After annealing for the passivated surface , band bending effect was observed and the offset of 0. 22 eV toward the higher binding energy was obtained this meant that the densenty of the states of GaAs surface was decreased.
The experimental measurements together with the theoretical results indicate that the Bir_Aronov_Pikus (BAP) mechanism plays a dominant role for spin polarization decay, especially in band bending region of GaAs(100).
During the adsorption of Gd on surface, the Mg2p band shifted towards lower kinetic energy of 0.4eV upon the effect of band bending. Moreover, there was a weak reaction between Gd and MgO, and Gd adsorbed on the MgO surface mainly in form of clusters.
By analyzing the experimental results,we can show that the separation of electrons and holes in GaAs1-xSbx /GaAs heterostructure results in band-bending and band-filling effects. The results suggest that GaAs1-xSbx /GaAs heterostructure is Type-II when Sb concentration is between 16 % and 26 % at least.
Such stress field results in the enhancement effect of band-edge emission efficiency and consequently, improves the ultraviolet luminescence intensity.
The parameters of the MQW structures, such as concentration, energy position, and trapping cross sections of deep levels; band bending at the α-C : H/Si interface; potential well depths; etc.
We show that the anomalous behavior of the local tunneling conductivity, which indicates a pronounced enhancement of the semiconductor band gap for the flat areas, is consistent with band bending induced by charges localized at the apex of the tip.
Atomic-size defect clusters contain additional charges which modify the band bending; this explains the different behavior of the tunneling conductivity near the defect cluster.
The experimentally observed oscillations of the tunneling conductivity near the band gap edges can be directly related to resonant tunneling through quantized surface states which appear because of the band bending.
Effect of annealing and light illumination on electrical and optical properties of undoped a-Si :H films were studied. The surface energy band bending is created by H20 adsorbats in order to compare the difference between annealing state and light illumination state. The results show that the density of gap state has been increased by light illumination.
UPS involving core level photoemission peaks (Ga 3d for GaAs and Si 2p for Si)is measured for the (111), (110), (111),and (001)surfaces of GaAs and Si using thelight from a helium lamp (21.2 eV and 40.8 eV) and from the Berlin synchrotron ra-diation source BESSY (108.6 eV),respectively.These surfaces are prepared by ion bo-mbardment and annealing on cylindrically shaped GaAs and Si crystals with [110] astheir axis.The GaAs cylinder is in addition prepared by molecular beam epitaxy yield-ing As-rich phases o...
According to the value of energy difference between Ga3d core level and the valence band maximum of GaAs precisely determined by Kraut et al., the position of Fermi level with respect to the valence band maximum at the surface and the surface band bending of clean GaAs(111) can be determined by measuring the exact binding energy of Ga3d level in the UPS experiment. The electron affinity of GaAs can also be obtained by measuring the work function from the threshold of secondary electron energy distribution i...
能带弯曲
band bending
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