CMP设备市场及技术现状

综述全球CMP设备市场概况及适应0.18μm工艺平坦化要求的CMP技术现状,给出了向φ300mm圆片转移过程中CMP技术占用成本及CMP设备性能指标.     

CMP加工过程去除率的影响因素研究

CMP的加工过程,是对晶圆表面进行全局平坦化的过程,去除率是整个过程较为关键的指标。影响去除率的有下压力、抛光盘及抛光头的转速、温度、抛光液的种类等,综合考虑这些因素不仅能得到合理的材料去除率,优化平坦化效果,而且还能提高生产效率。     

ULSI制备中铈在SiO2介质CMP抛光中的作用研究

对ULSI制备中铈(Ce)在Si02介质的CMP中的应用及对Ce胶体抛光液的制备进行了较为深入的实验研究,并对提高抛光效果进行了大量实验.     

CMP设备市场及技术现状

综述全球CMP设备市场概况及适应0.18μm工艺平坦化要求的CMP技术现状，给出了向Φ300mm圆片转移过程中CMP技术占用成本及CMP设备性能指标。     

硅晶圆CMP抛光速率影响因素分析

化学机械抛光（CMP）技术是半导体工艺中不可缺少的重要工艺。针对硅晶圆CMP平坦性问题，系统地考察了压力、转速、抛光垫、浆料、温度等因素对硅晶圆平坦化速率的影响，从中找到它们之间的优化参数，减少CMP工艺中的表面划伤、抛光雾、金属离子沾污，清除残余颗粒，保证硅晶圆的平坦化质量。     

硅晶圆CMP抛光速率影响因素分析

化学机械抛光(CMP)技术是半导体工艺中不可缺少的重要工艺。针对硅晶圆CMP平坦性问题,系统地考察了压力、转速、抛光垫、浆料、温度等因素对硅晶圆平坦化速率的影响,从中找到它们之间的优化参数,减少CMP工艺中的表面划伤、抛光雾、金属离子沾污,清除残余颗粒,保证硅晶圆的平坦化质量。     

硅晶圆CMP抛光速率影响因素分析

化学机械抛光(CMP)技术是半导体工艺中不可缺少的重要工艺.针对硅晶圆CMP平坦性问题,系统地考察了压力、转速、抛光垫、浆料、温度等因素对硅晶圆平坦化速率的影响,从中找到它们之间的优化参数,减少CMP工艺中的表面划伤、抛光雾、金属离子沾污,清除残余颗粒,保证硅晶圆的平坦化质量.     

碱性条件下铝CMP的机理分析及实验优化

依据铝的电化学腐蚀特性,阐明了碱性条件下铝化学机械抛光(CMP)的机理。由于铝的硬度较低,在抛光过程中容易产生微划伤等缺陷,因此首先探索出适宜铝化学机械抛光的低压条件(4 psi,1 psi=6.895 kPa)。此外,提出两步抛光的方法,在抛光初期采用压力4 psi,抛光液由质量分数为40%的纳米级硅溶胶与去离子水(DIW)以体积比1∶1配制,氧化剂(H2O2)体积分数为1.5%,FA/O I型表面活性剂体积分数为1%,调节FA/OⅡ型螯合剂pH值为11.0,获得了较高的铝去除速率(341 nm/min)。在抛光后期采用低压1.45 psi,抛光液主要成分为体积分数5%的FA/O表面活性剂,并在较大体积流量(300 mL/min)的条件下进行抛光,充分利用表面活性剂的作用,对实验方案进行优化。采用优化后的实验方案,铝表面的划伤和缺陷显著减少。     

CMP抛光液对TiO2薄膜表面粗糙度的影响

采用自主配制的碱性抛光液对TiO2薄膜进行了化学机械抛光(CMP),研究了在TiO2薄膜CMP加工过程中,碱性抛光液中的SiO2磨料、螯合剂、表面活性剂的体积分数和抛光液pH值对TiO2薄膜表面粗糙度的影响,并进行了参数优化。实验结果表明,在一定的抛光条件下,选用SiO2磨料体积分数为20%、螯合剂体积分数为1.0%、非离子表面活性剂体积分数为5.0%和pH值为9.0的碱性抛光液,抛光后TiO2薄膜表面没有划痕等抛光缺陷,表面粗糙度为0.308 nm,TiO2薄膜去除速率为24 nm/min,在保证抛光速率的同时降低了TiO2薄膜表面粗糙度,满足工业化生产要求。     

影响微晶玻璃CMP速率主要因素的研究

介绍了微晶玻璃及其化学机械抛光工艺,对其抛光机理进行了理论分析,重点对影响抛光速率和抛光质量的工艺参数转速、压力、流速作了详细的研究讨论,定量确定了最佳CMP工艺参数.在抛光液中加入了FA/O Ⅰ型活性剂以保护SiO2胶粒的双电子层结构.通过实验比较了在SiO2磨料碱性抛光液中加入CeO2对抛光速率的影响,得出了适合微晶玻璃晶片抛光的外界条件.在常温条件下工艺参数为转速60r/min、压力0.22 MPa和流速210 mL/min时,能够取得较高的抛光速率和较好的表面质量.     

Endpoint detection for CMP

In spite of dramatic advances in oxide chemical mechanical polishing (CMP) process performance in recent years, there has been relatively little published data on semiconductor production line worthy endpoint detection (EPD) systems for interlevel dielectric (ILD) planarization.¹ In contrast, numerous EPD methods have been successfully developed for metal polishing, most notably friction sensing via motor current monitoring. However, these methods have so far not been proven to be 100% reliable. Semiconductor manufacturers have been searching for a viable method of either monitoring the dielectric removal rate or the planarization of the surface during the polish process, and for improved metal endpoint detection systems. A coustic methods have been patented, but to date no commercially viable acoustic based EPD system exists. A great deal of effort has been expended developing optical methods, and some success has been reported for STI structures. In this paper, we discuss many of the approaches that have been published. We categorize these approaches as being either global or local methods. We further categorize the methods as being either a direct or indirect assessment of events taking place at the surface of the wafer.     

Cu CMP抛光液对速率的影响分析及优化

在超大规模集成电路多层Cu布线CMP工艺中,抛光液是决定抛光速率、抛光表面状态和平坦化能力的重要因素。采用Plackett-Burman(PB)筛选实验对抛光液成分(磨料、氧化剂、活性剂、螯合剂)进行显著性因素分析,得出磨料、FA/O螯合剂Ⅱ型和氧化剂为显著性因素,并采用响应曲面法对其进行优化并建立了模型,最终得到以去除速率为评价条件的综合最优抛光液配比,为Cu抛光液配比优化及对CMP的进一步发展提供了新的思路与途径。     

铝合金CMP技术分析研究

阐明了金属化学机械抛光的机理,同时介绍了铝合金化学机械抛光过程中存在的问题,并提出采用碱性抛光液进行实验;分析了抛光液、压力、温度、pH值参数、FA/OⅠ型活性剂对LY12铝合金圆薄片抛光过程的影响。实验表明,pH值在10.1～10.3、温度控制在25～30℃、压力0.06 MPa下有利于铝合金表面完美化。在抛光后期采用单一表面活性剂溶液并且无压力自重条件下抛光,可以获得更为理想的合金表面。     

Analysis of flow between a wafer and pad during CMP processes

In this paper, we summarize the development of a numerical model for the chemical mechanical planarization (CMP) process and experimentally investigate the effects of pad conditioning on slurry transport and mixing. A simplified two-dimensional numerical model of slurry flow beneath a stationary wafer was developed to determine the pressure and shear stress beneath a wafer. The initial results indicate that in the hydrodynamic regime a positive upward pressure is exerted on the wafer. We also examined three cases to study pad effects on slurry transport; polishing with an Embossed Politex pad, an unconditioned IC1000 pad, and a conditioned IC1000 pad. Cab-O-Sperse SC1 slurry was used in a 1:1.5 dilution with water. Mixing data show that conditioning has a negligible effect on the rate of slurry entrainment and mixing; however, conditioning has a large effect on the thickness of the slurry layer between the wafer and pad. Conditioning was found to increase the slurry thickness by a factor of two. In addition the gradients in slurry age beneath the wafer were compared among the three cases. The IC1000 pads supported a gradient in the inner third of the wafer only, while the Embossed Politex pad showed a linear gradient across the wafer implying it retains pockets of unmixed slurry in the embossed topography.     

蓝宝石衬底材料CMP去除速率的影响因素

阐述了蓝宝石衬底应用的发展前景及加工中存在的问题,分析了蓝宝石衬底化学机械抛光过程中pH值、压力、温度、流量、抛光布等参数对去除速率的影响。提出了采用小流量快启动的方法迅速提高CMP温度,在化学作用和机械作用相匹配时(即高pH值、大流量或低pH值,小流量)可得到较高去除速率,且前者速率高于后者。实验采用nm级SiO2溶胶为磨料的碱性抛光液,使用强碱KOH作为pH调节剂,并加入了适当的表面活性剂及螯合剂等。工艺参数为压力0.18MPa、温度45℃、转速60r/min,采用Rodel-suba 600抛光布,在保证表面质量的同时得到的最大去除速率为11.35μm/h。     

化学机械抛光制程中铜抛光液平坦化能力的评估

The evaluation methods of planarization capability of copper slurry are investigated.Planarization capability and material removal rate are the most essential properties of slurry.The goal of chemical mechanical polishing(CMP) is to achieve a flat and smooth surface.Planarization capability is the elimination capability of the step height on the copper pattern wafer surface,and reflects the passivation capability of the slurry to a certain extent.Through analyzing the planarization mechanism of the CMP process and experimental results,the planarization capability of the slurry can be evaluated by the following five aspects:pressure sensitivity,temperature sensitivity,static etch rate,planarization efficiency and saturation properties.