The Electronic Materials and Devices Laboratory (EMDL) is comprised of students and senior researchers with diverse backgrounds across the disciplines of Electrical Engineering, Physics, Materials Science, Chemistry, and Chemical Engineering. Such breadth allows vertical integration of research in electronic materials, nanostructures, optoelectronics, photovoltaics, electronics, device fabrication and integrated systems. The interdisciplinary philosophy of research within EMDL grants a unique perspective and results in extensive collaboration with other groups, at OSU and beyond.


The Electronic Materials and Devices Laboratory (EMDL) at Ohio State is located in the Department of Electrical Engineering and is directed by Professor Steven A. Ringel. For more information about activities and opportunities, please contact the EMDL Executive Assistant, Ms. Jennifer Donovan, at

Recent Publications

  • Z. Zhang, D. Cardwell, A. Sasikumar, E. C. H. Kyle, J. Chen, E. X. Zhang, D. M. Fleetwood, R. D. Schrimpf, J. S. Speck, A. R. Arehart and S. A. Ringel, "Correlation of proton irradiation induced threshold voltage shifts to deep level traps in AlGaN/GaN heterostructures", J. Appl. Phys. 119, 165704, 2016.


  • J. Grassman, D. J. Chmielewski, S. D. Carnevale, J. A. Carlin and S. A. Ringel, "GaAs0.75P0.25/Si Dual-Junction Solar Cells Grown by MBE and MOCVD", IEEE J. Photovolt., vol. 6(1), pp. 326-331, 2016.


  • E. García-Tabarés, J. A. Carlin, T. J. Grassman, D. Martín, I. Rey-Stolle and S. A. Ringel, "Evolution of silicon bulk lifetime during III–V-on-Si multijunction solar cell epitaxial growth", Prog. Photovoltaics, DOI: 10.1002/pip.2703, 2016.


  • Z. Zhang, E. Farzana, A. R. Arehart, and S. A. Ringel, "Deep level defects throughout the bandgap of (010) b-Ga2O3 detected by optically and thermally stimulated defect spectroscopy", Appl. Phys. Lett., vol 108(5), pp. 052105, 2016.


  • X. Liu, C. M. Jackson, F. Wu, B. Mazumder, R. Yeluri, J. Kim, S. Keller, A. R. Arehart, S. A. Ringel, J. S. Speck, and U. K. Mishra, "Electrical and structural characterizations of crystallized Al2O3/GaN interfaces formed by in situ metalorganic chemical vapor deposition," J. Appl. Phys., vol 119, pp. 015303, JAN 7, 2016.


  • A. Sasikumar, A. R. Arehart, D. W. Cardwell, C. M. Jackson, W. Sun, Z. Zhang, S. A. Ringel, “Deep trap-induced dynamic on-resistance degradation in GaN-on-Si power MISHEMTs,” Microelectronics Reliability, vol. 56, pp. 37-44, JAN, 2016.


  • A.R. Arehart, A. Sasikumar, G.D. Via, B. Poling, E.R. Heller, S.A. Ringel, "Evidence for causality between GaN RF HEMT degradation and the Ec-0.57 eV trap in GaN," Microelectronics Reliability, vol. 56, pp.45-48, JAN, 2016.


Kevin Galiano and Julia Deitz win the 2017 OSU Materials Week Student Poster Award

Congratulations Kevin Galiano and Julia Deitz! Both won the 2017 OSU Materials Week Student Poster Award. Read More

Esmat’s paper Highlighted in APL

Esmat’s paper, "Influence of metal choice on (010) β-Ga2O3 Schottky diode properties" was highlighted on Applied Physics Letters homepage as an Editor’s Pick in the week of May 21, 2017. The paper represents an in-depth analysis of metal Schottky contact characteristics on β-Ga2O3, transport mechanisms operative in the contacts and, correlation of work function and barrier height with different metal choices. The insights derived will play an important role in gate metal engineering and its functionality for future high power application devices. Read More

Prof. Tyler Grassman Wins SunShot Award to Develop High Efficiency Tandem Solar Cell

Prof. Tyler Grassman (MSE/ECE) was awarded $1,124,999 to develop a tandem solar cell with gallium arsenide phosphide (GaAsP) on silicon (Si) aimed at 30% or higher efficiency. Read More

Daniel Chmielewski Wins Best Student Paper Award at the 43rd IEEE PVSC

Congratulations to Daniel Chmielewski! Daniel won the best student paper award at the 43rd IEEE Photovoltaics Specialist Conference for his presentation "Comparative Study of 2.05 eV AlGaInP and Metamorphic GaInP Materials and Solar Cells Grown by MBE and MOCVD."

Kevin Galiano Wins 2016 OSU Materials Week Student Poster Award

Congratulations Kevin Galiano! Kevin won the 2016 OSU Materials Week Student Poster Award for his project "Spatial Localization of Electron Traps in GaN." Read More

Daniel Chmielewski Wins 2016 Kraus Memorial Poster Competition

Congratulations to Daniel Chmielewski! Daniel won the 2016 Kruas Memorial Poster Competition for his project "III-V/Active-Si Integration for Low-Cost High-Performance Concentrator Photovoltaics". As a reward, he was given the opportunity to present his work at the 2016 OSU ECE Alumni meetup event held at the Engineers' Club of Dayton. Read More

Zeng Zhang awarded MRS 2015 Electronic Materials Conference Best Student Paper Award

Congratulations to Zeng Zhang! Zeng earned the 2015 MRS Electronic Materils Conference Best Student Paper Award for his presentation: "Deep Level States in p-Type GaN Grown by Ammonia-Based Molecular Beam Epitaxy and Metal Organic Chemical Vapor Deposition".

Prof. Steve Ringel Named 2015 OSU Distinguished Scholar

Steve Ringel Receives Distinguished Scholar Award

Professor Steve Ringel was named a 2015 OSU Distinguished Scholar honoring his commitment to research work in wide bandgap semiconductors and photovoltaics and to leadership as Executive Director of the OSU Institute for Materials Research (IMR) and as the Principal Investigator of the Materials and Manufacturing for Sustainability Discovery Theme Initiative. Read more