2014 The variation of the photoconductivity versus photon energy is reported for samples deposited at 150 °C, 190 °C and 250 °C at low (30 Å/min.) and high (~ 150 Å/min.) deposition rates. The spin densities of the same samples are also reported. Taking into account the hydrogen concentration and distribution in these samples, a model according to the photoconductivity is mainly limited by the ...

2014 The photoconductivity of amorphous selenium varies linearly with light intensity. This result cannot be interpreted by the classical mechanism of electron-hole pair generation followed by recombination through gap states. We assume that the incident photons create photoinduced defects whose structure is IVAP-like. The optical or thermal excitation of those defects yields the photoconductiv...

The spectral dependence of the persistent photoconductivity in GdBa2Cu3O6.3 was measured in the nearinfrared to the ultraviolet energy range. The excitation efficiency is strongly enhanced for a photon energy of 4.1 eV. Photons with this energy create electron-hole pairs close to oxygen vacancies in the Cu-O chain layers. Therefore, the probability for the excited electron to be trapped at an o...

In this paper, the study of the recombination of non-equilibrium charge carriers and determination of recombination mechanisms in Ge/Si heterostructures with nanoislands have been presented. The effects of long-term photoconductivity decay in Ge/Si heterostructures with Ge nanoislands have been found as caused by variations of the electrostatic potential in the near-surface region of Si(100) su...

Thin films of GaN and its alloy AlGaN are investigated with respect to their properties of the persistent photoconductivity (PPC). In this work, we show that the film-substrate interface plays an important role for the metastable electrical effect. Strongly absorbed bandgap light causes an increase of photoconductivity which is about one order of magnitude higher when the sample is illuminated ...

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We have measured the low-energy excitonic transitions of chiral assigned individual large-diameter semiconducting single-walled nanotubes using a high-resolution Fourier transform photoconductivity technique. When photoconductivity is complemented by Rayleigh scattering spectroscopy, as many as five optical transitions can be identified on the same individual nanotube over an energy range of 0....

We review work done at UCSD on persistent photoconductivity and photoinduced superconductivity in REBa,Cu~O, thin films. It is shown that the resistivity, Hall coefficient and c-axis parameter change significantly upon illumination. All these effects require the presence of oxygen vacancies. The maximum enhancement of the conductivity with illumination occurs for fully deoxygenated ,samples (x=...