Articles about 'Mask Registration'
Spring Issue 2016 19 May, 2016
Advanced Overlay: Sampling and Modeling for Optimized Run-to-Run Control
In recent years overlay control schemes have become more complicated in order to meet the ever shrinking margins of advanced technology nodes. As a result, new challenges must be addressed for effective run-to-run overlay control. Two of these challenges are addressed in this study by new advanced analysis techniques: (1) sampling optimization for run-to-run control; and (2) bias-variance tradeoff in modeling. The sampling and modeling solutions proposed are validated by APC simulations to estimate run-to-run performance, lot-to-lot and wafer-to-wafer model term monitoring to estimate stability, and ultimately high volume manufacturing tests to monitor on-product overlay by densely measured overlay data.
Winter Issue 2015 22 January, 2015
Addressing Thin Film Thickness Metrology Challenges of 14nm BEOL Layers
This paper describes a method to effectively monitor the film stack at different metal CMP process steps using a spectroscopic ellipsometer metrology tool. By proper modeling of the Cu dispersion and simulating the underlayer film information underneath the Cu pad, a single measurement recipe was developed which can be used to monitor each process step in the metal CMP process with stable and reliable results.
Summer Issue 2014 27 June, 2014
PRODUCT SPOTLIGHT: 5D Patterning Control Solution
KLA is driving improved patterning by addressing five elements of patterning control ─ the three geometrical dimensions of device structures, time-to-results and overall equipment efficiency. New systems drive performance throughout the fab ─ WaferSightTM PWG patterned wafer geometry measurement system, LMS IPRO6 reticle pattern placement metrology system, and K-T Analyzer® 9.0 advanced data analysis system.
Winter Issue 2014 9 January, 2014
PRODUCT SPOTLIGHT: Broadband Plasma Defect Inspection
Advanced defect detection, metrology, and review systems are utilized by IC manufacturers to ramp new processes, increase yield and ultimately increase profitability. KLA’s unique broadband plasma inspectors offer the most capable technology for discovering all of the yield-critical defect types on leading-edge devices.