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ECE 695A Lecture 13: Introductory Lecture on HCI Degradation
19 Feb 2013 | Online Presentations | Contributor(s): Muhammad Alam
Outline:Background and features of HCI DegradationPhenomenological observationsOrigin of Hot carriersTheory of Si-H Bond DissociationTheory of Si-O Bond DissociationConclusions
ECE 695A Lecture 12R: Review Questions
08 Feb 2013 | Online Presentations | Contributor(s): Muhammad Alam
Review Questions:Explain the difference between local field and global field within an oxide. Explain physically why electric field decreases bond strength.How does the dissociation process becomes non-Arrhenius?Do you think the diffusion and repassivation will also become non-Arrhenius when...
ECE 695A Lecture 12: Field Dependence of NBTI
Outline:Background: Field dependent degradationComponents of field-dependent dissociation:Interpreting experimentsVoltage acceleration factorsConclusion
ECE 695A Lecture 5R: Review Questions
12 Feb 2013 | Online Presentations | Contributor(s): Muhammad Alam
Review Questions:What is the difference between coordination and composition?Is periodicity essential for a defect-free structure?Why can’t the amorphous material have arbitrary ring distribution?How does Temperature enter in Maxwell’s relationship?Do you expect more or less defect for...
ECE 695A Lecture 10A: Appendix - Reflection on R-D Equation
ECE 695A Lecture 11R: Review Questions
Review Questions:Does Einstein relationship hold for activated diffusion?People argue that the forward dissociation and reverse passivation have similar activation barriers. Would you support the argument?What assumption did I make regarding diffusion of H in SiO2 that makes the derivation...
ECE 695A Lecture 9R: Review Questions
Review Questions:Does NBTI power-exponent depend on voltage or temperature?Do you expect the NBTI power-exponent to be larger or smaller if trapping is important?How does one know that the diffusing species is neutral?How would the time-exponent different for a surround gate MOSFET vs. planar...
ECE 695A Lecture 11: Temperature Dependence of NBTI
07 Feb 2013 | Online Presentations | Contributor(s): Muhammad Alam
Outline:Review: Temperature activation & NBTITemperature dependent forward/reverse ratesTemperature dependence of diffusion coefficientMaterial dependence of activation energyConclusion
ECE 695A Lecture 10: NBTI Time Dependence -- Frequency and Duty Cycle Dependencies
06 Feb 2013 | Online Presentations | Contributor(s): Muhammad Alam
Outline:NBTI stress and relaxation by R-D modelFrequency independence and lifetime projectionDuty cycle dependenceThe magic of measurementConclusions
ECE 695A Lecture 9: NBTI Time Dependence -- Stress Phase
Outline:Background: Time-dependent degradationThe Reaction-Diffusion modelApproximate solution to R-D model in stress phaseDegradation free transistorsConclusions
ECE 695A Lecture 8R: Review Questions
01 Feb 2013 | Online Presentations | Contributor(s): Muhammad Alam
What is the distinction between BTI and NBTI phenomena?What does it mean that a process is thermally activated?What is the difference between parametric failure and catastrophic failure? Give examples. What are the time-characteristics of trapping, BTI, and NBTI?Which device will have poorer...
ECE 695A Lecture 8: Phenomenological Observations for NBTI
Outline:Qualitative observationsTime, voltage, temperature dependenciesMaterial dependenceCircuit implications
ECE 695A Lecture 7R: Review Questions
29 Jan 2013 | Online Presentations | Contributor(s): Muhammad Alam
Review Questions:Why are there more types of defects in crystals than in amorphous material?From the perspective of Maxwell’s relation, how does H reduce defect density?Why is HfO2 so defective --- and why do you want to use it?Which type of traps involve faster trapping/detrapping, Pb center or...
ECE 695A Lecture 7A: Appendix - Theory of Stochastic Distribution
Supplemental information for Lecture 7: Trapping in Pre-existing Traps
ECE 695A Lecture 7: Trapping in Pre-existing Traps
Outline:Pre-existing vs. stress-induced trapsVoltage-shift in pre-existing bulk/interface trapsRandom Telegraph Noise, 1/f noiseConclusion
ECE 695A Lecture 6: Defects in the Bulk and at Interfaces
Outline:Strain in materials/origin of defectsExamples: bulk defectsExamples: interface defectsMeasurementsConclusions
ECE 695A Reliability Physics of Nanotransistors
17 Jan 2013 | Courses | Contributor(s): Muhammad Alam
This course will focus on the physics of reliability of small semiconductor devices. In traditional courses on device physics, the students learn how to compute current through a device when a voltage is applied.
ECE 695A Lecture 5: Amorphous Material/Interfaces
Outline:Amorphous vs. crystalline materialsDefect-free amorphous materialOrigin of defects (Maxwell’s relation)Conclusions
ECE 695A Lecture 4: Structures and Defects in Crystals
17 Jan 2013 | Online Presentations | Contributor(s): Muhammad Alam
Outline:Background informationDefect-free crystal structuresDefects in crystalsConclusions
ECE 695A Lecture 3: Reliability as a Threshold Problem
Outline:Reliability as a Threshold Problem: Empirical vs. Physical Models‘Blind Fish in a Waterfall’ as a prototype for Accelerated Testing/Statistical distributionFour elements of Physical ReliabilityConclusions
ECE 695A Lecture 2: A Brief History of Reliability and Types of Reliability Models
16 Jan 2013 | Online Presentations | Contributor(s): Muhammad Alam
Outline:Reliability as a General PhenomenaA Brief History of ReliabilityApproaches to Reliability PhysicsConclusions
ECE 695A Lecture 1: Reliability of Nanoelectronic Devices
11 Jan 2013 | Online Presentations | Contributor(s): Muhammad Alam
Outline:Evolving Landscape of ElectronicsPerformance, Variability, and ReliabilityClassification of ReliabilityCourse InformationConclusions
In Search of a Better MEMS-Switch: An Elementary theory of how nanostructured dielectrics may soften landing, increase travel range, and decrease energy dissipation
06 Jun 2012 | Online Presentations | Contributor(s): Muhammad Alam
In this talk, I will discuss an elementary theory of the role of nanostructured electrodes in addressing some of the challenges from a fundamentally different perspective. The goal is to start a conversation regarding the viability of the approaches suggested and see if the perspective offered...
Illinois Nano EP Seminar Series Fall 2011: Untangling the Essence of Bulk Heterostructure Organic Solar Cells: Why Complex Need not be Complicated
10 Nov 2011 | Online Presentations | Contributor(s): Muhammad A. Alam
A new class of Macroelectronic devices appropriate for large area flexible electronics, supercapacitors, batteries, and solar cells rely on the biological dictum that 'form defines function' and use structural geometry to compensate for the poor intrinsic transport in materials processed at low...
31 Oct 2011 | Online Presentations | Contributor(s): Muhammad A. Alam