Ac and Dc conductivity in amorphous silicon-hydrogen films

Radscheit, H.; Breitschwerdt, K.G.

doi:10.1016/0038-1098(83)90699-3

Cited by 5 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8 illustrates the variation of the conductance as function of 1000/T for RF/VOX-650 °C sample. The curve shows temperature dependence in accordance with (Eq.8) [71]:…”

Section: Resultssupporting

confidence: 66%

Production and characterization of carbon-vanadium nanocomposites

Jeidi

Ahmed

Najeh

et al. 2022

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Carbon-vanadium nanocomposites were prepared using sol-gel route after the incorporation of vanadium pentoxide nanoparticles in carbon matrix based on resorcinol-formaldehyde xerogel, coupled by pyrolysis treatment. The obtained samples were characterized using several techniques, X-ray diffraction XRD, Scanning electron microscopy SEM, RAMAN spectroscopy, Fourier transform infrared FTIR spectroscopy and electrical analysis. The XRD analysis carried out on our samples exhibit that the pyrolysis temperature brings out the crystal phase change of V2O5 nanoparticles to V2O3 nanoparticles. The RAMAN and FTIR analysis confirm the XRD results. The SEM graphs indicate the presence of macroporous carbon nanoparticles and the vanadium nanoparticles are microspheres formed of nanorods. In this work we are interested of the percolation zone from 600 to 800 °C where the behavior of the material changes from insulator state to conductor state as function of pyrolysis temperature.For that, the electrical analyses were carried out for sample RF/ VOX-650 °C. The dc conductance indicates a thermally activated process. The ac conductance shows a semiconductor-metal phase change at 200 K. Indeed, the transfer of charge carriers is dominated by the correlated barrier hopping (CBH) conduction model in this material for measurement temperatures below 200 K. The impedance analysis exhibits a non-Debye relaxation phenomenon in the system. An electrical equivalent circuit has been proposed to interpret the impedance results and to determine the fundamental parameters of the circuit at different temperatures in order to estimate the contributions of the grains to the conductivity.

show abstract

“…8 illustrates the variation of the conductance as function of 1000/T for RF/VOX-650 °C sample. The curve shows temperature dependence in accordance with (Eq.8) [71]:…”

Section: Resultssupporting

confidence: 66%

Production and characterization of carbon-vanadium nanocomposites

Jeidi

Ahmed

Najeh

et al. 2022

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…All existing models, working either with tunnelling between localized states randomly distributed in space and energy or with hopping over the barrier between them, exhibit some shortcomings: Only with difficulty can they account for the variety of frequency exponents observed experimentally (e 0.4 5 s 5 1.2); the frequency interval in which the experimentally observed exponent remains constant is much larger than the relatively small range in which the theoretical values are in agreement with experiment [9]. I n addition, the assumption of phonon-assisted mechanisms requires often unphysically large values of the phonon frequencies (e.g.…”

Section: Introductionmentioning

confidence: 99%

A new model for ac conduction in disordered solids

Stumpe

1985

phys. stat. sol. (a)

View full text Add to dashboard Cite

A new model based on a spatial electrical inhomogeneity of the material is presented to describe the ac conductivity of disordered solids. With the central assumption that both the dc and the ac conductivity are due to the same mechanism, the model calculation fits quantitatively the ac response against both temperature and frequency of some different amorphous solids. The analysis accentuates the difficulties and uncertainties which arise in deducing microscopic properties from ac conduction data. The model calculation suggests that at least in the high temperature regime processes working at the Fermi‐level do not determine the ac behaviour of disordered solids.

show abstract

AC electrical conductivity of a-Si:H

Schirone

Guseinov

Ferrari

et al. 1992

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

The electrical conductivity of a‐Si:H films is measured in the frequency range of 100 to 6 × 106 Hz and in the temperature range 300 to 450 K. Loss peaks are detected, whose amplitude is affected by the Staebler‐Wronski effect, being enhanced by exposure to light and reduced by thermal annealing. The observed behaviour is dibed in terms of the superposition of two mechanisms of ac conduction: the loss peaks can be described in terms of a Simple Pair Hopping model, superimposed to a wideband behaviour described by the Correlated Barrier Hopping model.

show abstract

Ac and Dc conductivity in amorphous silicon-hydrogen films

Cited by 5 publications

References 8 publications

Production and characterization of carbon-vanadium nanocomposites

Production and characterization of carbon-vanadium nanocomposites

A new model for ac conduction in disordered solids

AC electrical conductivity of a-Si:H

Contact Info

Product

Resources

About