Xilian Sun

Anomalous bias-stress-induced unstable phenomena of InZnO thin-film transistors using Ta2O5 gate dielectric

InZnO thin-film transistors using high-κ Ta2O5 gate dielectric are presented and analysed. The large capacitance coupling effect of amorphous Ta2O5 results in fabricated devices with good electrical properties. However, an anomalous negative threshold voltage (Vth) shift under positive bias stress is observed. It is suggested that electron detrapping from the high-κ Ta2O5 dielectric to the gate electrode is responsible for this Vth shift, which is supported both by the logarithmical dependence of the Vth change on the duration of the bias stress and device simulation extracted trapped charges involved.

Investigation on the structural origin of n-type conductivity in InN films

This work presents a study of the correlation between the electrical properties and the structural defects in nominally undoped InN films. It is found that the density of edge-type threading dislocations (TDs) considerably affects the electron concentration and mobility in InN films. The Hall-effect measured electron concentration increases, while the Hall mobility decreases with the increase in the edge-type TD density. With the combination of secondary ion mass spectrometry and positron annihilation analysis, we suggest that donor-type point defects at the edge-type TD lines may serve as dominant donors in InN films and affect the carrier mobility.

Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors

A detailed resonant inelastic X-ray scattering (RIXS) study of a series of well-known cuprate superconductors reveals a correlation between the number of apical oxygens in these systems, and the strength of their in-plane exchange interaction.

Direct observation of charge order in underdoped and optimally doped Bi2(Sr, La)2CuO6+δ by resonant inelastic x-ray scattering

Charge order in underdoped and optimally doped high-

Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-Ray Scattering

T_\mathrm{c}

Structural and electrical characteristics of RF sputtered YON gate dielectrics and their thin-film transistor applications

superconductors Bi

Effects of the precursor ingot for Nd2Fe14B/α-Fe nanocomposite magnets prepared by mechanical milling

_{2}

Effect of substitution of Gd for Nd on the magnetic properties of Nd2Fe14B-α-Fe nanocomposite magnets

Sr

Exchange coupling and magnetic properties of Sm–Co/Fe65Co35 multi-layered films

_{2-x}

Influence of annealing temperature on microstructure and optical properties of sol–gel derived tungsten oxide films

La