3,801 technical terms and definitions
sic jfet cascode, sic gate oxide reliability, sic body diode, sic power module assembly
Wide bandgap (WBG) power semiconductors, gallium nitride (GaN) High-Electron-Mobility Transistors (HEMT), and silicon carbide (4H-SiC) power MOSFETs constitute the foundational…
psd, metrology
PSD (Power Spectral Density) analysis is a frequency-domain technique for characterizing surface roughness — decomposing the surface height profile into its spectral components…
power performance area, ppa optimization, design tradeoff, pareto frontier chip design, dvfs
PPA — Power, Performance, Area — is the three-axis scoreboard every chip design decision ultimately gets measured against. Every knob a design team can turn — transistor sizing…
pmd deposition, undoped silicate glass, harp flowable cvd, hsp pmd gapfill, pmd planarization cmp
Pre-Metal Dielectric (PMD) Gap Fill is the deposition and planarization of a low-defect silicon dioxide layer between tungsten contact plugs — typically using undoped silicate…
metrology
Precision, in metrology, measures how tightly repeated measurements of the same feature agree with each other — a question entirely separate from whether those measurements are…
thin film precursor, thin film deposition precursor, semiconductor deposition precursor, precursor selection, precursor properties, precursor decomposition, cvd precursor, ald precursor, deposition chemistry, precursor qualification, cvd
A thin-film precursor is a chemical source molecule that transports one or more film-forming elements to a substrate, where heat, plasma, light, or a coreactant converts it into…
predictive maintenance systems semiconductor manufacturing, predictive maintenance, systems semiconductor manufacturing, mfc ml rf rul, predictive maintenance systems
Predictive Maintenance Systems in Semiconductor Manufacturing Introduction & Motivation Predictive Maintenance (PdM) leverages machine learning and sensor telemetry to forecast…
metrology
Spectroscopic ellipsometry and inline optical wafer metrology constitute the non-destructive physical measurement and defect detection disciplines that govern yield control across…
hardware data prefetcher, cache prefetching algorithms, memory latency hiding, stride prefetcher spatial locality
Hardware Data Prefetching is the hyper-aggressive, predictive architectural hardware mechanism embedded in all modern high-performance microprocessors that actively guesses which…
packaging
Pressure sensor packaging is the specialized packaging design that protects pressure-sensing elements while preserving controlled media access and calibration stability - it…
production, random defects, systematic defects, edge die yield loss, design marginality, wafer mapping, yield trend monitoring, fab health indicator, test economics
Probe yield is the percentage of die on a wafer that pass electrical test at wafer probe — the very first point in manufacturing where a die's actual functional quality gets…
semiconductor process history
A process node designates a semiconductor technology generation, historically tied to minimum feature size but now primarily a marketing designation reflecting transistor density…
drop in cell, ring oscillator speed measurement, wafer level acceptance gating, sample wafer measurement, SPC control chart, earliest process indicator, measurement flow
Process control monitor structures sit in the scribe lines between dies, as well as sometimes in drop-in cells scattered between functional blocks within the die itself, and their…
stress management cmos, film stress engineering, wafer warpage control, residual stress effects
Process-Induced Stress Management — Process-induced mechanical stress in CMOS fabrication arises from thermal mismatch, intrinsic film stress, and phase transformations during…
residual stress cmos, film stress wafer bow, stress-induced overlay error, stress compensation processing
Process-Induced Stress Management is the discipline of controlling, compensating, and exploiting residual mechanical stresses generated during semiconductor fabrication—including…
metrology
Spectroscopic ellipsometry and inline optical wafer metrology constitute the non-destructive physical measurement and defect detection disciplines that govern yield control across…
semiconductor process control, spc, statistical process control, sensor data, fault detection, run-to-run control, process optimization
Semiconductor Manufacturing Process Parameters Monitoring: Mathematical Modeling 1. The Fundamental Challenge Modern semiconductor fabrication involves 500–1000+ sequential…
process node roadmap, semiconductor node, nanometer node, tsmc node, intel node, 3nm 2nm 1nm
Semiconductor Process Nodes are the generational labels used to describe successive advances in chip manufacturing technology, originally representing a physical feature size…
lot to lot variation, wafer to wafer variation, within wafer variation, process sigma
Process Variation is the inevitable deviation of physical dimensions, film thicknesses, doping concentrations, and other parameters from their target values during manufacturing…
lot to lot variation, wafer to wafer variation, within wafer variation, process sigma, pvt variation
Process variation is the unavoidable statistical fluctuation in transistor and interconnect parameters that occurs during semiconductor manufacturing — no two transistors on…
process variation modeling, corner analysis, statistical variation, on chip variation ocv, systematic random variation
Process variation is the unavoidable statistical fluctuation in transistor and interconnect parameters that occurs during semiconductor manufacturing — no two transistors on…
corner analysis pvt, statistical process variation, within die variation, lot to lot wafer wafer variation
Semiconductor Process Variation is the unavoidable manufacturing phenomenon where device and interconnect parameters (threshold voltage, channel length, oxide thickness, metal…
wafer level variation, lot to lot variation, within die variation, systematic random variation
Process Variation in Semiconductor Manufacturing is the inherent variability in every fabrication step — lithography CD, film thickness, doping concentration, etch depth, CMP…
systematic random variation, opc model calibration, advanced process control apc, virtual metrology prediction
Spectroscopic ellipsometry and inline optical wafer metrology constitute the non-destructive physical measurement and defect detection disciplines that govern yield control across…
exposure-defocus, bossung, exposure latitude, cpk, lithography window, semiconductor process window, process capability
A process window is the region of process-parameter space — dose and focus, in lithography's most common case — where a manufacturing step still produces results within…
lithography, depth of focus, exposure latitude, overlapping process window, contour plot, manufacturability margin, CD specification limit, process centering, FEM data
Process window analysis determines the actual range of focus and exposure dose within which patterned features meet their critical-dimension specification — taking raw…
focus exposure matrix qualification, lithography pwq procedure, process window margin verification, pwq defect density mapping
Process window qualification (PWQ) is the experimental and analytical methodology used in advanced semiconductor manufacturing to empirically map, qualify, and monitor…
near data processing chip, pim architecture dram, samsung axdimm, pim programming model
High-bandwidth memory (HBM) is DRAM stacked vertically and connected to its host through an interface thousands of bits wide, running beside the processor on an interposer rather…
metrology
Spectroscopic ellipsometry and inline optical wafer metrology constitute the non-destructive physical measurement and defect detection disciplines that govern yield control across…
pt, laboratory, calibration, round robin, iso 17025, quality, metrology
Proficiency testing is a quality assurance method where laboratories analyze standardized reference samples to verify their testing competence — external organizations provide…
stylus profilometry, optical profilometry, step height measurement, surface profilometer, film step height, stylus scan, cmp dishing profilometry, metrology
Profilometry is the quantitative surface metrology technique used to measure physical step heights, film thickness topography, post-CMP dishing and erosion, and 2D/3D surface…
PLD, user-configurable logic, PAL CPLD FPGA, custom logic without custom chip, reconfigurable chip
A programmable logic device is a chip whose logic function can be configured by the user after manufacture, rather than being fixed when the chip is made, giving designers a way…
projection lithography, photolithography, mask projection, contact printing replacement, wafer exposure
A projection aligner is a photolithography machine that transfers a mask pattern onto a wafer by projecting an image of the mask through a lens system onto the wafer's surface…
contact printing mask damage, catadioptric optics working gap, projection lithography reference diagram
The Working Gap That Ended Mask-Wafer Contact Perkin-Elmer's Micralign (1973) — what the gap looks like, and what it bought in yield and mask life One contact event compounds…
projection lithography, projection lithography 1973
Confront Contact Printing's Mask-Damage Problem The original 1957-era photolithography process pressed the mask directly against the photoresist-coated wafer during exposure…
perkin elmer micralign, projection lithography 1973
Name Defect Generation and Yield Loss From Contact Every contact exposure risked transferring a defect two ways at once: a particle on the wafer could scratch the mask, and a flaw…
catadioptric optics, projection lithography 1973
Introduce Projection (Non-Contact) Alignment as the Fix The fix that defined this generation of lithography was to stop touching the mask to the wafer at all, and instead project…
non contact exposure, projection lithography 1973
Define the Mask-to-Wafer Working Gap Removing physical contact meant introducing a deliberate working gap between the mask and the wafer, with an optical system filling that gap…
mask lifetime, projection lithography 1973
Name Perkin-Elmer and the Micralign System (1973) Perkin-Elmer introduced the Micralign system in 1973 as the production-ready answer to contact printing's defect…
lithography yield, projection lithography 1973
Explain the Reflective (Catadioptric) Optical System Micralign used a catadioptric optical design, combining reflective mirror elements with refractive lens elements rather than…
projection lithography, projection lithography 1973
Explain Why Reflective Optics Avoided Chromatic Aberration Chromatic aberration is the blurring that happens when an optical system focuses different wavelengths of light…
perkin elmer micralign, projection lithography 1973
Detail 1:1 Imaging and the Scanning Slit Micralign projected the mask pattern onto the wafer at 1:1 scale, meaning the image on the wafer was the same size as the pattern on…
catadioptric optics, projection lithography 1973
Quantify Micralign's Throughput Advantage Over Contact Aligners Contact aligners had to handle each wafer carefully to control contact force and avoid damaging either the mask…
non contact exposure, projection lithography 1973
Quantify Mask-Lifetime Extension From Eliminating Contact A contact-printing mask wore out through repeated physical contact, accumulating scratches and embedded particles until…
mask lifetime, projection lithography 1973
Quantify Wafer Defect Reduction and Yield Improvement Removing the contact-driven scratch-and-transfer defect mechanism directly reduced the number of pattern defects printed onto…
lithography yield, projection lithography 1973
Trace Micralign's Adoption Across the Industry Chipmakers evaluating Micralign against their existing contact-printing lines weighed the new system's higher throughput, extended…
projection lithography, projection lithography 1973
Explain Resolution Limits of Projection Scanning Systems Even without the defect problems of contact printing, Micralign's optical system still had a finite resolution limit, set…
perkin elmer micralign, projection lithography 1973
Quantify Alignment Accuracy Gains Over Contact Methods Contact aligners relied on direct mechanical registration between mask and wafer, which was limited by how precisely…
catadioptric optics, projection lithography 1973
Describe Micralign Model Generations and Refinements Perkin-Elmer did not stop at the original 1973 Micralign design, and refined successive models with improvements…
non contact exposure, projection lithography 1973
Quantify the Economic Impact on Cost per Good Die Cost per good die, not cost per wafer exposed, was the metric that actually determined whether switching to projection…