超薄W-Si-N 作为铜与硅之间的扩散阻挡层

研究了W-Si-N三元化合物对铜的扩散阻挡特性.在Si(100)衬底上用离子束溅射方法淀积W-Si-N,Cu/W-Si-N薄膜,样品经过高纯氮气保护下的快速热退火,用俄歇电子能谱原子深度分布与X射线衍射以及电流-电压特性测试等方法研究了W-Si-N薄层的热稳定性与对铜的阻挡特性.实验分析表明W-Si-N三元化合物具有较佳的热稳定性,在800℃仍保持非晶态,当W-Si-N薄层的厚度仅为6nm时,仍能有效地阻挡铜扩散.     

电化学电容-电压法表征等离子体掺杂超浅结

采用电化学电容-电压(ECV)法对等离子体掺杂制备的Si超浅p n结进行了电学表征.通过对超浅p n结样品ECV测试和二次离子质谱(SIMS)测试及比较,发现用ECV测试获得的p 层杂质浓度分布及结深与SIMS测试结果具有良好的一致性,但ECV测试下层轻掺杂n型衬底杂质浓度受上层高浓度掺杂影响很大.ECV测试具有良好的可控性与重复性.对不同退火方法等离子体掺杂形成的超浅结样品的ECV系列测试结果表明,ECV能可靠地表征结深达10nm,杂质浓度达1021cm-3量级的Si超浅结样品,其深度分辨率可达纳米量级,它有望在亚65nm节点CMOS器件的超浅结表征中获得应用.     

Ti中间层对超薄Ni膜硅化反应特性的影响

在多种Si衬底上利用离子束溅射淀积超薄Ni膜以及Ni/Ti双层膜,经过快速热退火处理完成薄膜的固相硅化反应,通过四探针法、微区喇曼散射法和俄歇深度分布测试法研究了Ti中间层对Ni硅化反应的影响.实验结果证明Ti中间层抑制了集成电路生产最需要的NiSi相的形成.     

Ni/Pd/Si固相反应及NiSi热稳定性增强研究

研究了Ni/Pd双层薄膜在硅衬底上的硅化物形成过程.结果表明,加入Pd层后,退火形成Ni1-xPdxSi固熔体,该固熔体比NiSi的热稳定性好,使得NiSi向NiSi2的转变温度升高.加入Pd的量越多,NiSi2的成核温度越高,并用经典成核理论解释了该现象.     

TiN覆盖层和Co/Ti/Si三元固相反应改善超薄CoSi_2高温稳定性

本文研究不同金属薄膜结构形成的超薄ＣｏＳｉ２膜的高温稳定性．采用离子束溅射和反应磁控溅射技术制备Ｃｏ／Ｓｉ、ＴｉＮ／Ｃｏ／Ｓｉ、Ｃｏ／Ｔｉ／Ｓｉ、ＴｉＮ／Ｃｏ／Ｔｉ／Ｓｉ不同结构，在高纯氮气下进行快速热退火（ＲＴＡ），形成ＣｏＳｉ２薄膜．应用四探针薄层电阻测试、扫描电子显微镜（ＳＥＭ）、透射电子显微镜（ＴＥＭ）进行测试．实验结果表明：ＴｉＮ覆盖层和Ｃｏ／Ｔｉ／Ｓｉ三元固相反应都是有利于形成具有良好高温稳定特性的ＣｏＳｉ２薄膜的有效方法，有望应用于深亚微米接触和互连技术中．     

掺Pt对Si(100)上形成的NiSi薄膜应力的影响

利用在线应力测试技术表征了掺入Pt后对镍硅化物薄膜应力性质的影响.通过改变NiSi薄膜中Pt含量以及控制热处理的升温、降温速率实时测量了薄膜应力,发现在Si(100)衬底上生长的纯NiSi薄膜和纯PtSi薄膜的室温应力主要是热应力,且分别为775MPa和1.31GPa,而对于Ni1-xPtxSi合金硅化物薄膜,室温应力则随着Pt含量的增加而逐渐增大.应力随温度变化曲线的分析表明,Ni1-xPtxSi合金硅化物薄膜的应力驰豫温度随Pt含量的增加,从440℃(纯NiSi薄膜)升高到620℃(纯PtSi薄膜).应力驰豫温度的变化影响了最终室温时的应力值.     

Capacitance-voltage characterization of fully silicided gated MOS capacitor

This paper investigates the capacitance-voltage （C-V） measurement on fully silicided （FUSI） gated metal-oxide-semiconductor （MOS） capacitors and the applicability of MOS capacitor models. When the oxide leakage current of an MOS capacitor is large, two-element parallel or series model cannot be used to obtain its real C-V characteristic. A three-element model simultaneously consisting of parallel conductance and series resistance or a four-element model with further consideration of a series inductance should be used. We employed the threeelement and the four-element models with the help of two-frequency technique to measure the Ni FUSI gated MOS capacitors. The results indicate that the capacitance of the MOS capacitors extracted by the three-element model still shows some frequency dispersion, while that extracted by the four-element model is close to the real capacitance, showing little frequency dispersion. The obtained capacitance can be used to calculate the dielectric thickness with quantum effect correction by NCSU C-V program. We also investigated the influence of MOS capacitor＇s area on the measurement accuracy. The results indicate that the decrease of capacitor area can reduce the dissipation factor and improve the measurement accuracy. As a result, the frequency dispersion of the measured capacitance is significantly reduced, and real C-V characteristic can be obtained directly by the series model. In addition, this paper investigates the quasi-static C-V measurement and the photonic high-frequency C-V measurement on Ni FUSI metal gated MOS capacitor with a thin leaky oxide. The results indicate that the large tunneling current through the gate oxide significantly perturbs the accurate measurement of the displacement current, which is essential for the quasi-static C-V measurement. On the other hand, the photonic high-frequency C-V measurement can bypass the leakage problem, and get reliable low-frequency C-V characteristic, which can be used to evaluate whether the full silicidation ha     

超薄W-Si-N作为铜与硅之间的扩散阻挡层

研究了W- Si- N三元化合物对铜的扩散阻挡特性.在Si ( 10 0 )衬底上用离子束溅射方法淀积W- Si- N ,Cu/W- Si- N薄膜,样品经过高纯氮气保护下的快速热退火,用俄歇电子能谱原子深度分布与X射线衍射以及电流-电压特性测试等方法研究了W- Si- N薄层的热稳定性与对铜的阻挡特性.实验分析表明W- Si- N三元化合物具有较佳的热稳定性,在80 0℃仍保持非晶态,当W- Si- N薄层的厚度仅为6nm时,仍能有效地阻挡铜扩散     

Co/C/Si(100)结构固相外延生长CoSi2

采用Co/C/Si多层薄膜结构的中间层诱导固相外延方法在Si(100)上制备外延CoSi2薄膜.用四探针电阻仪、XRD、AES、RBS等分析手段对该结构固相反应形成的薄膜的电学特性、组分、晶体结构等进行了表征.结果表明,Co/C/Si多层结构经快速热退火,可以在Si(100)衬底上得到导电性能和高温稳定性良好的CoSi2薄膜.C层的加入阻碍了Co和Si的互扩散和互反应,从而促进了CoSi2在硅衬底上的外延.