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References in periodicals archive ?
This work chose niobium due to the abundance and low cost of niobium ([Nb.sub.2][O.sub.5], [Nb.sup.0]) allied with the advantages brought with the structural modification by doping (n-type extrinsic semiconductor/excess of electrons and defects generation) and superficial modification (oxygen vacancies and formation of antennae) both improving charge separation and increasing the electron-hole pair recombination time.
The reduced photogenerated electron-hole pair recombination and the enhanced visible-light absorbance with the introduction of rGO are mainly responsible for the enhanced photocatalytic activity of the MFO/rGO composite.
If they would be absorbed within the depleted region, the generated electron-hole pair would be separated quickly.
The secondary electron-hole pair in turn generates another electron-hole pair, leading to snowball avalanche process.
The underlying mechanism for the coupled optical-electrical processes is as follow: (1) electron-hole pairs are generated in the device upon light illumination.
The first is the generate where the reverse current is slightly increased with the applied voltage and this tends to generation of electron-hole pairs at low bias.
These optical losses can be connected to the excitation by a field of incoherent electron-hole pairs. This phenomenon is called Landau damping, which is described by Eq.
The photocatalytic activity of [TiO.sub.2] is under the influence of its crystalline structure, surface area, crystalline size, bandgap, surface hydroxyl group density as well as the number of electron-hole pairs that participate in the formation of active radicals.
Electrons interacting with silicon create electron-hole pairs. Due to the applied electric field, electrons move towards the anode and holes move towards the cathode to generate electrical signals, which were amplified with the circuit shown in Fig.
In this case, hot electrons create new electron-hole pairs only when they collide with Si-Si bonds in the lattice, so photons are emitted more narrowly, generally only from the junction itself.
The complex electron-hole pair, now involving both molecules, then decays by photon emission at wavelengths considerably longer than those emitted by either individual molecule.
Each free electron-hole pair created by a photon is called an exciton.
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