兆声清洗法和离心喷射清洗法的比较

用基于改进的RCA清洗液结合兆声清洗法和离心喷射法清洗抛光的硅片,干燥后用激光扫描法测试抛光硅片表面颗粒.结果表明,改进的RCA清洗液结合兆声的清洗方法对于去除硅片表面的微小颗粒具有更高的效率.     

兆声清洗法和离心喷射清洗法的比较

用基于改进的RCA清洗液结合兆声清洗法和离心喷射法清洗抛光的硅片，干燥后用激光扫描法测试抛光硅片表面颗粒．结果表明，改进的RCA清洗液结合兆声的清洗方法对于去除硅片表面的微小颗粒具有更高的效率．     

硅片清洗研究进展

综述了清洗液的组成、特点、清洗机理、对硅片表面质量的影响以及清洗技术和理论的发展;着重指出了,改进的RCAI对颗粒度、微粗糙度和金属沾污作用的机理,讨论了它与清洗顺序的关系,极度稀释的RCA2能使金属沾污降至10∧10原子/cm∧2以下,且不易使颗粒重新沉淀;最后介绍了清洗工艺的最新进展。     

金刚石膜电化学清洗硅片表面有机沾污的研究

采用金刚石膜电极的电化学方式在专用水基清洗剂中不断产生强氧化剂过氧焦磷酸根离子(P2O4-8),并将此方式作为金刚石膜电化学清洗工艺步骤的第一步,用于氧化去除硅片表面的有机沾污.通过与RCA清洗进行对比实验,并应用X射线光电子谱和原子力显微镜进行清洗效果的检测,结果表明,本清洗工艺处理后的硅片表面有机碳含量更少,微粗糙度小,明显优于现有的RCA清洗工艺.     

金刚石膜电化学清洗硅片表面有机沾污的研究

采用金刚石膜电极的电化学方式在专用水基清洗剂中不断产生强氧化剂过氧焦磷酸根离子(P2O4-8),并将此方式作为金刚石膜电化学清洗工艺步骤的第一步,用于氧化去除硅片表面的有机沾污.通过与RCA清洗进行对比实验,并应用X射线光电子谱和原子力显微镜进行清洗效果的检测,结果表明,本清洗工艺处理后的硅片表面有机碳含量更少,微粗糙度小,明显优于现有的RCA清洗工艺.     

硅片清洗原理与方法综述

对硅片清洗的基本理论、常用工艺方法和技术进行了详细的论述 ,同时对一些常用的清洗方案进行了浅析 ,并对硅片清洗的重要性和发展前景作了简单论述。     

光伏太阳能硅片清洗工艺的探索

对两种不同清洗方法的工作原理、清洗效果和适用范围等特点进行了分析。不同的工艺应采用不同的清洗方法才能获得最佳效果。介绍了硅片清洗机的清洗工艺和腐蚀工艺。指出了硅片清洗工艺的发展趋势。     

干冰微粒喷射清洗技术

简要介绍了随着工艺节点的缩小,传统RCA清洗方法在硅片清洗工艺中的局限性和弊端,进而提出了以CO2为介质的新型干冰微粒喷射清洗方法。从CO2的物理特性出发,论述了CO2流经喷枪后形成干冰微粒的机理,并简要分析了干冰微粒喷射技术对颗粒污染物和有机污染物的清洗机理。在此基础上,介绍了自主研发的一台基于干冰微粒喷射技术的半导体清洗设备,对该设备的结构和各部分的作用作了简要介绍,论述了使用该设备对硅片进行清洗的工艺流程。通过对比实验发现,采用压强为8 MPa、纯度为5N的CO2作为气源,喷嘴前压强设置为11 MPa,使用该设备可以达到很好的清洗效果。     

电化学清洗在太阳能电池制绒前的应用

在太阳能电池制造工业中,为解决硅片制绒前的传统表面处理存在的药剂消耗多以及硅片去除量大的问题,引入电化学清洗的方法。这种方法是利用专用试剂电解后的强氧化性质,通过腐蚀、氧化与清洗的结合,有效清洗硅片表面有机物,且硅片去除量小。从实验中可以看出,去除量减少了1/2。通过应用金刚石膜电极,可高效生产专用试剂电解液。通过XPS显示,电化学清洗能够有效去除有机物污染。对比了电化学清洗与RCA清洗后硅片制绒的效果,证明电化学清洗的制绒效果良好。使用后的电解液经过电极处理后,仍能有效重复使用,说明电化学清洗可有力地控制排放,是大型工业生产中有效去除有机物的方法。     

全自动太阳能硅片清洗机的研制

全自动太阳能硅片清洗机是对脱胶预清洗之后的硅片进行进一步的清洗。为了保证得到洁净的硅片,除了采用碱溶液清洗之外,清洗设备还增加了浸泡、超声清洗、抛动、鼓泡等清洗工艺,提高了硅片的清洗质量和可靠性,保证了硅片的清洗合格率。采用先进的自动控制系统,不仅能满足客户的现有工艺要求,还可以根据用户的需求进行不同的工艺配置。     

硅片湿法清洗工艺技术及设备发展趋势

简要介绍了硅片湿化学清洗工艺技术及清洗设备结构技术,包括一些典型的槽体结构、干燥工艺技术等.并就清洗技术的发展需要,阐述未来清洗设备的发展趋势.     

清洗后硅片表面的电子结构

介绍了一种含表面活性剂和螯合剂的新型半导体清洗剂和清洗工艺。利用红外吸收谱、X射线光电子谱和原子力显微镜等 ,把它和标准 RCA清洗工艺的清洗效果做了比较。测试结果表明 ,经清洗过的硅片表面主要是由硅、氧和碳三种元素组成 ,它们分别以 Si-O键、C-O键和 Si-C键的形式存在。两种清洗技术都在硅片表面产生氧化硅层 ,在硅片表面都存在有机碳污染 ,但新型半导体清洗工艺产生的有机碳污染少于标准 RCA清洗。在对硅片表面的粗糙化影响方面 ,新型半导体清洗技术清洗明显优于标准 RCA清洗技术     

半导体制造中清洗技术的新动向

多年来习惯采用多槽浸渍式RCA清洗的半导体清洗领域里,正在兴起的是从多槽浸渍式向单片式处理转移。并出现了取代RCA法的新型清洗液与新的生产方法。正在开始对超临界流体清洗等下一代清洗技术的开发。概述这些半导体清洗技术的最新动向。     

用含表面活性剂和螯合剂的清洗液清洗硅片的研究

目前半导体工业生产中普遍采用的清洗技术是 RCA清洗技术 .文中介绍了一种含表面活性剂和螯合剂的新型半导体清洗剂和清洗技术 .并利用 X射线光电子谱和原子力显微镜等测试方法 ,分别比较了用两种清洗技术清洗过的硅片表面 .测试结果表明 ,它们的去污效果基本相当 .但对硅片表面的粗糙化影响方面 ,新型半导体清洗技术优于标准 RCA清洗技术 .     

Comparison of experimental and theoretical results on polysilicon emitter bipolar transistors

Two types of polysilicon emitter transistors have been fabricated using identical processing except for the surface treatment prior to polysilicon deposition. The first type was given a dip etch in buffered hydrofluoric acid, which was intended to remove any interfacial oxide, while the second type was given an RCA clean, which was intended to grow an interfacial oxide of known thickness. Detailed electrical measurements have been made on these devices including the temperature dependence of the gain over a wide temperature range. The transistors given an RCA clean have gains approximately five times higher than those given an HF etch. In addition, the temperature dependence of the gain is different for the two types, with the HF devices exhibiting a much stronger dependence at high temperatures than the RCA devices. A detailed comparison is made with the theory and it is shown that the characteristics of the HF devices can largely be explained using a transport theory, while those of the RCA devices can be fully explained using a modified tunneling theory.     

半导体晶圆自动清洗设备

主要介绍了半导体晶圆RCA清洗工艺以及半导体晶圆自动清洗设备在生产中的结构设计和应用情况。在工艺模块和伺服机械传送方面体现了湿法化学的独创性和实用性。解决了晶圆清洗技术中晶圆清洗效果的一致性,在半导体IC、材料、器件领域的清洗工艺中得到广泛使用,具有极大的社会经济效益。     

Influence of dry and wet cleaning on the properties of rapid thermal grown and deposited gate dielectrics

Various silicon surface cleaning processes for rapid thermal in-situ polysilicon/ oxide/silicon stacked gate structures have been evaluated. Metal-oxide-semiconductor capacitors were fabricated to assess the effects of cleaning on the quality of gate oxide structures produced by both rapid thermal oxidation (RTO) and rapid thermal chemical vapor deposition (RTCVD). Excellent electrical properties have been achieved for both RTO and RTCVD gate oxides formed on silicon wafers using either an ultraviole/zone (UV/O₃) treatment or a modified RCA clean. On the contrary, poor electrical properties have been observed for RTO and RTCVD gate oxides formed on silicon wafers using a high temperature bake in Ar, H₂, or high vacuum ambient. It has also been found that the electrical properties of the RTCVD gate oxides exhibit less dependence upon cleaning conditions than those of RTO gate oxides. This work demonstrates that initial surface condition prior to gate oxide formation plays an important role in determining the quality of RTO and RTCVD gate oxides.     

Effective cleaning process and its influence on surface roughness in anodic bonding for semiconductor device packaging

Wafer cleanliness and surface roughness play a paramount role in an anodic bonding process. Impurities and the roughness on the wafer surface result in unbonded areas which lead to fringes and Newton׳s rings. With an augment in surface roughness, lesser area will be in stroke thus making more pressure and voltage to be applied onto the wafers for better bonding. Eventually it became mandatory to choose the best cleaning process for the bonding technology that can substantially reduce the impurities and surface roughness. In this paper, we investigate the bonding of silicon/oxidized silicon on Pyrex (CORNING 7740) glass with respect to surface roughness and cleanliness of the wafers by performing three renowned cleaning processes such as degreasing, piranha, RCA 1& 2 (SC‐Standard Cleaning 1 and 2) and found that RCA compromises the best between the roughness and cleanliness. Studies were also extended to find out the effects of applied voltage and load on the bonded surface. It was observed for samples cleaned with RCA, an increase of 45% in maximum current and decrease of 75% in total bonding time with the applied load and voltage among all the cleaning techniques used. Three dimensional structures for pressure sensor application were successfully bonded by selecting the appropriate load and cleaning process. Atomic force microscopy analysis was done to investigate the surface roughness on silicon/oxidized silicon and Pyrex glass for different cleaning processes. Scanning electron microscopy and optical imaging were performed on the interface for the surface integrity of the bonded samples.     

免清洗型助焊剂的研究进展

根据助焊剂的发展趋势,介绍了免清洗助焊剂的概念、分类及可靠性评价的方法,综述了国内外科研工作者对制备免清洗助焊剂的研究进展状况,并指出了免清洗助焊剂在使用时急需注意的事项,最后阐述了无铅焊料用免清洗型助焊剂是近年来的研究热点.     

洁净煤技术是煤炭工业可持续发展的重要支柱

煤炭未来还将是中国主要能源。洁净煤技术是煤炭工业可持续发展的重要支柱。煤炭工业可持续发展的工程技术体系可考虑以洁净煤技术为核心,通过发展优质煤工程、煤化工工程、高效洁净燃烧与坑口电站工程和洁净矿区工程,并以这4项工程的适当组合形成煤炭综合发展基地。发展洁净煤技术要求转变观念、以相应法律为后盾并制定配套的政策。