The use of hydrogenated amorphous silicon material(a-Si:H) in devices such as solar cells, active thin film transistor liquid crystal display panels, various sensors, etc. requires an accurate model of the material characteristics and their dependence on light intensity and light soaking over a broad temperature range. Through the use of nonlinear parameter estimation techniques, a gap state mo...

Undoped hydrogenated microcrystalline silicon (lc-Si:H) layers were grown by the very high frequency glow discharge (VHF-GD) technique under various deposition conditions. The electronic transport properties under illumination were investigated by means of steady-state photoconductivity and steady-state photocarrier grating methods. Similarly to hydrogenated amorphous silicon (a-Si:H), power la...

Persisent photoconductivity (PPC) has been investigated in a Znp 02Cdp 98Te semiconductor alloy. A transition from a photoconductivity phase to a PPC phase has been observed and a coexistence curve that separates these two phases has been obtained. We find that such a transition can be controlled by the bias voltage and excitation photon dose. The relaxation of PPC is found to follow a power la...

The photoconductivity of single-crystalline selenium nanotubes (SCSNTs) under a range of illumination intensities of a 633 nm laser is examined using a novel two-terminal device arrangement at room temperature. It is found that SCSNTs forms Schottky barriers with W and Au contacts, and the barrier height is a function of the light intensity. In the low-illumination regime below 1.46 × 10−4 μW μ...

Recent developments in the preparation of surfactant-templated mesostructured sol-gel silica materials have extended the morphology from the originally discovered powders, with particle sizes on the order of microns, to mesoporous continuous thin films. These films could find applications in membrane-based separations, selective catalysis and sensors. Particularly, sodium dodecyl sulfate (SDS)t...

We present a detailed study, on time scales from picoseconds to seconds, of transient and continuous wave cw photoconductivity in solution-grown thin films of functionalized pentacene Pc , anthradithiophene ADT , and dicyanomethylenedihydrofuran DCDHF . In all films, at temperatures of 285–350 K, we observe fast carrier photogeneration and nonthermally activated charge transport on picosecond t...

Highly photoconductive thin films of inorganic-capped PbS nanocrystal quantum dots (QDs) are reported. Stable colloidal dispersions of (NH4)3AsS3-capped PbS QDs were processed by a conventional dip-coating technique into a thin homogeneous film of electronically coupled PbS QDs. Upon drying at 130 °C, (NH4)3AsS3 capping ligands were converted into a thin layer of As2S3, acting as an infrared-tr...

We study theoretically transverse photoconductivity induced by circularly polarized radiation, i.e., the photovoltaic Hall effect, and linearly radiation causing intraband optical transitions in two-dimensional electron gas (2DEG). develop a microscopic theory of these effects based on analytical solution Boltzmann equation for arbitrary spectrum scattering mechanisms. calculate 2DEG with parab...

The features of photoconductivity and luminescence CdS thin films Cd 1-x Zn x S solid solutions obtained by chemical pulverization with subsequent pyrolysis under laser excitation have been studied experimentally. Pulsed liquid (473-547 nm) nitrogen (337 lasers were used as a radiation source. An experimental study was made the photoluminescence spectra depending on composition at different int...