What we do

We develop new atomic-to-nanoscale characterization techniques based on scanning transmission electron microscopy (STEM) to investigate the structural origins of a wide range of important properties of materials. We combine the novel STEM techniques, including fluctuation microscopy, electron nano diffraction, and 4D-STEM, with advanced computational simulations to determine the important structure-property relationships beyond the limits of any conventional characterization or simulation methods. Our current research focus includes the investigation of point and extended defects that dictate the electronic and doping properties of wide band gap semiconductors, the structure, chemistry, and morphology of low-dimensional materials and interfaces, and the nanoscale structural heterogeneity that connects to mechanical and electrical properties of disorders materials, including metallic glasses and amorphous thin films.

 

News

  • New MRSEC grant from NSF will support the study of novel metal / magnetic-insulator interfaces. Read more

  • Our summer REU student, Thomas Watts, has presented the SonicAtomic, a digital data analysis interface for people with visual impairment, at the MRS Fall 2019 meeting (see the slides).

  • Our paper, Jared Johnson et al, "Unusual formation of point defect complexes in the ultra-wide band gap semiconductor β-Ga2O3" was publised in Physical Review X. Link and News article

  • Our collaborative project with UW-Madison "Intermediates in Amorphous Oxide Thin Films Grown by Atomic Layer Deposition" was funded by DOE-BES (2019).

  • Jinwoo Hwang receives the Lumley Research Award from OSU College of Engineering (2019). Read more

  • Jinwoo Hwang receives the NSF CAREER Award for his proposal "Novel Debye Waller Thermometry of Oxide Interfaces for Reducing Thermal Interface Resistance" (2019). Read more

  • Electron Microscopy Pixel Array Detector (EMPAD) has been installed in our STEM ! (2019) Read more

  • New collaborative project with Air Force Research Laboratory will focus on the structure and chemistry of interfaces within soft materials (2018). Read more

  • Our Proto-IRG funding from the Center for Emergent Materials at OSU, "Structure, Defects, and Emergent Properties at Magnetic Oxide Interfaces" has been renewed (2018).

  • A new PhD student, Hsien-Lien Huang, has joined our group (2018).

  • A new PhD student, Mehrdad Abbasi, has joined our group (2018).

  • New MURI project (2018): "Gallium Oxide Materials Science and Engineering", led by James Speck at UCSB, has been selected for funding from AFOSR MURI. Press release

  • A new PhD student, Menglin Zhu, has joined our group (2018).

  • New project (2017) : "Structure, Defects, and Emergent Properties at Magnetic Oxide Interfaces", a Proto-IRG grant supported by the Institution of Materials Research and Center for Emergent Materials at OSU. Read more

  • New project (2017) : Our team project, "Novel Methods for the Design and Fabrication of Complex Disordered Solids", has been awarded with funding from the National Science Foundation (NSF-DMREF). Read more

  • New project (2017) : "Ultra Wide Band Gap III-Nitride Semiconductor Materials and Devices", in collaboration with Prof. Siddharth Rajan at OSU, and funded by the Air Force Office of Scientific Research (AFOSR). Read more

  • New project (2017) : “Correlating Structural Heterogeneity to Deformation in Metallic Glasses”, led by Jinwoo Hwang, has been awarded with funding from the National Science Foundation (NSF). Read more

  • Jared and Jinwoo have contributed to the development of remote epitaxy of semiconductor films using graphene, which is published in Nature and featured on the cover of Nature Vol. 544 (2017). Press release

 

Recent Publications

  • Aidan J. Lee, Adam S. Ahmed, Brendan A. McCullian, et al. "Interfacial Rashba effect-induced anisotropy in nonmagnetic-material/ferrimagnetic-insulator bilayers", Physical Review Letters 124, 257202 (2020). 
  • Yang Cheng, Sisheng Yu, Menglin Zhu, Jinwoo Hwang, and Fengyuan Yang, "Electrical switching of tristate antiferromagnetic Neel order in alpha -Fe 2O 3 epitaxial films", Physical Review Letters 124, 027202 (2020). 
  • A F M Anhar Uddin Bhuiyan , Zixuan Feng , Jared M. Johnson , Hsien-Lien Huang , Jith Sarker , Menglin Zhu , Md Rezaul Karim , Baishakhi Mazumder , Jinwoo Hwang , and Hongping Zhao, “Phase transformation in MOCVD growth of (AlxGa1−x)2O3 thin films”, APL Materials 8, 031104 (2020).
  • Nirmal Baishnab, Rajan Khadka, Michelle Paquette, Paul Rulis, Nathan Oyler, Jinwoo Hwang, and Ridwan Sakidja, "Role of generated free radicals in synthesis of amorphous hydrogenated boron carbide from orthocarborane using argon bombardment: A ReaxFF molecular dynamics study", Materials Research Express 6, 12, 126461 (2020).
  • Md Rezaul Karim, Benthara Hewage Dinushi Jayatunga, Menglin Zhu, Rebecca A Lalk, Olivia Licata, Baishakhi Mazumder, Jinwoo Hwang, Kathleen Kash, and Hongping Zhao, "Effects of cation stoichiometry on surface morphology and crystallinity of ZnGeN2 films grown on GaN by metalorganic chemical vapor deposition", AIP Advances 10, 065302 (2020). 
  • Chatterjee et al., "Cumulative impacts of proton irradiation on the self-heating of AlGaN/GaN HEMTs", ACS Appl. Electron. Mater. 2, 4, 980 (2020). Link
  • Micah S. Haseman, Md Rezaul Karim, Daram Ramdin, Brenton A. Noesges, Ella Feinberg, Benthara Hewage Dinushi Jayatunga, Walter R. L. Lambrecht, Menglin Zhu, Jinwoo Hwang, Kathleen Kash, Hongping Zhao, and Leonard J. Brillson, "Deep level defects and cation sublattice disorder in ZnGeN2", Journal of Applied Physics 127, 135703 (2020).
  • Taeseon Lee, Menglin Zhu, Taylor Dittrich, Jinwoo Hwang, Anupam Vivek, and Glenn Daehn, "Microstructural Investigation of the Impact Weld Interface of Pseudo Single Grained Cu and Ag", Metallurgical and Materials Transactions A, 51, 558 (2020).

See the entire list of publication here

CEMAS at OSU

Visit our microscopy center https://cemas.osu.edu/