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HgCdTe探测列阵干法技术的刻蚀形貌研究 总被引:4,自引:0,他引:4
首次报道了HgCdTe微台面焦平面探测列阵成形工艺的干法刻蚀技术有关刻蚀形貌的一些研究结果.从HgCdTe外延材料的特点出发,详细分析了其干法刻蚀适用的RIE(reactive ion etching)设备和刻蚀原理.采用高等离子体密度、低腔体工作压力、高均匀性和低刻蚀能量的ICP(inductively coupled plasma)增强型RIE技术,研究了不同的工艺气体配比、腔体工作压力、ICP源功率和RF源功率对HgCdTe材料刻蚀形貌的影响,并初步得到了一种稳定的、刻蚀表面清洁、光滑、图形轮廓良好、均匀性较好和刻蚀速率较高的干法刻蚀工艺. 相似文献
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叙述了围绕第三代红外焦平面的需求所进行的HgCdTe分子束外延以及台面结芯片技术研究的一些成果。对GaAs、Si基大面积异质外延、p型掺杂以及台面刻蚀等主要难点问题进行了阐述。研究表明,7.6 cm(3 in)材料的组分均匀性良好,晶格失配引发的孪晶缺陷可以通过合适的低温成核方法得到有效抑制。在GaAs和Si衬底上外延的HgCdTe材料的(422)X射线衍射半峰宽的典型值为55″~75″。对ICP技术刻蚀HgCdTe的表面形貌、刻蚀速率、反应微观机理、负载效应和刻蚀延迟效应以及刻蚀损伤进行了研究,得到了高选择比的掩模技术和表面光亮、各向异性较好的刻蚀形貌。采用HgCdTe多层材料试制了长波n?蛳on?蛳p以及p?蛳on?蛳n型掺杂异质结器件以及双色红外短波/中波焦平面探测器,取得了一些初步结果。 相似文献
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文章报道了HgCdTe微台面列阵ICP干法刻蚀掩模技术研究的初步结果。首先采用常规光刻胶作为HgCdTe材料的ICP干法刻蚀掩模。扫描电镜结果发现,由于刻蚀的选择比低,所以掩模图形退缩严重,刻蚀端面的平整度差,台面侧壁垂直度低。因此采用磁控溅射生长的SiO2掩模进行了相同的HgCdTe干法刻蚀。结果发现,SiO2掩模具有更高的选择比和更好的刻蚀端面。但是深入的测试表明,介质掩模的生长对HgCdTe表面造成了电学损伤。最后通过优化生长条件,获得了无损伤的磁控溅射生长SiO2掩模技术。 相似文献
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文章报道了HgCdTe微台面列阵ICP干法刻蚀掩模技术研究的初步结果。首先采用常规光刻胶作为HgCdTe材料的ICP干法刻蚀掩模。扫描电镜结果发现,由于刻蚀的选择比低,所以掩模图形退缩严重,刻蚀端面的平整度差,台面侧壁垂直度低。因此采用磁控溅射生长的SiO2掩模进行了相同的HgCdTe干法刻蚀。结果发现,SiO2掩模具有更高的选择比和更好的刻蚀端面。但是深入的测试表明,介质掩模的生长对HgCdTe表面造成了电学损伤。最后通过优化生长条件,获得了无损伤的磁控溅射生长SiO2掩模技术。 相似文献
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基于4H-SiC材料的微机电系统(MEMS)器件(如压力传感器、微波功率半导体器件等)在制造过程中,需要利用干法刻蚀技术对4H-SiC材料进行微加工.增加刻蚀速率可以提高加工效率,但是调节刻蚀工艺参数在改变4H-SiC材料刻蚀速率的同时,也会对刻蚀表面粗糙度产生影响,进而影响器件的性能.为了提高SiC材料的刻蚀速率并降低刻蚀表面粗糙度,满足4H-SiC MEMS器件研制的需求,本文通过优化光刻工艺参数(曝光模式、曝光时间、显影时间)获得了良好的光刻图形形貌,改善了刻蚀掩模的剥离效果.实验中采用SF6和O2作为刻蚀气体,镍作为刻蚀掩模,分析了4H-SiC反应离子刻蚀工艺参数(刻蚀气体含量、腔体压强、射频功率)对4H-SiC刻蚀速率和表面粗糙度的影响.实验结果表明,通过优化干法刻蚀工艺参数可以获得原子级平整的刻蚀表面.当SF6的流量为330 mL/min,O2流量为30 mL/min,腔体压强为4 Pa,射频功率为300 W时,4H-SiC材料的刻蚀速率可达到292.3 nm/min,表面均方根粗糙度为0.56 nm.采用优化的刻蚀工艺参数可以实现4H-SiC材料的高速率、高表面质量加工. 相似文献
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片内热积累效应严重制约GaN器件向高功率密度应用发展,金刚石钝化散热结构的GaN器件热管控技术已成为目前研究重点,而金刚石栅区高精度刻蚀和控制是实现该热管理技术应用的关键工艺难点。因此,本文采用电感耦合等离子体(ICP)刻蚀技术,以氮化硅作为刻蚀掩膜,对纳米金刚石薄膜进行栅区微纳尺度刻蚀工艺研究,系统分析了刻蚀气体、组分占比、射频功率等工艺参数对刻蚀速率的影响。结果表明,ICP源功率与氧气流量对刻蚀速率有增强作用,Ar与CF4的加入对刻蚀过程具有调控作用。最终提出了基于等离子体刻蚀技术的高精度微纳尺度金刚石钝化薄膜刻蚀方法,对金刚石集成GaN器件热管理和金刚石高精度刻蚀技术具有重要的指导意义。 相似文献
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文章将ICP刻蚀技术应用于刻蚀HgCdTe,使用微区X射线光电子光谱学(XPS) 、扫描电子显微镜( SEM)等表面分析技术研究了ICP各工艺参数,包括ICP功率、气体成分与配比、腔体压力等对刻蚀表面形貌、刻蚀后表面成分、聚合物形成的影响。XPS分析结果发现,使用光刻胶作掩模时,刻蚀气体CH4 会与光刻胶发生反应,生成物可能为C6H5 (CH3 ) 。如果腔体压力较高,生成物不能及时被带走,就会附着在样品表面上,使样品表面发黑;当腔体压力较低时,生成物被及时带走,则样品表面光亮,无聚合物残留。光刻胶也会与H2 发生反应,生成多种含C有机物。SiO2 作掩模时,在一定的条件下, CH4 会与SiO2 或者真空硅脂发生反应,生成聚脂薄膜。 相似文献
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文中对Schaake[ 1 ]和Chen[ 2 ]两种腐蚀剂在{111}B的HgCdTe外延材料上形成的腐蚀坑特性进行了研究。通过实验确定了两种腐蚀剂的最佳腐蚀时间,实验结果发现两种方法都在外延材料表面产生了两种不同类型的腐蚀坑, Schaake腐蚀坑是一种为三角形,另一种为腰果状,而Chen腐蚀坑是侧向腐蚀面坡度不同的两种三角形。实验进一步证明Chen的较陡三角形腐蚀坑和Schaake的两种腐蚀坑具有位错腐蚀坑的特性,并且我们发现大部分位错具有穿越特性,而且位错线方向与〈111〉方向具有一定的角度。实验观察发现,宏观缺陷附近的腐蚀坑密度会有比较大的增值。 相似文献
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Traces of HgCdTe Defects as Revealed by Etch Pits 总被引:2,自引:0,他引:2
The characteristics of defects in HgCdTe liquid-phase epitaxy (LPE) epilayers were investigated by using Schaake’s and Chen’s
etches. By tracking the etch pits (EP), two kinds of threading dislocations with <110> and <211> orientations were observed
for the first time in HgCdTe LPE epilayers. They are ascribed to perfect 60 deg dislocation and Shockley partial screw dislocations.
The kinds of dislocation etch pits revealed by Schaake’s and Chen’s etches were experimentally confirmed to be correlated
one-to-one. In addition to the threading dislocation etch pits, another kind of etch pits without the threading feature was
also observed using both etch methods. The density of the nonthreading etch pits increases in the regions close to epilayer-substrate
interfaces, scratched areas, and melt droplets. The etch pit density (EPD) varies from 104 cm−2 to 107 cm−2 from sample to sample or at different places on the same sample, indicating that they are correlated to stresses and should
be considered in the assessment of HgCdTe epilayers. 相似文献
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通过对Schaake和Chen腐蚀剂在HgCdTe外延材料(111)B面腐蚀坑特性的研究,揭示了HgCdTe液相外延材料中的缺陷特征及其密度分布规律.深度腐蚀实验显示外延材料中确实存在着通常认为的具有定向穿越特性的穿越位错.将两种腐蚀剂作用于同一样品后发现,Schaake和Chen腐蚀剂形成的具有穿越特性的腐蚀坑有一一对应的关系.除了穿越位错外,在两种腐蚀方法揭示出的腐蚀坑中都还存在着一种不具备穿越特性的腐蚀坑,两者在密度分布以及界面处密度增值方面具有相同的特性,但前者在宏观缺陷附近密度出现明显的增值,而后者则没有出现类似的现象. 相似文献
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Lithography factors that determine the aspect ratio of electron cyclotron resonance plasma etched HgCdTe trenches 总被引:3,自引:0,他引:3
J. D. Benson A. J. Stoltz P. R. Boyd M. Martinka J. B. Varesi L. A. Almeida K. A. Olver A. W. Kaleczyc S. M. Johnson W. A. Radford J. H. Dinan 《Journal of Electronic Materials》2003,32(7):686-691
Factors that affect width and aspect ratio in electron cyclotron resonance (ECR) etched HgCdTe trenches are investigated.
The ECR etch bias and anisotropy are determined by photoresist feature erosion rate. The physical characteristics of the trenches
are attributed to a combination of photoresist feature geometry and ECR plasma etch chemistry. This knowledge has led to production
of trenches suitable for two-color, 20 μm pitch detectors. 相似文献
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E. Laffosse J. Baylet J. P. Chamonal G. Destefanis G. Cartry C. Cardinaud 《Journal of Electronic Materials》2005,34(6):740-745
We report results on a study on inductively coupled plasma (ICP) etching of HgCdTe using a CH4-based mixture. Effects of key process parameters on etch rates were investigated and are discussed in this article in light
of plasma parameter measurements, performed using a Langmuir probe. Process parameters of interest include ICP source power,
substrate power, pressure, and CH4 concentration. We show that the ICP etching technique allows us to obtain etch rates of about 200 nm/min, which is high enough
to use this technique in a manufacturing process. We also observe that the ion bombardment has a strong influence on HgCdTe
etch rate. Finally, we show that this etch rate is modified by the substitution of methane for hydrogen. 相似文献
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Inductively coupled plasma etching of HgCdTe 总被引:3,自引:0,他引:3
E. P. G. Smith J. K. Gleason L. T. Pham E. A. Patten M. S. Welkowsky 《Journal of Electronic Materials》2003,32(7):816-820
The high-density inductively coupled plasma (ICP) etching technique has been applied to HgCdTe. The HgCdTe etch rate was studied
as a function of key process variables commonly used in high-density plasma etching: chamber pressure, direct current (DC)
bias, and ICP-source power. Mesa profiles were characterized using scanning electron microscopy (SEM), and the profiles for
the process conditions used were found to be compatible with fabrication procedures for HgCdTe infrared focal-plane arrays
(FPAs). The etch uniformity was measured to be better than 5% over a diameter of 6-in. 相似文献
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ICP技术在化合物半导体器件制备中的应用 总被引:1,自引:0,他引:1
介绍了ICP刻蚀工艺技术原理和在化合物半导体器件制备中的应用,包括ICP刻蚀技术中的低温等离子体的形成机理、等离子体与固体表面的相互作用等,并对影响ICP刻蚀结果的因素进行了分析.研究了不同的工艺气体配比、腔体工作压力、ICP源功率和射频源功率对刻蚀的影响,并初步得到了一种稳定、刻蚀表面清洁光滑、图形轮廓良好、均匀性较好和刻蚀速率较高的干法刻蚀工艺. 相似文献
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P. Lamarre C. Fulk D. D’Orsogna E. Bellotti F. Smith P. LoVecchio M. B. Reine T. Parodos J. Marciniec S. P. Tobin J. Markunas 《Journal of Electronic Materials》2009,38(8):1746-1754
Dislocations are known to influence the electrical and optical properties of long-wavelength infrared (LWIR) HgCdTe detectors
and have been shown to limit the performance of arrays fabricated on heteroepitaxial substrates. To help better understand
dislocations in HgCdTe, a new method for preparing HgCdTe diagnostic epitaxial single-crystal samples by chemically removing
the supporting CdZnTe substrate has been developed. Using this new sample preparation technique, the behavior of misfit and
threading dislocations in HgCdTe epitaxial layers has been investigated by using a defect etch to reveal the dislocations
present in the thin HgCdTe films. In most cases etch pits on the surface of the film are spatially correlated with etch pits
on the bottom of the HgCdTe film. The small displacements of the related etch pits were used to obtain crystallographic information
concerning the paths followed by threading dislocations on allowed slip planes in the HgCdTe crystal. In addition, transmission
electron microscopy (TEM) is used to obtain more specific information regarding the Burgers vector of the dislocation. While
this new sample preparation technique is useful for studying dislocations in HgCdTe epitaxial layers, it can also be used
to study stress from ohmic contacts and passivation layers. The technique can be used for both liquid-phase epitaxy (LPE)-
and molecular-beam epitaxy (MBE)-grown HgCdTe on CdZnTe substrates. 相似文献