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Gold - silicon surface barrier sensor failure in the hydrogen environment issues

A silicon surface barrier mechanism of the probe affected the theory. In order to solve the hydrogen spectrum measurement environment issues that affect the mechanism of this year for the experimental validation of a silicon surface barrier of gold probe after the resistance of hydrogen and alternative probe of the hydrogen environment. Gold probe by a silicon surface barrier effect is mainly due to hydrogen when the hydrogen into the lattice of silicon by atomic lattice interaction of the hydrogen atoms into hydrogen atoms easily lose an electron, so resistivity of semiconductor devices decrease, while the width of the barrier is proportional to the resistance and voltage. When the width of the barrier with lower resistivity to the particle energy enough to make all the losses in the barrier region,UGG España, it will surely make the output pulse amplitude and reduced when the pulse amplitude and electronics is not quite the level of noise pulse does not affect the number of pulses, it does not produce the phenomenon of decline in detection efficiency. To test this theory, in gold and one affected by hydrogen silicon surface barrier effect of the probe, increasing the operating voltage of the probe, the manner by increasing the voltage to offset the decline in electrical resistivity caused by the decline in the width of the barrier, the changes observed energy spectrum situation. In normal circumstances, the probe bias is 54V, 0.5h after the hydrogen charging, 2u energy peak shift to about 790. Then transferred to the operating voltage of 2 times normal circumstances, have been measured, the experimental results shown in Figure 1 and Figure 2. Figure l gold silicon surface barrier of the probe by the hydrogen spectrum in Figure 2, after 0.5h 2-fold increase in bias spectra of Figure 3 after probe implantation after 22h in the hydrogen spectrum is evident from the figure, and theoretical assumptions of the same, when the partial pressure is increased, the peaks returned to normal work, a good mechanism to verify the impact of ideas. Two ways using a silicon surface barrier of gold probes were hydrogen treatment resistance, a gold surface is coated directly on the hydrogen resistance of polymer materials, the other is put on the surface layer of Mylar in the sensor film, using epoxy to seal around the crystal. Directly on the gold surface coated with hydrogen resistance of polymer materials, the experimental results show that, due to the absorption, the hydrogen in the barrier, but also blocked most of the particles, resulting in very serious decline in the peak position and resolution change poorly. In addition,uggs outlet rotterdam, as material directly applied to the gold surface of gold will inevitably cause some side effects, leading to the probe of the electronic noise becomes larger. Put on the surface in a layer of Mylar film probe, using epoxy to seal around the crystal, the experimental results show that the permeability of hydrogen is too strong,Ed Hardy outlet, the resistance of hydrogen results in this way is not very satisfactory, is still able to peak to the direction of the phenomenon of low energy drift, but delayed the drift of time. Type of probe with the ion implantation of a silicon surface barrier instead of gold probe, the environmental conditions of hydrogen. The results show that hydrogen charging were found after the peak shift, then type the probe implanted in the hydrogen environment placed after 22h was measured spectra shown in Figure 3, measurement results are 82 Annual Report of China Academy of Engineering Physics Science and Technology Chang no different than the case, that type of ion implantation of the probe independent of hydrogen, hydrogen can be used to measure the spectrum of environmental conditions. 2-40 neutron reflection spectrometer tube front-end analog front-end catheters and optimization Huangchao Jiang Bo in the forefront of neutron reflection spectrometer after the beam gate,tory burch shoes, mainly to adjust the neutron beam and to avoid fast and straight through neutron role, often referred to as beam deflection catheter. Two different front-end for the current catheter design, structure and design structure that is proposed, given by the appropriate structure simulation and optimization is necessary. Proposed structure, the catheter is a pair of parallel vertical mirror and a pair of ultra-narrow ladder over the exit mirror the composition of catheters (Super Mirror factor m = 2.5) with a focus on function, can increase to the beam in the exit strength. All the super-mirror coated non-magnetic layered structure material NiMo / Ti, super mirror parameters are = 2 (vertical) and m = 2.5 (horizontal). Duct entrance cross-section 4mm (W) x200mm (H), exit section is 4mm (W) x40mm (H), tube length of 8.0m. ZJnm Figure 1 were deflected catheter exit-based neutron flux 0 1 0 Dan oak draw ridicule 3624681012 catheter length / m Table 1, under the proposed program and conceptual design parameters of neutron beam deflection tube exit compared 10015O2o0 entrance height, mmV tired { chase * 1O2O3O4O5O6O (Ib/o.5-1) �� 10 + (mIb/o5-1) Figure 2 deflection tube neutron flux at the exit tube length to its deflection, import high and super mirror factor tb and Ir, respectively, super mirror up and down and left and right) relationship 8642OT �� I. II a valve Ba Ba �� field 05O5O533221T �� 'uI. II a valve ridicule column