Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab

With the rapid adoption of dual-damascene copper (CuDD) processing as semiconductor device features shrink into deep-submicron process, the copper electrochemical plating (ECP) is emerging as one choice for Cu metallization in multilevel interconnects. Copper processing has brought about an increase...

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Main Author:	Abdul Wahab, Yasmin
Format:	Thesis
Language:	English
Published:	2008
Subjects:	Applications of electric power Electronics
Online Access:	https://ir.uitm.edu.my/id/eprint/27660/1/TM_YASMIN%20ABDUL%20WAHAB%20EE%2008_5.pdf
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spelling	my-uitm-ir.276602020-01-24T01:06:31Z Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab 2008 Abdul Wahab, Yasmin Applications of electric power Electronics With the rapid adoption of dual-damascene copper (CuDD) processing as semiconductor device features shrink into deep-submicron process, the copper electrochemical plating (ECP) is emerging as one choice for Cu metallization in multilevel interconnects. Copper processing has brought about an increased need to understand and predict desirable properties of the physical vapor deposition barrier and seed deposition, electroplating, chemical-mechanical polishing (CMP) as well as any thermal treatments that required stabilizing and annealing copper. Instead, defectivity is gaining momentum in Cu integration due to new Cu interconnects schemes and increasingly stringent process control requirements post some serious challenges in modem microelectronics devices. As a result, defectivity has driven a significant rise in process failure rates and has had a strong impact on the back-end-of- line (BEOL) processes. This project investigated the characterization of defects generated by copper electroplating process on He In-Situ and furnace annealed electro-plated copper films on p-type bare silicon wafers. A post ECP He In-Situ anneal processing was carried out over a 60°C to 180°C temperature range, with anneal duration times ranging from 6 seconds to 2 hours and the wafers began to be ramped at over 100°C with less than a minute soak time. For the furnace anneal, the wafers were loaded for almost an hour with less than 200 °C soak temperature. Specifically, impacts originated from the defects such as influences on yield lost are being investigated. This study improved a novel procedure of defect measurement, defect source analysis and static code analysis that was employed to identify the different types of defects generated progressively by post copper barrier seed, electrochemical plating, anneals and chemical mechanical planarization. To characterize the modes of action of defects in such processes, we employed constructive and analytical methods to analyze the interaction between defects from incoming and electroplating process and analyzing with scanning electron microscope (SEM) and covers process parameters perspective. Based on the design of experiments data, a new defect characterization scheme that takes defect generation mechanism and potential source into account has been proposed. The proposed scheme improves to differentiate between plating and CMP induced defects and flaws that were generally categorized as missing copper could have resulted from corrosion or scratches during polishing process from incomplete filling of fine features after plating. The study indicates the potential of right inspection and analysis approach of defects characterization can improve entire process modules and indirectly make CuDD technology production worthy. 2008 Thesis https://ir.uitm.edu.my/id/eprint/27660/ https://ir.uitm.edu.my/id/eprint/27660/1/TM_YASMIN%20ABDUL%20WAHAB%20EE%2008_5.pdf text en public masters Universiti Teknologi MARA Faculty of Electrical Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Applications of electric power Electronics
spellingShingle	Applications of electric power Electronics Abdul Wahab, Yasmin Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab
description	With the rapid adoption of dual-damascene copper (CuDD) processing as semiconductor device features shrink into deep-submicron process, the copper electrochemical plating (ECP) is emerging as one choice for Cu metallization in multilevel interconnects. Copper processing has brought about an increased need to understand and predict desirable properties of the physical vapor deposition barrier and seed deposition, electroplating, chemical-mechanical polishing (CMP) as well as any thermal treatments that required stabilizing and annealing copper. Instead, defectivity is gaining momentum in Cu integration due to new Cu interconnects schemes and increasingly stringent process control requirements post some serious challenges in modem microelectronics devices. As a result, defectivity has driven a significant rise in process failure rates and has had a strong impact on the back-end-of- line (BEOL) processes. This project investigated the characterization of defects generated by copper electroplating process on He In-Situ and furnace annealed electro-plated copper films on p-type bare silicon wafers. A post ECP He In-Situ anneal processing was carried out over a 60°C to 180°C temperature range, with anneal duration times ranging from 6 seconds to 2 hours and the wafers began to be ramped at over 100°C with less than a minute soak time. For the furnace anneal, the wafers were loaded for almost an hour with less than 200 °C soak temperature. Specifically, impacts originated from the defects such as influences on yield lost are being investigated. This study improved a novel procedure of defect measurement, defect source analysis and static code analysis that was employed to identify the different types of defects generated progressively by post copper barrier seed, electrochemical plating, anneals and chemical mechanical planarization. To characterize the modes of action of defects in such processes, we employed constructive and analytical methods to analyze the interaction between defects from incoming and electroplating process and analyzing with scanning electron microscope (SEM) and covers process parameters perspective. Based on the design of experiments data, a new defect characterization scheme that takes defect generation mechanism and potential source into account has been proposed. The proposed scheme improves to differentiate between plating and CMP induced defects and flaws that were generally categorized as missing copper could have resulted from corrosion or scratches during polishing process from incomplete filling of fine features after plating. The study indicates the potential of right inspection and analysis approach of defects characterization can improve entire process modules and indirectly make CuDD technology production worthy.
format	Thesis
qualification_level	Master's degree
author	Abdul Wahab, Yasmin
author_facet	Abdul Wahab, Yasmin
author_sort	Abdul Wahab, Yasmin
title	Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab
title_short	Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab
title_full	Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab
title_fullStr	Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab
title_full_unstemmed	Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab
title_sort	characterization of defects generated by copper electrochemical plating process on silicon wafers / yasmin abdul wahab
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Electrical Engineering
publishDate	2008
url	https://ir.uitm.edu.my/id/eprint/27660/1/TM_YASMIN%20ABDUL%20WAHAB%20EE%2008_5.pdf
_version_	1783733988072882176

Characterization of defects generated by copper electrochemical plating process on silicon wafers / Yasmin Abdul Wahab

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