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Diagnosis of a low pressure capacitively coupled argon plasma by using a simple collisional-radiative model 下载免费PDF全文
This paper proposes a simple collisional-radiative model to characterise capacitively coupled argon plasmas driven by conventional radio frequency in combination with optical emission spectroscopy and Langmuir probe measurements. Two major processes are considered in this model, electron-impact excitation and the spontaneous radiative decay. The diffusion loss term, which is found to be important for the two metastable states (4s[3/2]2, 4s'[1/2]0), is also taken into account. Behaviours of representative metastable and radiative states are discussed. Two emission lines (located at 696.5 nm and 750.4 nm) are selected and intensities are measured to obtain populated densities of the corresponding radiative states in the argon plasma. The calculated results agree well with that measured by Langmuir probe, indicating that the current model combined with optical emission spectroscopy is a candidate tool for electron density and temperature measurement in radio frequency capacitively coupled discharges. 相似文献
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Effect of F doping on capacitance-voltage characteristics of SiCOH low-k films metal-insulator-semiconductor 下载免费PDF全文
This paper investigates the capacitance-voltage(C-V) characteristics of F doping SiCOH low dielectric constant films metal-insulator-semiconductor structure.The F doping SiCOH films are deposited by decamethylcyclopentasiloxane(DMCPS) and trifluromethane(CHF3) electron cyclotron resonance plasmas.With the CHF3/DMCPS flow rate ratio from 0 to 0.52,the positive excursion of C-V curves and the increase of flat-band voltage VFB from 6.1 V to 32.2 V are obtained.The excursion of C-V curves and the shift of VFB are related to the change of defects density and type at the Si/SiCOH interface due to the decrease of Si and O concentrations,and the increase of F concentration.At the CHF3/DMCPS flow rate ratio is 0.12,the compensation of F-bonding dangling bond to Si dangling bond leads to a small VFB of 2.0 V. 相似文献
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在射频输入功率为400W,气压为0.8Pa的条件下,使用光强标定的发射光谱方法研究了感应耦合H2/C4F8等离子体中CF, CF2, H和F基团的相对密度随流量比R=H2/(H2+C4F8)的变化情况,而HF基团相对密度的变化由四级质谱仪探测得到。结果表明等离子体活性先随着R的增加而升高,然后随着R的进一步增加而下降。在流量比从0逐渐上升到0.625的过程中,CF和CF2基团的相对密度不断降低。实验中测得的CF基团的相对密度[CF]与理论计算得到的[CF]有很好的一致性说明了电子与CF2基团的碰撞反应是CF基团产生的主要原因。文中还讨论了HF基团。 相似文献
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采用脉冲激光沉积技术在不同气氛和氧分压下,在抛光石英片上生长了一系列(200)面择优取向的Nd∶LuVO4薄膜。利用X射线衍射(XRD)分析了所制备薄膜性能,认为成膜较为适宜的气氛为氧气,且氧分压为20Pa时所得到的薄膜性能较好。利用原子力显微镜(AFM)观察了Nd∶LuVO4薄膜的表面形貌,分析了氧分压的存在对薄膜表面质量的影响。利用卢瑟福背散射(RBS)分析了薄膜的组成,发现薄膜的成分组成与靶材的成分较为一致。利用棱镜耦合法测得了该薄膜中每条模所对应的有效折射率为2.0044和1.7098。 相似文献
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以十甲基环五硅氧烷和甲烷作为反应气体,采用电子回旋共振等离子体化学气相沉积(ECR-CVD)方法制备了k=2.45,485℃下的热稳定性优良的SiCOH低介电常数薄膜.通过薄膜结构的FTIR谱分析,比较了十甲基环五硅氧烷(D5)液态源和不同甲烷流量下制备的薄膜的键结构差异,发现在沉积过程中甲烷含量的增大,一方面有利于D5源环结构的保留,另一方面有利于薄膜中形成高密度的CHn基团.高密度碳氢大分子基团的存在降低了薄膜密度,结合薄膜中形成的本构孔隙、低极化率Si-C键以及-OH键减少的共同作用,导致薄膜介电常数的降低. 相似文献
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利用强度标定的发射光谱法,研究了感应耦合CF4/CH4等离子体中空间基团的相对密度随宏观条件(射频输入功率、气压和流量比)的变化情况.研究表明:在所研究的碳氟/碳氢混合气体放电等离子体中除了具有丰富的CF,CF2,CH,H和F等活性基团外,还同时存在着C2基团,其相对密度随着放电功率的提高而增加;随着气压的上升呈现倒"U"型的变化.C2随流量比R(R=[CH4]/{[CH4]+[CF4]})的变化不是单调的,其相对密度在R=7.5%时存在一个极大值,并随着R进一步增加而减弱,然后趋于一个稳定值.根据各基团相对密度的变化规律,认为等离子体中CF和CH基团的气相反应(CF+CH→C2+HF)是C2基团产生的主要途径,并提出了形成C2的基团碰撞的活化反应模型,据此进行的模拟计算的结果与实验相符. 相似文献
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采用脉冲激光沉积技术在不同气氛和氧分压下, 在抛光石英片上生长了一系列(200)面择优取向的NdLuVO4薄膜. 利用X射线衍射(XRD)分析了所制备薄膜性能, 认为成膜较为适宜的气氛为氧气, 且氧分压为20 Pa时所得到的薄膜性能较好. 利用原子力显微镜(AFM)观察了NdLuVO4薄膜的表面形貌, 分析了氧分压的存在对薄膜表面质量的影响. 利用卢瑟福背散射(RBS)分析了薄膜的组成, 发现薄膜的成分组成与靶材的成分较为一致. 利用棱镜耦合法测得了该薄膜中每条模所对应的有效折射率为2.0044和1.7098. 相似文献
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INVESTIGATION ON THE COMPOSITION AND STRUCTURE OF SILICON NITRIDE FILM PREPARED BY ECR-PECVD 总被引:2,自引:0,他引:2 下载免费PDF全文
In this paper, the effect of temperature on the composition and structure of the Si3N4 thin film is investigated. X-ray diffraction pattern and transmission electron microscope (TEM) analyses show that the Si3N4 film undergoes the transition from amorphous to crystalline phase with increasing deposition temperature. Infra-red qualitative analysis shows that the content of hydrogen decreases with increasing deposition temperature.The stoichiometric of Si3N4 is investigated by X-ray photoelectron spectroscopy or electron spectroscopy for chemical analysis. 相似文献