Quantitative Charge Build-Up Evaluation Technique by Using MOS Capacitors with Charge Collecting Electrodes in Wafer Processing

Hiroki KUBO  Takashi NAMURA  Kenji YONEDA  Hiroshi OHISHI  Yoshihiro TODOKORO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E79-C   No.2   pp.198-205
Publication Date: 1996/02/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microelectronic Test Structures)
Category: Reliability Analysis
Keyword: 
antenna capacitor,  charge build-up,  charge to breakdown,  ion implantation,  

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Summary: 
A novel technique for evaluation of charge build-up in semiconductor wafer processing such as ion implantation, plasma etching and plasma enhanced chemical vapor deposition by using the breakdown of MOS capacitors with charge collecting electrodes (antenna) is proposed. The charge build-up during high beam current ion implantation is successfully evaluated by using this technique. The breakdown sensitivity of a MOS capacitor is improved by using a small area MOS capacitor with a large area antenna electrode. To estimate charge build-up on wafers quantitatively, the best combination of gate oxide thickness, substrate type, MOS capacitor area and antenna ratio should be carefully chosen for individual charge build-up situation. The optimum structured antenna MOS capacitors which relationship between QBD and stressing current density was well characterized give us very simple and quantitative charge build-up evaluation. This technique is very simple and useful to estimate charge build-up as compared with conventional technique by suing EEPROM devices or large area MOS capacitors.