ECE 695A Lecture 3: Reliability as a Threshold Problem

17 Jan 2013 | Online Presentations | Contributor(s): Muhammad Alam

Outline: Reliability as a Threshold Problem: Empirical vs. Physical Models ‘Blind Fish in a Waterfall’ as a prototype for Accelerated Testing/Statistical distribution Four elements of Physical Reliability Conclusions

ECE 695A Lecture 4: Structures and Defects in Crystals

17 Jan 2013 | Online Presentations | Contributor(s): Muhammad Alam

Outline: Background information Defect-free crystal structures Defects in crystals Conclusions

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 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 Phenomena A Brief History of Reliability Approaches to Reliability Physics Conclusions

ECE 695A Lecture 1: Reliability of Nanoelectronic Devices

11 Jan 2013 | Online Presentations | Contributor(s): Muhammad Alam

Outline: Evolving Landscape of Electronics Performance, Variability, and Reliability Classification of Reliability Course Information Conclusions

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 is …

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 …

Illinois Nano EP Seminar Series Fall 2011: Untangling the Essence of Bulk Heterostructure Organic Solar Cells: Why Complex Need not be Complicated

31 Oct 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 …

PVpanel Sim

09 Oct 2011 | Tools | Contributor(s): Elliott Ivan Gurrola, Sourabh Dongaonkar, Muhammad Alam

Two dimensional spice simulation of thin film solar panels, including shunt induced variability, and partial shadow effects

OPV Lab

28 Sep 2011 | Tools | Contributor(s): Biswajit ray, Camila Andrea González Williamson, Mohammad Ryyan Khan, Muhammad Alam

Simulation tool for organic 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 of …

Solar Cells Lecture 4: What is Different about Thin-Film Solar Cells?

29 Aug 2011 | Online Presentations | Contributor(s): Muhammad A. Alam

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.

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 for photovoltaics. Although these solar cells may appear to be quite different from solar cells made with conventional, inorganic semiconductors (e.g. they make use of exciton generation rather than electron-hole generation) this …

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 …

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, IN Karthik 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 …

PV Analyzer

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.

Lecture 7: On Reliability and Randomness in Electronic Devices

29 Jul 2009 | Online Presentations | Contributor(s): Muhammad A. Alam

Outline: Background
 information Principles
 of 
reliability
 physics Classification
 of 
Electronic
 Reliability Structure 
Defects
 in
 Electronic
 Materials Conclusions

Lecture 9: Breakdown in Thick Dielectrics

29 Jul 2009 | Online Presentations | Contributor(s): Muhammad A. Alam

Outline: Breakdown in gas dielectric and Paschen’s law Spatial and temporal dynamics during breakdown Breakdown in bulk oxides: puzzle Theory of pre-existing defects: Thin oxides Theory of pre-existing defects: thick oxides Conclusions

Lecture 8: Mechanics of Defect Generation and Gate Dielectric Breakdown

29 Jul 2009 | Online Presentations | Contributor(s): Muhammad A. Alam

Lecture 10: Interface Damage & Negative Bias Temperature Instability

29 Jul 2009 | Online Presentations | Contributor(s): Muhammad A. Alam

Outline: Background information NBTI interpreted by R-D model The act of measurement and observed quantity NBTI vs. Light-induced Degradation Possibility of Degradation-free Transistors Conclusions

Universality of NBTI-Induced Interface Trap Generation and Its Impact on ID Degradation in Strained/ Unstrained PMOS Transistors

23 Dec 2008 | Online Presentations | Contributor(s): Ahmad Ehteshamul Islam, Muhammad A. Alam

Despite extensive use of strained technology, it is still unclear whether NBTI-induced NIT generation in strained transistors is substantially different from that of unstrained ones. Here, we present a comprehensive theory for NIT generation in strained/unstrained transistors and show its …

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 6: 3D Nets in a 3D World: Bulk Heterostructure Solar Cells

29 Jul 2009 | Online Presentations | Contributor(s): Muhammad A. Alam

Outline: Introduction: 

definitions
 and
 review
 Reaction
 diffusion
 in 
fractal 
volumes Carrier
 transport
 in 
BH
 solar 
cells All
 phase
 transitions 
are
 not
 fractal Conclusions