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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
01 Feb 2013 | Online Presentations | Contributor(s): Muhammad Alam
Outline:Strain in materials/origin of defectsExamples: bulk defectsExamples: interface defectsMeasurementsConclusions
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
Solar Cells Lecture 5: Organic Photovoltaics
29 Aug 2011 | Online Presentations | Contributor(s): Muhammad A. Alam
Organic solar cells make use of low-cost organic polymers forphotovoltaics. Although these solar cells may appear to be quitedifferent from solar cells made with conventional, inorganicsemiconductors (e.g. they make use of exciton generation rather than electron-hole generation) this...
Solar Cells Lecture 4: What is Different about Thin-Film Solar Cells?
Thin film solar cells promise acceptable efficiency at low cost. This tutorial examines the device physics of thin-film solar cells, which generally require a different type of analysis than crystalline solar cells.
Optimum Morphology and Performance Gains of Organic Solar Cells
09 Sep 2011 | Online Presentations | Contributor(s): Biswajit ray, Muhammad Alam
Morphology of light absorbing layer is known to dictate the power conversion efficiency of organic photovoltaic (OPV) cell. The innovation of bulk heterojunction (BHJ) led to significant improvement for exciton harvesting, but carrier recombination at the distributed interfaces and variability...
A Physical Model for Non-Ohmic Shunt Conduction and Metastability in Amorphous Silicon Solar Cells
16 Aug 2011 | Online Presentations | Contributor(s): Sourabh Dongaonkar, Souvik Mahapatra, Karthik Yogendra, Muhammad Alam
In this talk we develop a coherent physics based understanding of the shunt leakage problem in a-Si:H cells, and discuss its implications on cell and module level.Sourabh Dongaonkar is with School of Electrical and Computer Engineering, Purdue University, West Lafayette, INKarthik Y and Souvik...
Essential Aspects of Negative Bias Temperature Instability (NBTI)
01 May 2011 | Online Presentations | Contributor(s): Ahmad Ehteshamul Islam, Souvik Mahapatra, Muhammad Alam
We develop a comprehensive theoretical framework for explaining the key and characteristic experimental signatures of NBTI. The framework is based on an uncorrelated dynamics of interface-defect creation/annihilation described by Reaction-Diffusion (R-D) theory and hole trapping/detrapping...
OPV: Untangling the Essence of Bulk Heterostructure Organic Solar Cells: Why the Complex Need not be Complicated
31 Jan 2011 | Online Presentations | Contributor(s): Muhammad Alam
This presentation was part of the "Organic Photovoltaics: Experiment and Theory" workshop at the 2010 Users' Meeting of the Molecular Foundry and the National Center for Electron Microscopy, both DOE-funded Research Centers at Lawrence Berkeley National Laboratory.
On the Resolution of Ultra-fast NBTI Measurements and Reaction-Diffusion Theory
30 Dec 2009 | Online Presentations | Contributor(s): Ahmad Ehteshamul Islam, Souvik Mahapatra, Muhammad A. Alam
Reaction-Diffusion (R-D) theory, well-known to successfully explain most features of NBTI stress, is perceived to fail in explaining NBTI recovery. Several efforts have been made to understand differences between NBTI relaxation measured using ultra-fast methods and that predicted by R-D theory....
Lecture 10: Interface Damage & Negative Bias Temperature Instability
02 Feb 2010 | Online Presentations | Contributor(s): Muhammad A. Alam
Outline:Background informationNBTI interpreted by R-D modelThe act of measurement and observed quantityNBTI vs. Light-induced DegradationPossibility of Degradation-free TransistorsConclusions
Lecture 9: Breakdown in Thick Dielectrics
05 Apr 2010 | Online Presentations | Contributor(s): Muhammad A. Alam
Outline:Breakdown in gas dielectric and Paschen’s lawSpatial and temporal dynamics during breakdownBreakdown in bulk oxides: puzzleTheory of pre-existing defects: Thin oxidesTheory of pre-existing defects: thick oxidesConclusions
Lecture 8: Mechanics of Defect Generation and Gate Dielectric Breakdown
10 Mar 2010 | Online Presentations | Contributor(s): Muhammad A. Alam
Lecture 7: On Reliability and Randomness in Electronic Devices
14 Apr 2010 | Online Presentations | Contributor(s): Muhammad A. Alam
Outline:Background informationPrinciples of reliability physicsClassification of Electronic ReliabilityStructure Defects in Electronic MaterialsConclusions
Lecture 6: 3D Nets in a 3D World: Bulk Heterostructure Solar Cells
27 Oct 2009 | Online Presentations | Contributor(s): Muhammad A. Alam
Outline:Introduction: definitions and review
Reaction diffusion in fractal volumesCarrier transport in BH solar cellsAll phase transitions are not fractalConclusions
Lecture 5: 2D Nets in a 3D World: Basics of Nanobiosensors and Fractal Antennae
Outline:Background: A different type of transport problem
Example: Classical biosensorsFractal dimension and cantor transformExample: fractal nanobiosensors Conclusions
Appendix: Transparent Electrodes and Antenna