共查询到19条相似文献,搜索用时 453 毫秒
1.
用分子束外延技术(MBE)生长了GaAs基共振隧穿二极管(RTD)的材料结构,利用X射线双晶衍射(XRD)方法对材料进行了测试分析.结果表明,材料的双晶衍射峰半峰宽达到16.17",GaAs层与In0.1Ga0.9As层的相对晶格失配率仅为0.015 6%.对实验样品进行了双晶衍射回摆曲线的模拟,模拟结果与测试结果符合较好,说明生长的RTD材料结构与设计相符合.通过制成器件对材料进行验证,室温下对器件进行直流测试,PVCR达到5.1,峰值电流密度达到73.6 kA/cm2. 相似文献
2.
3.
X射线双晶衍射仪系统中受参考晶体分辨率等因素的影响,X射线的相干长度不超过1 μm.X射线在异质外延晶体材料内衍射时,不超过相干长度范围内厚度外延层中的衍射波会产生相干叠加,否则,产生非相干叠加.分子束外延(MBE)生长了短周期InGaAs/GaAs超晶格,在其摇摆曲线中观察到显示X射线在超晶格结构中衍射相干特征的多级卫星峰及Pendell(o)song干涉条纹,并利用相干光理论对超晶格结构信息诸如周期及"0"级峰位置等进行了分析. 相似文献
4.
5.
6.
7.
8.
分析了GaAs/GaAlAs阴极粘结工艺中应力产生的根源和晶体中应力对X射线双晶衍射峰的宽度和强度的影响。用X射线双晶衍射仪测量了阴极和玻璃热粘结工艺过程中阴极材料外延层和衬底的双晶回摆曲线。 相似文献
9.
分析了GaAs/GaAsAl阴极粘结工艺中应力产生的根源和晶体中应力对X射线双晶衍射峰的宽度和强度的影响,用X射线双晶衍射仪测量阴极和玻璃热粘结工艺过程中的阴极材料外延层和衬底的双晶回摆曲线,实验结果表明,GaAs/GaAsAl阴极粘结工艺没有带来明显的附加应力,外延层衍射角的展宽是由于GaAs阴极组件窗玻璃的非晶态性所致。 相似文献
10.
11.
设计并用分子束外延(MBE)法制备了不同沟道结构的GaAs PHEMT材料,采用高分辨率X射线双晶衍射仪(DCXRD)、应力测试仪和霍尔测试仪对样品的结晶质量、薄层组分和厚度偏差、应力以及电子迁移率进行了分析表征。探讨了外延片应力与沟道结构的相关性,研究了沟道失配应力对电性能的影响机理。建立了GaAs PHEMT材料热应力引起电子传输特性退化的试验方法,进行了高温和低温存储后材料电性能的演化行为测试,并归纳了热应力引起材料电特性退化的实验结果。结果表明GaAs PHEMT材料经高、低温存储并恢复室温后仍能保持原有电性能,沟道应力对材料电性能的影响主要表现为失配应力。 相似文献
12.
13.
InGaAs(P)/InP应变量子阱和超晶格的光电性质 总被引:1,自引:0,他引:1
利用低压金属有机化合物化学汽相沉积(MOCVD)生长技术在InP衬底上生长InGaAs/InP应变量子阱,超晶格和InGaAsP/InP量子阱结构材料,利用77K光荧光(PL)测量这一应变量了阱和量子阱的光学性质,利用双晶X光测量应变超晶格的性质。 相似文献
14.
Two kinds of superlattices (i) with and (ii) without growth interrupt (GI) after deposition of 1.77 monolayers (ML) of InAs on GaAs (0 0 1) were grown by solid-source molecular beam epitaxy (MBE) and assessed by transmission electron microscopy (TEM) techniques, double crystal X-ray diffraction (DCXRD) and photoluminescence (PL) measurements in order to gain an understanding of the structural and compositional properties. In case (i) formation of coherent dislocation free self-organized quantum dots (SOQDs) with 2.8-3.2 nm height and 13-16 nm lateral size was observed, whereas in case (ii) no quantum dots had formed. In order to better understand the implication of growth interruption for the formation mechanism, highly localised assessment of the composition of the QD was carried out via atomic resolution Z-contrast imaging and electron energy loss spectroscopy (EELS). 相似文献
15.
Si1-xGex/Si应变材料的生长及热稳定性研究 总被引:2,自引:1,他引:1
利用分子束外延(MBE)技术生长了Ge组份为0.1-0.46的Si1-xGex外延层。X射线衍射线测试表明,SiGe/Si异质结材料具有良好的结晶质量和陡峭界面,其它参数与可准确控制。通过X射线双晶衍射摆曲线方法,研究了经700℃、800℃和900℃退火后应变SiGe/Si异质结材料的热稳定性。结果表明,随着退火温度的提高,应变层垂直应变逐渐减小,并发生了应变弛豫,导致晶体质量退化;且Ge组分越小,Si1-xGex应变结构的热稳定性越好;室温下长时间存放的应变材料性能稳定。 相似文献
16.
硅衬底GaN基LED外延生长的研究 总被引:1,自引:1,他引:0
采用在AlN缓冲层后原位沉积SiN掩膜层,然后横向外延生长GaN薄膜.通过该法在硅衬底上获得了1.7 μm无裂纹的GaN薄膜,并在此基础上外延生长出了GaN基发光二极管(LED)外延片,其外延片的总厚度约为1.9 μm.采用高分辨率双晶X-射线衍射(DCXRD)、原子力显微镜(AFM)测试分析.结果表明,GaN薄膜(0002)面的半峰全宽(FWHM)降低到403 arcsec,其表面平整度得到了很大的改善;InGaN/GaN多量子阱的界面较平整,结晶质量良好.光致发光谱表明,GaN基LED峰值波长为469.2 nm. 相似文献
17.
18.
L. Sun D. H. Zhang H. Q. Zheng S. F. Yoon C. H. Kam 《Materials Science in Semiconductor Processing》2001,4(6)
This paper reports characterization of n-type strained InGaAsP/InP multiple quantum well (MQW) structures, grown by solid source molecular beam epitaxy (MBE), using high-resolution X-ray diffraction. It was found that well-defined periodic satellite peaks up to 20 orders and the Pendellösung fringes appeared between the satellite peaks were observable, indicating a very high crystalline quality of the MQW structures. The data extracted from the rocking curves, including position and FWHM of the zero-order peak, the angle separation between diffraction peaks and the intensity of the first-order peak, indicate that high-quality InGaAsP/InP MQW structures with controllable well width and sharp interfaces can be successfully grown using all solid sources, and the well width has no significant effect on the quality of the interfaces. These observations are in good agreement with the simulated results using dynamical X-ray theory. 相似文献
19.
《III》1996,9(4):33-36
Most physics undergraduates will have encountered the potential well as their first problem in undergraduate quantum mechanics. New crystal growth techniques such as molecular beam epitaxy (MBE) have made it possible to produce quantum wells in practice. This sophisticated technology for the growth of high quality epitaxial layers of compound semiconductor materials on single crystal semiconductor substrates is becoming increasingly important for the development of the semiconductor electronics industry. In the second part of this 2-part feature we get to grips with production by way of two companies, one merchant and the other a captive producer of electronic devices by multiwafer MBE. 相似文献