SCI. Scientific Computing International. Scientific Computing International. FilmTek. Raising Thin Film Metrology Performance to a New Level
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1 FilmTek Raising Thin Film Metrology Performance to a New Level 1
2 Through Silicon Via (TSV) Metrology FilmTek TM TM TSV TSV Metrology Advantages Measure high aspect ratio TSV structures (up to 30:1) Measure TSV etch depth up to 500μm Measure TSV structures with diameter down to 1μm TSV diameter μm CD, 1σ < 0.2% Via depth μm Via depth, 1σ < 0.005% Film thickness 10nm-350μm, 1σ < 0.005% 300mm fully automatic measurement (Brooks or SCI automation) Measurement time 1-2 seconds per point FilmTek TM TM 2000M 2000M Critical Dimension, Etch Depth, and Film Thickness of TSV Structures 2
3 FilmTek TM 2000M TSV Metrology Optical Etch Etch Depth Measurement of of High Aspect Ratio TSV TSV Structures R Simulated %R Measured %R 80 air Si % Reflection Wavelength (nm) Interference between reflected waves is caused by optical path length difference between the top and bottom surfaces of the TSV structure The spot size must be small (same order as via diameter) and the measurement beam must be nearly collimated to observe interference in the reflected light Power Spectral Density N T (µm) 3
4 FilmTek TM 2000M TSV Metrology Patented FilmTek TM TM Technology Pinhole Slit Spectrometer Controller Variable aperture controls angular spectrum of the incident light Measurement spot size and angular spread is proportional to the ratio of F 1 and F 2 Small measurement spot size is achieved without the use of a high power objective F 2 CCD Camera Objective Variable Aperture Light Source F 1 Sample 7 XYZ Stage 4
5 FilmTek TM 2000M TSV Case Study Comparison of of Via Via Etch Etch Depth by by FilmTek TM TM 2000M and and SEM Via Diameter (µm) Etch Depth (µm) SEM Etch Depth (μm) FilmTek TM 2000M Target via depth 60 μm Excellent agreement between FilmTek TM 2000M and SEM data 5
6 FilmTek TM 2000M Case Study Critical dimension (CD), etch etch depth, and and residual Si Si thickness measurement Via structure and dimensions for MEMS application Residual silicon thickness Via width 87 μm Via depth 140 μm Residual silicon thickness 10 μm 6
7 FilmTek TM 2000M Metrology FilmTek TM TM 2000M Measurement Sequence Top surface image Critical dimension measurement and fit (Cognex) Acquire measurement location Etch depth analysis Bottom surface image Film thickness measurement and fit (Spectroscopic Reflectometry) 7
8 FilmTek TM 2000M TSV Metrology Fully automated TSV measurements provided to SEMI standard SECS/GEM interface Etch Depth Critical Dimension (CD) Film Thickness Y (mm) Critical Critical Dimension (μm) (μm) X (mm) No. of Obs. (%); N = 52 Average = Median = Std. Dev = 1.12 Uniformity = 2.69% Minimum = % = Maximum = % = Etch Etch Depth Depth (μm) (μm) Silicon Silicon Thickness (μm) (μm) Y (mm) Y (mm) X (mm) No of Obs (%) X (mm) No of Obs (%) Average = Median = Std. Dev = 3.35 Q. Range = 4.71 Minimum = % = Maximum = % = Average = Median = Std. Dev = 3.23 Q. Range = 4.60 Minimum = % = 7.71 Maximum = % =
9 FilmTek TM 2000M TSV Case Study Comparison of of FilmTek TM TM 2000M, SEM, and and Zygo Measurements Sample SEM FilmTek TM 2000M Difference Wafer ID Reticle Si thickness Etch depth CD Si thickness Etch depth CD Si thickness Etch depth CD #16 #18 R R R R Sample Zygo NV7300 FilmTek TM 2000M Difference Wafer ID Reticle Si thickness Etch depth Si thickness Etch depth Si thickness Etch depth #16 #18 R45 NA NA R61 NA NA 0.33 R45 NA NA R61 NA NA 0.25 Excellent agreement between FilmTek TM 2000M, SEM, and Zygo data 9
10 FilmTek TM 2000M TSV Metrology FilmTek TM TM 2000M TSV Performance Specifications Measurement Functions Wafer Handling Substrate Size Pattern Recognition Critical Dimension (CD), Etch Depth, Film Thickness Brooks or SCI Automation 200/300mm Cognex CD Precision (1 ) < 0.2% Etch Depth Precision (1 ) < 0.005% Film Thickness Range 10nm 350 μm Film Thickness Precision (1 ) < 0.005% Light Source Reflection Wavelength Range Detector Type Wafer Throughput, 9 sites Halogen Lamp nm 3648 pixel silicon CCD array > 60 WPH FilmTek TM 2000M Critical dimension, etch depth, and film thickness for Through Silicon Via (TSV) metrology 10
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