Constitutional supercooling in heavily As-doped Czochralski Si crystal growth

Negative Photoconductance in Heavily Doped Si Nanowire Field-Effect Transistors.

We report the first observation of negative photoconductance (NPC) in n- and p-doped Si nanowire field-effect transistors (FETs) and demonstrate the strong influence of doping concentrations on the nonconventional optical switching of the devices. Furthermore, we show that the NPC of Si nanowire FETs is dependent on the wavelength of visible light due to the phonon-assisted excitation to multip...

Crystal Temperature Control in the Czochralski Crystal Growth Process

This work proposes a control configuration and a nonlinear multivariable model-based feedback controller for the reduction of thermal gradients inside the crystal in the Czochralski crystal growth process after the crystal radius has reached its final value. Initially, a mathematical model which describes the evolution of the temperature inside the crystal in the radial and axial directions and...

Numerical Modeling of Czochralski Silicon Crystal Growth

Modeling of heat transfer is presented for the entire Czochralski Si-growth furnace. The axisymmetric steady-state approach with moving computational grids is used. Melt turbulent flow, inert gas flow, heat transfer in solid parts, and radiative heat transfer in the system are considered. The Reynolds-averaged Navier-Stokes equations written with the Boussinesq approximation and the energy equa...

Selective-Area Growth of Heavily n–Doped GaAs Nanostubs on Si(001) by Molecular Beam Epitaxy

The role of vacancy on trapping interstitial O in heavily As-doped Si

We have investigated the interstitial oxygen Oi diffusion in heavily arsenic As -doped Si using first-principles calculations. We show that it is not the As per se but the Si vacancy V that trap Oi to reduce its diffusion. Arsenic actually plays the role of an arbitrator to activate thermal generation of As–V pairs, which in turn trap Oi with a large binding energy of 1.0 eV, in quantitative ag...