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09 Oct 2011 | Tools | Contributor(s): Mario Renteria, Elliott Ivan Gurrola, Birkir Snær Sigfússon, Suhas Venkat Baddela, Sourabh Dongaonkar, Xingshu Sun, Muhammad Alam
Two dimensional spice simulation of thin film solar panels, including shunt induced variability, and partial shadow effects.
28 Sep 2011 | Tools | Contributor(s): Biswajit ray, Camila Andrea González Williamson, Mohammad Ryyan Khan, Muhammad Alam
Simulation tool for organic solar cells
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
20 Aug 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...
Solar Cell Fundamentals
19 Aug 2011 | Courses | Contributor(s): Mark Lundstrom, J. L. Gray, Muhammad A. Alam
The modern solar cell was invented at Bell Labs in 1954 and is currently receiving renewed attention as a potential contribution to addressing the world's energy challenge. This set of five tutorials is an introduction to solar cell technology fundamentals. It begins with a broad overview of...
A Physical Model for Non-Ohmic Shunt Conduction and Metastability in Amorphous Silicon Solar Cells
15 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...
28 Mar 2011 | Tools | Contributor(s): Sourabh Dongaonkar, Muhammad Alam
Extract compact model parameters from solar cell data
OPV: Untangling the Essence of Bulk Heterostructure Organic Solar Cells: Why the Complex Need not be Complicated
21 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.
A Blind Fish in a River with a Waterfall
23 Mar 2010 | Tools | Contributor(s): Muhammad Alam, Sajia Sadeque
Prototype for a reliability problem defined as Stochastic Process with a Threshold
On the Resolution of Ultra-fast NBTI Measurements and Reaction-Diffusion Theory
16 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
29 Jul 2009 | 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
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
Lecture 7: On Reliability and Randomness in Electronic Devices
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
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
Lecture 4: Stick Percolation and Nanonet Electronics
Outline:Stick percolation and nanonet transistorsShort channel nanonet transistorsLong channel nanonet transistorsTransistors at high voltagesConclusions
Lecture 3: Electrical Conduction in Percolative Systems
Lecture 2: Threshold, Islands, and Fractals
Lecture 1: Percolation and Reliability of Electronic Devices
Nanostructured Electronic Devices: Percolation and Reliability
29 Jul 2009 | Courses | Contributor(s): Muhammad A. Alam
In this series of lectures introduces a simple theoretical framework for treating randomness and variability in emerging nanostructured electronic devices for wide ranging applications – all within an unified framework of spatial and temporal percolation. The problems considered involve...
2009 NCN@Purdue Summer School: Electronics from the Bottom Up
09 Jul 2009 | Workshops | Contributor(s): Supriyo Datta, Mark Lundstrom, Muhammad A. Alam, Joerg Appenzeller
The school will consist of two lectures in the morning on the Nanostructured Electronic Devices: Percolation and Reliability and an afternoon lecture on Graphene Physics and Devices. A hands on laboratory session will be available in the afternoons.
ECE 606 Lecture 24: Large Signal Response
13 Mar 2009 | Online Presentations | Contributor(s): Muhammad A. Alam