Solid State Electronics and Photonics

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ECE Candidacy Exam Guidelines

SSEP Seminar: Computational studies of ultrawide band gap semiconductors: Ga2O3 and LiGaO2

Title:                 Computational studies of ultrawide band gap semiconductors: Ga2O3 and LiGaO2

Speaker:           Prof. Walter Lambrecht, Department of Physics, Case Western Reserve University

Date:                 Friday November 13, 2020

Time talk:         12 pm (noon) – 1 pm

Gathering:        2 pm – 3 pm

Location:          Zoom

Abstract: Ga2O3 in the beta structure is now widely studied as an ultrawide band gap semiconductor. I will present our results on modeling electron paramagnetic resonance spectra in β-Ga2O3. Two EPR spectra are related to Ga vacancies, one occurs only after optical or X-ray excitation. Calculations of the hyperfine and g-tensors help to identify which signal corresponds to which vacancy structure.  I will also discuss the EPR spectra of Mg and Zn dopants in Ga2O3. Most of the talk, however, will be about introducing two potential new ultrawide gap semiconductors, LiGaO2 and NaGaO2. LiGaO2, has been studied in the past as ceramic and piezoelectric material but we recently showed it should be possible to n-type dope it with Si or Ge. I will present results on the native defects and various dopants in LiGaO2 as well as a study of the EPR parameters of the Li and Ga vacancies, which have already been measured. I will also present GW band structure calculations, showing that LiGaO2 and NaGaO2 both have a wurtzite derived structure with gaps larger than 5.5 eV but have nonetheless interesting differences in  the valence band maximum splitting which result in anisotropic absorption onsets. Finally, I will also discuss alternative structures of these materials, which occur at high pressure.

Biography: Walter Lambrecht did his PhD in Physics at Ghent University in Belgium in 1980. After a visiting professorship in Bahía Blanca, Argentina (1982-84)  and a postdoc at the Max Planck Institute for Solid State Research in Stuttgart (1984-1987), he joined Case Western Reserve University as a researcher and became a faculty member there in 1996. He is a Fellow of the APS (2002) and was awarded the Faculty Distinguished Research Award of CWRU in 2018.  He works on electronic structure of a broad range of materials.

Gathering: We know that it is hard to build your own network and discuss about research with experts around the world during a global pandemic. Hence, we want to give you the possibility to schedule your own coffee break discussion with our guests. Please, reach out to me (fiedler.44@osu.edu) to plan your private session of about 10-15 min. You can use this time to ask more questions or present your work, and hopefully new collaborations can arise from this.

To view the recording, click here: 

https://osu.zoom.us/rec/share/Mqc-mkvCFlwtERe3SHD18gnJNDByftkuP-iCt4lFSXSR7VbuaUweMRWmaG3GBB7P.ARItw0sick-DQft0

62nd Electronic Materials Conference Coming to Ohio State

The Electronic Materials Conference (EMC) is the premier annual forum on the preparation, characterization and use of electronic materials. The 2020 Conference will be held June 24-26 at The Ohio State University, immediately following the Device Research Conference.

EMC will feature a plenary session, parallel topical sessions, a poster session and an industrial exhibition. Mark your calendar today, and plan to attend!

https://www.mrs.org/docs/default-source/meetings-events/mrs-conference-services/2020/emc-2020/emc-2020-call-for-papers.pdf?sfvrsn=39939512_4

78th Device Research Conference coming to Ohio State

For over seven decades, the Device Research Conference (DRC) has brought together leading scientists, researchers and students to share their latest discoveries in device science, technology and modeling. Notably, many of the first public disclosures of key device technologies were made at the DRC. This year marks the 78th anniversary of the DRC—the longest running device research meeting in the world. As we commemorate this meeting, the high-caliber technical sessions will be highlighted by plenary talks and invited talks by international research pioneers and leaders behind modern electronic technology.

The 2020 Conference will be held June 21-24 at The Ohio State University, and will feature:

Informative, timely short courses in rapidly developing fields
Oral and poster presentations on electronic/photonic device experiments and simulations
Plenary and invited presentations given by worldwide leaders
A university setting which encourages open technical discussion of recent advances
A dinner reception followed by a lively evening “rump” session
Strong student participation, including student travel support and Student Paper Awards

The deadline to submit an abstract is March 1, 2020.

For more information, please visit https://www.mrs.org/drc-2020/02-drc-call-for-papers . 

To add an event, email ece-ssep@lists.osu.edu.