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SUMMARY:MARVEL Distinguished Lecture: "Advancing the state of the art in s
 emiconductor technology through predictive atomistic calculations"
DTSTART:20230620T150000
DTEND:20230620T161500
DTSTAMP:20260406T211525Z
UID:9e522998b6000193257eb4818f1301ed8b79f4a9ade7849b6ee9851e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Emmanouil Kioupakis (University of Michigan)\nhttps://ep
 fl.zoom.us/j/65601188458\nPasscode: 1649\n\nProf. Emmanouil Kioupakis\nUni
 versity of Michigan\n\n\nAdvancing the state of the art in semiconductor t
 echnology through predictive atomistic calculations: from uncovering funda
 mental limitations to discovering new materials\n\nAdvancing the state of 
 the art in modern semiconductor technology requires a fundamental understa
 nding of the microscopic quantum processes that govern the operation of el
 ectronic and optoelectronic devices. For example\, the energy conversion e
 fficiency of solar cells\, light-emitting diodes\, and high-power electron
 ics is determined by quantum processes involving the interactions among el
 ectrons\, excitons\, photons\, and phonons. While many of these processes 
 are direct and can be accurately treated with first-order perturbation the
 ory\, others\, such as optical transitions in indirect-gap materials\, are
  enabled only by the additional momentum provided by phonons\, necessitati
 ng a higher-order treatment that increases computational complexity. An ac
 curate and predictive treatment of these phonon-mediated quantum processes
  is necessary to understand the fundamental energy conversion limits in de
 vices. In parallel\, understanding the inherent connection of the electron
 ic properties of semiconductor materials to their underlying chemistry and
  structure is vital in order to discover and design new semiconductors wit
 h desirable properties.\nIn this talk\, I will present our work on the dev
 elopment and application of first-principles computational methods to unco
 ver fundamental limitations and discover new materials for semiconductor t
 echnology. First\, I will discuss how phonons enable light absorption in t
 echnologically important indirect-gap semiconductors\, such as silicon\, a
 nd how these processes enable the operation of silicon solar cells—the m
 ost successful solar-cell technology to date. I will also address how thes
 e phonon-mediated transitions introduce detrimental optical losses in meta
 ls and doped semiconductors. Additionally\, I will present our methodology
  for studying non-radiative Auger-Meitner recombination in semiconductors
 —an essential non-radiative electron-hole recombination mechanism that l
 imits the quantum efficiency of devices. I will demonstrate the crucial ro
 le of phonons in accurately quantifying the Auger-Meitner loss in silicon 
 solar cells and in nitride light emitters.\nFurthermore\, this talk will a
 lso highlight the application of atomistic calculations to understand defe
 cts and dopants in semiconducting oxides. I will discuss the inherent limi
 tations of current state-of-the-art materials such as diamond\, AlGaN\, an
 d Ga2O3 as ultra-wide-band-gap semiconductors in power-electronic applica
 tions. Instead\, I will present the computational discovery of rutile GeO2
  as a superior alternative ultra-wide-band-gap semiconductor with a perfo
 rmance in power-electronic applications\, as determined by established fig
 ures of merit\, that surpasses all known semiconducting materials.\nOur wo
 rk demonstrates the crucial role of predictive atomistic calculations in u
 nderstanding the quantum processes underlying energy conversion and loss i
 n modern electronic and optoelectronic devices\, and in facilitating the d
 evelopment of new materials with superior properties that advance the stat
 e of the art in semiconductor technology.\n \nAbout the speaker\nEmmanoui
 l (Manos) Kioupakis is an Associate Professor of Materials Science and Eng
 ineering and of Applied Physics\, and the Karl F. and Patricia J. Betz Fa
 mily Faculty Scholar at the University of Michigan. His work focuses on t
 he development and application of first-principles computational methods f
 or the theoretical characterization and computational discovery of novel e
 lectronic materials. He has been awarded the National Science Foundation C
 AREER award\, the Jon R. and Beverly S. Holt Award for Excellence in Teach
 ing\, and the 1938E Award by the College of Engineering of the University 
 of Michigan.\n\n 
LOCATION:MED 2 1124 https://plan.epfl.ch/?room==MED%202%201124 https://epf
 l.zoom.us/j/65601188458?pwd=MVZmZERjOG1QT1pmRXZiaFV6NmF4QT09
STATUS:CONFIRMED
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