We report the first (to our knowledge) observation of correlated photon emission in hydrogenated amorphous-silicon waveguides. We compare this to photon generation in crystalline silicon waveguides with the same geometry. In particular, we show that amorphous silicon has a higher nonlinearity and competes with crystalline silicon in spite of higher loss.

This article presents infrared absorption data of amorphous silicon alloys in which the hydrogen isotopes deuterium and tritium have been substituted for hydrogen. Silicon–deuterium and silicon– tritium vibration frequencies are related to silicon–hydrogen vibration frequencies by simple mass relationships. The silicon–deuterium wagging vibration is broadened and blueshifted due to strong coupl...

In this work we study the electronic surface passivation of crystalline silicon with intrinsic thin silicon films deposited by Catalytic CVD. The contactless method used to determine the effective surface recombination velocity was the Quasi-Steady-State Photoconductance technique. Hydrogenated amorphous and nanocrystalline silicon films were evaluated as passivating layers on nand p-type float...

Structural transformations between disordered phases, such as liquid-liquid and amorphousamorphous transformations (polyamorphic transformations), have been a focus of interest for the past years. In water, amorphous-amorphous transformation was experimentally observed and transformation between two distinct liquid forms has also been examined [1]. Since a typical atomic configuration of silico...

We report the thermal conductivity and specific heat of amorphous silicon thin films measured from 5-300 K using silicon-nitride membrane-based microcalorimeters. Above 50 K the thermal conductivity of thin-film amorphous silicon agrees with values previously reported by other authors. However, our data show no plateau, with a low T suppression of the thermal conductivity that suggests that the...

Nanocrystalline fluorinated silicon films are studied by using Raman spectroscopy, electron paramagnetic resonance, Fourier-transformed infrared spectroscopy, atomic force microscopy, nonlinear laser spectroscopy, and photoluminescence. Electrical properties of nanocrystalline silicon and amorphous silicon films were compared. The field-assisted migration of point defects is dramatic for durabi...

To investigate the hole transport across amorphous/crystalline silicon heterojunctions, solar cells with varying band offsets were fabricated using amorphous silicon suboxide films. The suboxides enable good passivation if covered by a doped amorphous silicon layer. Increasing valence band offsets yield rising hole transport barriers and reduced device effciencies. Carrier transport by thermal ...

The structure of amorphous silicon in its pure and hydrogenated form has attracted wide interest over the last five decades. This substantial interest is twofold. Firstly, amorphous silicon is a technologically highly significant material with many applications such as photovoltaic cells or thin-film transistors. Secondly, physically it is a fundamentally interesting material which has been reg...

Articles you may be interested in Progressive structural and electronic properties of nano-structured carbon atomic chains Nanostructural interpretation for elastic softening of amorphous carbon induced by the incorporation of silicon and hydrogen atoms Comparative analysis of electronic structure and optical properties of crystalline and amorphous silicon nitrides Electron cyclotron resonance ...

OBJECTIVE The aim of this study was to compare the image quality and radiation dose in chest imaging using an amorphous silicon flat-panel detector system and an amorphous selenium flat-panel detector system. In addition, the low-contrast performance of both systems with standard and low radiation doses was compared. MATERIALS AND METHODS In two groups of 100 patients each, digital chest radi...