共查询到20条相似文献,搜索用时 431 毫秒
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为给金属氧化物半导体场效应功率管(Power MOSFET)在航天系统中的应用提供辐照数据基础和依据。用60^Co源对将应用于空间系统的两种Power MOSFET进行了不同总剂量的辐照实验。从微观氧化物陷阱电荷和界面态的辐射感生角度,分析了Power MOSFET器件在60^Co γ,射线辐射下的总剂量和剂量率效应以及辐照后70℃退火特性。试验表明与N沟道Power MOSFET相比,P沟道Power MOSFET可能更适合空间应用。 相似文献
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为了对N36合金管材的微观结构和应用性能进行优化和调控,通过分析不同最终退火温度(520~560℃)下N36合金管材的性能数据,研究了最终退火温度对N36合金管材微观结构和性能的影响。经过研究发现,不同最终退火温度对于N36合金管材中的第二相粒子影响不大,主要影响N36合金管材的再结晶程度和晶粒尺寸,最终退火温度越高,则N36合金管材的再结晶程度越高,晶粒尺寸越大。随着最终退火温度升高,N36合金管材的室温和高温轴向和环向的强度明显降低,同时延伸率明显升高,主要是最终退火工艺对N36合金管材再结晶程度和晶粒尺寸的影响所造成的。随着最终退火温度升高,N36合金管材耐腐蚀性能提高,560℃最终退火温度的N36合金管材耐腐蚀性能明显优于其他管材,主要是560℃最终退火温度的N36合金管材再结晶程度最高所造成的。 相似文献
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国际上最早使用的微型探测器是盖革-缪勒计数器,并用它首次对活体内的肿瘤进行了测试。六十年代以来,它逐步为半导体探测器所代替。七十年代以来,微型半导体探测器已广泛地用于血流动力学、肺功能研究以及食管、胃和眼睛等体内和体表器官的诊断。我们也曾用半导体硅探测器对甲状腺节结进行过测试,效果良好。 相似文献
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Tsutomu Shimizu-Iwayama Takayuki Hama David E. Hole Ian W. Boyd 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2005,230(1-4):203-209
Potentialities of rapid thermal annealing to enhance the photoluminescence emission of Si nanocrystals in SiO2 have been investigated. Ion implantation was used to synthesize specimens of SiO2 containing excess Si with different concentrations. Si precipitation to form nanocrystals in implanted samples takes place with a conventional furnace anneal. The photoluminescence intensity and the peak energy of emission from Si nanocrystals depend on implanted ion fluence. Moreover, the luminescence intensity is strongly enhanced with a rapid thermal anneal prior to a conventional furnace anneal. The luminescence intensity, however, decreases with a rapid thermal anneal following a conventional furnace anneal. It is found that the order of heat treatment is an important factor in intensities of the luminescence. Moreover, the luminescence peak energy is found to be dependent, but a little, on thermal history of specimens. Based on our experimental results, we discuss about the mechanism of an enhancement of the photoluminescence, together with the mechanism of photoemission from encapsulated Si nanocrystals produced in a SiO2 matrix by ion implantation and annealing. 相似文献
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1 Introduction Relaxed SiGe layers have gained considerable attention due to their applications in strained Si/SiGe high electron mobility transistor, metal-oxide-semi- conductor field-effect transistor (MOSFET) and other devices. High-quality relaxed SiGe templates, espe- cially those with low threading dislocation density and smooth surface, are crucial for the electrical perform- ance of devices.[1,2] In order to realize high-quality relaxed SiGe layer with such good characteristics, … 相似文献
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K. Volz J. K. N. Lindner B. Stritzker 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1996,120(1-4):133-138
Epitaxial, buried silicon carbide (SiC) layers have been fabricated in (100) and (111) silicon by ion beam synthesis (IBS). In order to study the ion beam induced epitaxial crystallization (IBIEC) of buried SiC layers, the resulting Si/SiC/Si layer systems were amorphized using 2 MeV Si2+ ion irradiation at 300 K. An unexpected high critical dose for the amorphization of the buried layers is observed. Buried, amorphous SiC layers were irradiated with 800 keV Si+ ions at 320 and 600°C, respectively, in order to achieve ion beam induced epitaxial crystallisation. It is demonstrated that IBIEC works well on buried layers and results in epitaxial recrystallization at considerably lower target temperatures than necessary for thermal annealing. The IBIEC process starts from both SiC/Si interfaces and may be accompanied by heterogenous nucleation of poly-SiC as well as interfacial layer-by-layer amorphization, depending on irradiation conditions. The structure of the recrystallized regions in dependence of dose, dose rate, temperature and crystal orientation is presented by means of TEM investigations. 相似文献
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T.S. Iwayama T. Hama 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(19):3203-3206
Si ion implantation was widely used to synthesize specimens of SiO2 containing supersaturated Si and subsequent high temperature annealing induces the formation of embedded luminescent Si nanocrystals. In this work, the potentialities of excimer UV-light (172 nm, 7.2 eV) irradiation and rapid thermal annealing (RTA) to enhance the photoluminescence and to achieve low temperature formation of Si nanocrystals have been investigated. The Si ions were introduced at acceleration energy of 180 keV to fluence of 7.5 × 1016 ions/cm2. The implanted samples were subsequently irradiated with an excimer-UV lamp. After the process, the samples were rapidly thermal annealed before furnace annealing (FA). Photoluminescence spectra were measured at various stages at the process. We found that the luminescence intensity is strongly enhanced with excimer-UV irradiation and RTA. Moreover, effective visible photoluminescence which is not observed with a simple FA treatment, is found to be observed even after FA at 900 °C, only for specimens treated with excimer-UV lamp and RTA. Based on our experimental results, we discuss the effects of excimer-UV lamp irradiation and RTA process on Si nanocrystals related photoluminescence. 相似文献
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S.R. Bhattacharyya D. Datta T.K. Chini D. Ghose I. Shyjumon R. Hippler 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(8-9):1432-1435
In this study, morphologies of as-deposited and rapid thermal annealed films of silver nanoclusters are studied using scanning electron microscope (SEM) and atomic force microscope (AFM). Size-selected silver nanoclusters, containing 5000 atoms in a cluster, produced by the gas condensation method are deposited on Si substrate for a period of 8 min. In order to get an idea about the melting of clusters, the film is treated by rapid thermal annealing at 200 and 400 °C. The remarkable changes of morphology due to annealing signify a lowering of melting temperature of silver in the form of nanoscale particles. 相似文献
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W. Skorupa R. A. Yankov L. Rebohle H. Fr b T. B hme K. Leo I. E. Tyschenko G. A. Kachurin 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1996,120(1-4):106-109
Thermal SiO2 films have been implanted with Si+ ions using double-energy implants (200 + 100 keV) at a substrate temperature of about −20°C to total doses in the range 1.6 × 1016−1.6 × 1017 cm−2 followed by short-time thermal processing, in order to form a Si nanostructure capable of yielding blue photoluminescence (PL). The intensity and the peak position of the PL band have been investigated as a function of ion dose, manner of heat treatment, anneal time and anneal temperature. For the formation of blue PL emitting centres, optimum processing conditions in terms of excess Si concentration and overall thermal budget are mandatory. The nature of the observed blue emission is discussed. 相似文献
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《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,259(2):871-874
FeSi2 precipitates with various structural properties embedded within silicon matrix were formed by iron ion implantation using a metal vapor vacuum arc ion source followed by thermal annealing at various conditions. The microstructure and phase properties of the implanted samples were studied by transmission electron microscopy. The orientation relationships and thus the interfacial coherence between the FeSi2 precipitates and the Si matrix were observed to change with the annealing conditions. A good correlation is identified in-between the structural properties and the photoluminescence properties of these samples. 相似文献
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Thermal solid phase epitaxial growth and ion-beam induced crystallisation of Ge ion implanted layers in silicon 总被引:2,自引:0,他引:2
P. Songsiriritthigul G. Holm n 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1996,120(1-4):207-211
Solid phase epitaxial growth (SPEG) of amorphous SiGe layers in Si has been investigated. The amorphous layers were formed by 40 keV 74Ge+ ion implantation in Si(100) single crystals with doses giving 22 at.% Ge at the maximum of the ion implanted distribution of Ge. SPEG of the amorphous layers was achieved by either thermal SPEG or a combination of thermal SPEG and ion-beam induced crystallisation (IBIC). The crystal quality of the layers was investigated by Rutherford backscattering spectrometry and transmission electron microscopy. Fully crystallised SiGe alloy layers were obtained by annealing in a furnace at 550°C for 60 min or at 850°C for 20 min. However, the SiGe alloy layers contain extended defects formed at the relaxation of the built-in strain in the alloy layer. When the combination of thermal SPEG and IBIC was used for the SPEG very few of these defects were formed. 相似文献
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M.K. Sharma Matthias Voelskow Ratnamala Chatterjee 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(10):1631-1636
We report thermal annealing and 100 MeV Si8+ swift heavy ion irradiation effects on the structural and magnetic properties of Ni-implanted HfO2 thin films. At low Ni doping concentration (∼1%), HfO2 thin films show ferromagnetic behavior. We clearly demonstrate the cluster free nature of our film using cross-sectional high resolution transmission microscopy and magnetization vs. temperature data. Rutherford backscattering spectrometry is used to estimate the film thickness and to establish that Ni-ions are placed in the HfO2 matrix. By comparing the results for the annealed and swift heavy ion irradiated samples, it is concluded that the enhancement in magnetic signal is closely related to the dispersion/diffusion of implanted Ni and defect creation such as oxygen vacancies. The results of magnetic force microscopy supported the observation of room temperature ferromagnetism in Ni-implanted HfO2 films. 相似文献