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Al-doped n-ZnO/p-Si heterojunctions were fabricated using a sol–gel dip coating technique at 700 °C, in a nitrogen ambient.
The structural, optical, and electrical properties of ZnO:Al thin films, and the heterojunction properties of ZnO:Al/p-Si
were investigated with respect to the effects of Al doping concentration. Hexagonal nano-structured ZnO: Al thin films with
a 1.2% and a 1.6 at.% Al concentration exhibited high optical transmittance in visible ranges. Electrical resistivity changed
with respect to Al doping concentration, and minimum resistivity was detected at a 1.2 at.% Al concentration. The ZnO:Al/p-Si
heterojunction properties were analysed using current–voltage (I–V) measurements at four different Al concentrations, ranging
from 0.8 to 1.6 (at.%). The ZnO:Al/p-Si heterojunctions exhibited diode-like rectifying behaviour. Under UV illumination,
the photoelectric behaviour observed for the ZnO:Al/p-Si heterojunctions was diode. 相似文献
2.
Neutron and mixed gamma and neutron irradiation, at different absorbed doses, of borosilicate glass with four different chemical compositions was conducted to investigate the effects on the solar properties of the glass. Irradiation was performed in the tangential beam tube and central thimble of a nuclear reactor. The effect of thermal and epithermal neutrons on such solar properties as secondary heat-transfer factor, solar factor (the total solar energy transmittance), and shading coefficient of the borosilicate glass were investigated to determine the effect on the solar properties of borosilicate glass, because of its neutron absorbance property. 相似文献
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Nuclear-grade Zircaloy-4(R) tubes are produced by a unique manufacturing process known as pilgering, which leaves the material
in a work-hardened state containing a pattern of residual stresses. Moreover, such tubes exhibit elastic anisotropy as a result
of the pilgering process. Therefore, standard equations originally proposed by Sachs (Z Met Kd, 19: 352–357, 1927; Sachs, Espey, Iron Age, 148: 63–71, 1941). for isotropic materials do not apply in this situation. Voyiadjis et al. (Exp Mech, 25: 145–147, 1985) proposed a set of equations for treating elastically anisotropic materials, but we have determined that
there are discrepancies in their equations. In this paper, we present the derivation for a set of new equations for treating
elastically anisotropic materials, and the application of these equations to residual stress measurements in Zr-4(R) tubes.
To this end, through thickness distribution of residual stress components in as-received and heat treated (500°C) Zr-4(R)
tubes was measured employing the Sachs’ boring-out technique in conjunction with electrochemical machining as the means of
material removal, and our new equations. For both as-received and the heat treated materials, the axial and tangential residual
stresses were significantly higher than the radial and shear residual stresses. The largest residual stress was the tangential
stress component in the as-received material, showing a tensile value at the outer surface and a compressive value at the
inner surface. At high values of von Mises equivalent stress, the principal directions of residual stress coincided with the
principal axes of the tube for the as-received material, as well as for the material heat treated at 500°C. 相似文献
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