{"title":"Use of multiple lithography monitors in a defect control strategy for high volume manufacturing","authors":"L. Bond, D. Sutton, K. Turnquest","doi":"10.1109/ASMC.1999.798240","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798240","url":null,"abstract":"As I-line and deep ultraviolet (DUV) photolithography processes grow more complex, yield improvement has become more challenging and critical. With the advent of smaller sub-micron geometries using newer chemically amplified photoresists, a high sensitivity, easy to review and trouble-shoot monitor is essential. In order to fully understand what defects may be generated by a process or process tool, it is necessary to fully duplicate the given process on the test wafer used to monitor the defect level. That concept is called: Process Induced Defects Per Wafer Pass (PIDPWP). PIDPWP requires the real and exact product process to be used in creating the defect test monitor. To monitor a photolithography process using the concept of PIDPWP, typically, a coat, expose, and develop sequence is used with a selected and simplified mask, such as a diffraction grating. In a manufacturing area with multiple technologies, each step of the process may require different resist/developer combinations. Each resist/developer combination requires constant monitoring to insure adequately low levels of defects. Our solution to this problem is to use multiple integrated monitors to verify each process. This allows for better response time and defect density control when the defects are due to the chemicals or chemical delivery systems, and not just the mechanical aspects of the tool. In addition, we have designed our system to have minimal impact on production, yet still allow for statistical process control, analysis, and defect reduction. The Photo Track Monitor (PTM) methods and results of this control strategy as applied in a high volume manufacturing environment are discussed.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"14 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113935841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Gallagher, M. Rice, G. Langdeau, L. Lanzerotti, M. Dupuis, R. Johnson, L. Stern, E. Sanchez, C. Chen
{"title":"Effects of in-situ arsenic-doped amorphous silicon emitter process on SiGe heterojunction bipolar transistors","authors":"M. Gallagher, M. Rice, G. Langdeau, L. Lanzerotti, M. Dupuis, R. Johnson, L. Stern, E. Sanchez, C. Chen","doi":"10.1109/ASMC.1999.798264","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798264","url":null,"abstract":"This paper discusses the use of a single wafer process tool to deposit As-doped amorphous silicon emitter films on double polysilicon, self-aligned SiGe heterojunction NPN bipolar transistors. In-situ processing has the advantage of reducing the number and complexity of process steps while being compatible with sub-350 nm emitter technologies. Below 350 nm implanted polysilicon emitters are expected to encounter adverse perimeter effects and the plug effect. We report increased transistor gain with amorphous silicon emitters compared with similarly doped polysilicon emitters caused by a reduction in the base current. We will demonstrate how the base current can be controlled by polysilicon deposition temperature. Also, with in-situ doping, we show how improved uniformity of the As concentration at the base-emitter junction translates into improved across-wafer uniformity for the pinch base sheet resistance.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121147262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Advanced interconnect process development utilizing wafer inspection with \"on-the-fly\" automatic defect classification","authors":"A. Skumanich, J. Boyle, D. Brown","doi":"10.1109/ASMC.1999.798239","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798239","url":null,"abstract":"Wafer inspection providing classified defect density with \"on-the-fly\" automatic defect classification (OTF-ADC) is increasingly being utilized to obtain the detailed defect information for rapid resolution of defectivity issues. The OTF-ADC defect categories allow the critical defect types to be segregated and tracked during the actual wafer inspection without any throughput reduction. Inspection with OTF-ADC can be utilized at various interconnect steps such as post-develop, post-etch, and post-metal-CMP step for advanced process development and line monitoring. Significant benefits are realized with early defect excursion detection by tracking the classified defect counts instead of simply the total defect counts. An associated requirement is the ability to capture all of the relevant defect types at key inspection points. Utilizing the Applied Materials WF736 with a combined bright-field and dark-field architecture, the full range of yield limiting defects was captured at two key interconnect stages: post litho, and post CMP. After-development inspection (ADI) with the WF found both macro (>15 um) and micro (<15 u) defects. In some instances, the micro-defects could only be imaged with a SEM. The OTF-ADC provided good accuracy for both ADI and CMP. Using an example from post metal CMP, OTF-ADC is shown to identify hidden excursions which would have had significant yield impact and which would have gone undetected with standard \"total count\" inspection methods. The use of OTF-ADC provides improved time-to-information and enhances the yield potential by permitting defect sourcing which facilitates corrective action.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115327930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Correlation of ellipsometric volume fraction to polysilicon grain size from transmission electron microscopy","authors":"T. A. Carbone, P. Plourde, E. Karagiannis","doi":"10.1109/ASMC.1999.798265","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798265","url":null,"abstract":"The actual grain size of polysilicon films as obtained by TEM is correlated to an ellipsometric method using volume fraction and effective medium approximation modeling. The deposition temperature of polysilicon thin films was evaluated using volume fraction. It was determined that as the temperature decreased, and the film approaches an amorphous layer, the volume fraction increased. The volume fraction method is also shown to be useful for post implantation and anneal monitoring of polysilicon morphology. The growth of polysilicon films following anneal and also doping and anneal can be monitored very accurately with the volume fraction measurement.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114909789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dual frequency silicon nitride film of low thermal budget for pre-metal dielectric applications in sub-0.25 /spl mu/m devices","authors":"Yuxiang Wang, J. Lee, B. Thakur, J. Huang","doi":"10.1109/ASMC.1999.798303","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798303","url":null,"abstract":"Dual frequency (Bottom Power) nitride films fabricated by Plasma Enhanced Chemical Vapor Deposition (PECVD) process are extensively studied for pre-metal dielectric application. The films share the same advantages as single frequency process in its low hydrogen content due to the process temperature (550/spl deg/C), which is much higher than the conventional PE nitride. The addition of low frequency power considerably improved the film step coverage and conformality. The MF nitride film also demonstrated outstanding film integrity in the pin-hole test. One of the usual concern about PECVD process is plasma induced damage. Our in-house non-contacting monitor result shows very uniform plasma distribution and minimum amount of surface charging on the wafer. All our findings proves that high quality silicon nitride films generated by dual frequency PECVD method provide an low thermal budget solution for Pre-Metal Dielectric applications in Sub-0.25 /spl mu/m technology.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114665174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Total operational efficiency (TOE): the determination of two capacity and cycle time components and their relationship to productivity improvements in a semiconductor manufacturing line","authors":"D. Martin","doi":"10.1109/ASMC.1999.798177","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798177","url":null,"abstract":"Short cycle time manufacturing (SCM) concepts have been developed to help understand and manage the performance of a manufacturing line. SCM assumes that each tool/toolset (and hence the overall line) can be described by a performance curve that relates cycle time to throughput, with cycle time increasing non-linearly as throughput approaches capacity. Productivity improvements are realized by reducing the components of capacity loss, which increases the overall capacity and, thus, shifts the performance curve. To implement SCM, all major components of capacity loss must be defined, including the primary driver for cycle time: idle-no-WIP. In order to achieve this, the analysis must look beyond a strictly tool-centric focus to a system view focus so that the interaction between the tool, operator, work-in-progress, etc., can be included in the components of capacity loss. This paper develops and explains total operational efficiency (TOE), which is a key component of SCM. TOE describes the capacity and cycle time components of a tool/toolset in a self-consistent and hierarchical way that reflect a system level view and where the interaction of the tool, operator, WIP, etc., are taken into account. Once these components and their relationship have been defined, it is then possible to more clearly articulate responsible owners and assess the possibility of improvement. The reality of most semiconductor manufacturing lines is that tool availability is rarely the largest detractor from capacity. Instead, other issues such as the amount of automation, line layout, cycle time requirements, technology mix, etc., become the prime determiners of the effective capacity. In addition, TOE enables meaningful comparisons to be made between different lines and for the better tracking of improvements over time in any given line on a component by component basis.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126941618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Interconnect technology and design implications for future ASIC and system-on-a-chip (SOC) implementations","authors":"R. Gutmann, K. Chan, R. Graves","doi":"10.1109/ASMC.1999.798213","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798213","url":null,"abstract":"Back-end-of-the-line (BEOL) interconnect technology is undergoing a rapid transformation as a result of the projected impact on IC performance at decreasing minimum feature sizes. As a result, design complexity is becoming the gating item in leading edge IC products, leading to increasing design reuse of IC functional building blocks (i.e. macrocells and intellectual property (IP) cores), particularly for advanced application specific ICs (ASICs) and system-on-a-chip (SOC) implementations. Virtual Design Environment (VDE) software developed for complex printed circuit boards will expand to the chip level as SOC implementations (and advanced ASICs) incorporate increasing use of IP cores and increasingly complex wiring designs. IC manufacturing operations will become increasingly involved in providing and licensing IP cores in support of this evolving design methodology.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131924620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W. Tomlinson, V. Samek, B. Shiffler, D. Gudmundsson, J. Merritt, R. Nurani, J. Shanthikumar
{"title":"Cost effective reticle quality management strategies in wafer fabs","authors":"W. Tomlinson, V. Samek, B. Shiffler, D. Gudmundsson, J. Merritt, R. Nurani, J. Shanthikumar","doi":"10.1109/ASMC.1999.798238","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798238","url":null,"abstract":"A statistically based methodology has been developed to plan and/or optimize the use of reticle inspection capacity in the fab. Statistical methods are used to analyze reticle and product data which are combined, in a stochastic model, with financial parameters. The model uses the combined information to calculate the cost of different reticle inspection strategies, allowing both capacity planning and allocation optimization of given inspection capacity. In this paper we present the reticle inspection planning problem, our solution methodology, excerpts of data analysis performed, and an example inspection planning calculation.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130615403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Minimizing the cost of low K dielectric manufacturing implementation","authors":"W. Rowe, J. Braley, D. Frye, M. E. Mills","doi":"10.1109/ASMC.1999.798304","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798304","url":null,"abstract":"The integration of organic low k interconnection dielectric materials into wafer fab manufacturing processes requires changes to the equipment set and the process sequence. The capital investment required for conversion and the impact of the new equipment and materials on the finished wafer cost are a concern to wafer manufacturers. We have modeled the costs of converting 180 nm logic/microprocessor fabs from Al/W/SiO/sub 2/ and Cu/SiO/sub 2/ dual damascene interconnect processes to Al/W/Low-k and Cu/Low-k processes. Equipment was chosen to minimize the capital outlay required for conversion. The output of the models includes equipment capital requirements: changes to staffing and facilities costs, and the cost of finished wafers. Our results indicate that conversion to low k processing should require only modest capital expenditures and effects the finished wafer costs by less that 5%. For example, one case study shows 10% of a fab's capacity could be converted from Al/W/SiO/sub 2/ interconnect technology to Al/W/Low-k by the addition of a wafer apply track. In this case wafers with the Al/W/Low-k interconnection technology are produced in a new fab at a lower cost than those with Al/W/SiO/sub 2/ interconnection technology.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114382006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Segal, T. Ho, B. Hodgkins, P. Mišić, J. Lin, Mohan Yegnashankaran
{"title":"Predicting failing bitmap signatures for memory arrays with critical area analysis","authors":"J. Segal, T. Ho, B. Hodgkins, P. Mišić, J. Lin, Mohan Yegnashankaran","doi":"10.1109/ASMC.1999.798216","DOIUrl":"https://doi.org/10.1109/ASMC.1999.798216","url":null,"abstract":"Using in-line defect data, critical area analysis of cell layout, and a rule-based algorithm to associate critical areas with electrical faults, we can predict failing bitmap signatures and their frequencies for any memory circuit. The technique is demonstrated using a 0.25 /spl mu/m SRAM technology. Results can be used for test optimization, redundancy planning, yield prediction, and determining process steps responsible for yield loss.","PeriodicalId":424267,"journal":{"name":"10th Annual IEEE/SEMI. Advanced Semiconductor Manufacturing Conference and Workshop. ASMC 99 Proceedings (Cat. No.99CH36295)","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114550623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}