Electron transport in the porous nanostructured titanium oxide, as a main concern dye-sensitized solar cells, was investigated by random walk simulation. Geometrically disordered nanoparticle networks with distribution of energy generated and utilized for simulations. Dependency diffusion coefficient (Def) on nanoparticles size, grains connectivity, network porosity completely studied two cases: traps are placed mainly surface or volume nanoparticles. It shown that Def is independent size...

Nonlinear recombination in dye-sensitized solar cells was studied from a fundamental point of view. A model based on Marcus theory used to describe the both conduction band and trap states. By combination this with empirical form nonlinear recombination, dependency reaction order (β) microscopic parameters cell investigated. It analytically shown that β is always less than unity also depends quasi Fermi-level semiconductors. nonconstant β, ideality factor (m), electron diffusion length (Ln),...

In order to fulfill fast electron transport and low recombination rate in dye-sensitized solar cells, we propose utilize a micro-patterned anode based on TiO2 nanoparticles. The micro-structures of the mesoporous films were patterned by Si molds (microimprint technique). A series measurements including time flight, open circuit voltage decay, charge extraction is carried out investigate these structures. Our measurement confirms high lifetime structures, which agreement with previously...

We propose a novel Surface Plasmon Resonance (SPR)-based sensor that detects dew formation in optical fiber-based smart textiles. The proposed SPR facilitates the observation of two phenomena: condensation moisture and evaporation water molecules air. This less than 0.25 s, determines point temperature with an accuracy 4%. It can be used to monitor layer depth changes during range plasmon probe, i.e., 250 nm, resolution 7 nm. Further, it estimation relative humidity medium over dynamic 30%...

Electron transport and recombination in electrolyte-filled sensitized nanocrystalline solar cell was investigated using Monte-Carlo simulation. Multiple-trapping an exponential tail of trap states used as electron model. For simulation the recombination, a new approach based on Marcus theory charge transfer developed utilized to simulate both linear non-linear (trap-assisted) electrons with holes electrolyte. results, this approach, reproduced non-constant diffusion length, recently observed...

The possibility of optimization morphological features multiwall carbon nanotubes (MWCNTs) using the statistical design experiments (DoE) is investigated. In this study, MWCNTs were synthesized a catalytic chemical vapour deposition (CCVD) method in horizontal reactor acetylene as source. effects six synthesis parameters (synthesis time, temperature, catalyst mass, reduction flow rate and hydrogen rate) on average diameter mean rectilinear length (MRL) examined fractional-factorial (FFD)...

Bent multiwall carbon nanotubes (CNTs) were grown on silicon substrate by manipulating the direction of electric field during growth process in plasma enhanced chemical vapour deposition system presence hydrogen and acetylene gases. Different geometries as-grown nanostructures employed to fabricate a novel ionization gas sensor. The high sensitivity this sensor low pressures is its main advantage comparison with other sensors. Electrical characteristics fabricated investigated while being...

Carbon nanotube (CNT) arrays were synthesized by plasma-enhanced chemical vapour deposition on a silicon substrate. Cabbage-like TiO 2 nanostructures the CNTs produced atmospheric-pressure deposition. Scanning electron microcopy was used to study morphology of /CNT structures while x-ray diffraction and Fourier transform infrared (FTIR) spectroscopy verify characteristics prepared nanostructures. Their hydrophilicity under UV visible light investigated compared with activity thin films . The...

The performance of Dye-sensitized solar cells (DSC) and related devices made nanostructured semiconductors relies on a good charge separation, which in turn is achieved by favoring transport against recombination. Although both processes occur at very different time scales, hence ensuring certain cases the kinetics recombination can be connected, either direct or an indirect way. In this work, connection between electron studied theoretically Monte Carlo simulation. Calculations using...

In this paper, a novel method of producing nanoparticles at low temperatures using hydrogen bombardment thin films, deposited on glass substrates, is introduced. Silver were obtained by in our Plasma Enhanced Chemical Vapor Deposition system. Optical and morphological characteristics these extensively studied for various conditions plasma treatment, such as power density, temperature, duration bombardment, thickness the initial metallic film etc. addition, Ag-Cu alloy substrates also...

Effects of plasma power on the growth multi-wall carbon nanotubes (CNTs) are reported. CNTs were grown silicon wafers by enhanced chemical vapor deposition (PECVD) method using a mixture acetylene and hydrogen at temperature 650 °C. Plasma powers ranging from zero to 35 W applied samples effects different magnitudes direction investigated. Regular vertically aligned obtained 25 W. In order set during growth, electrical force was ions. Nickel layer used as catalyst, prior step, it treated...

Multiwalled carbon nanotubes are grown on nickel-seeded silicon substrates using plasma-enhanced chemical vapor deposition method at a temperature of 650 °C utilizing mixture acetylene and hydrogen. Magnetic electric fields were used to obtain well-oriented nanotubes. The direction growth was found strongly depend the directions magnitudes applied fields. Scanning electron microscopy (SEM) Transmission (TEM) have been investigate SEM TEM images as show that applying magnetic field during...

AbstractWe introduce the controllable hybrid polishing method (CHPM), which is a combination of enhanced side-polishing and etching methods, leading to more precise clad process for optical fibers. The two key advantages CHPM are enabling real-time monitoring with resolution ~100 nm fabrication 34% smoother polished surface than that traditional methods. Bearing in mind these factors very important any fiber devices, such as plasmonic sensors, should prove highly useful related industrial...

The effect of hydrogenation processing as a pregrowth treatment on carbon nanotubes (CNTs) has been investigated. growth CNTs patterned structures strongly depends the plasma power during step. Etching nickel occurred at higher hydrogen densities. By controlling applied catalyst layer and using refinement process, an array isolated was obtained without nanolithography method. Finally, effects are represented. This study shows that direction grown condition growth.