type have been analyzed. consisted 3 to 7 nm thick films directly grown substrates by electron-cyclotron-resonance assisted chemical-vapor-deposition. Afterwards, 12 hafnium oxide were deposited high-pressure reactive sputtering. Interface determined deep-level transient spectroscopy (DLTS) and high low frequency capacitance-voltage (HLCV) method. HLCV measurements...

In the attempt to understand behavior of HfO2-based resistive switching devices at low temperatures, TiN/Ti/HfO2/W metal–insulator–metal were fabricated; atomic layer deposition technique was used grow high-k layer. After performing an electroforming process room temperature, device cooled in a cryostat carry out 100 current–voltage cycles several temperatures ranging from “liquid nitrogen temperature” 350 K. The measurements showed semiconducting high and resistance states. state, hopping...

HfO2 thin films were atomic-layer deposited using different-precursor partial pressures and at different growth temperatures on n- p-type silicon substrates. The effect of processing parameters film thickness the electrical quality oxide–semiconductor interface was studied. Deep-level-transient spectroscopy conductance-transient techniques revealed 3–10 × 1011 cm−2 eV−1 trap densities, somewhat dependent conditions. Charge trapping took place mainly between semiconductor defects located...

Thin solid films consisting of ZrO2 and Fe2O3 were grown by atomic layer deposition (ALD) at 400 °C. Metastable phases stabilized doping. The number alternating cycles varied in order to achieve with different cation ratios. influence annealing on the composition structure thin was investigated. Additionally, electrical magnetic properties studied. Several samples exhibited a measurable saturation magnetization most charge polarization. Both phenomena observed sample Zr/Fe ratio 2.0.

In the attempt to form an intermediate band in bandgap of silicon substrates give it capability absorb infrared radiation, we studied deep levels supersaturated with titanium. The technique used characterize energy was thermal admittance spectroscopy. Our experimental results showed that samples titanium concentration just under Mott limit there a relationship among activation value and capture cross section value. This obeys well known Meyer-Neldel rule, which typically appears processes...

Resistive switching conduction in Ni/HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /Si capacitors is studied at temperatures ranging from 77 to 473 K. A model for the low-resistance state (LRS) consistent with experimental data proposed. The LRS current-voltage (I-V) curves show a maximum resistance, R xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> , zero bias and minimum value,...

Ionizing radiation effects on the electrical properties of HfO2, Gd2O3, and HfO2∕SiO2 based metal-oxide-semiconductor (MOS) capacitors have been studied. High-k dielectrics grown by atomic layer deposition high-pressure Sputtering were exposed to photon (18MeV photons). Capacitance-voltage curves, deep-level transient spectroscopy, conductance flat-band voltage transients, current-voltage techniques used characterize samples. An increment in bulk dielectric trap densities has observed when...