A5040772630- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Machine Learning in Materials Science
- Inorganic Chemistry and Materials
- Crystallography and molecular interactions
- GaN-based semiconductor devices and materials
- Chalcogenide Semiconductor Thin Films
- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- 2D Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Metal and Thin Film Mechanics
- MXene and MAX Phase Materials
- Advanced Thermoelectric Materials and Devices
- Semiconductor materials and interfaces
- ZnO doping and properties
- Semiconductor materials and devices
- Advanced ceramic materials synthesis
- Advanced X-ray and CT Imaging
- CCD and CMOS Imaging Sensors
- Diamond and Carbon-based Materials Research
- Phase-change materials and chalcogenides
- Advanced Condensed Matter Physics
- Drilling and Well Engineering
- Electronic and Structural Properties of Oxides
Great Lakes Institute of Management
2022
Michigan State University
2020-2021
Fraunhofer USA
2020
Kyma Technologies (United States)
2020
Case Western Reserve University
2013-2017
John Carroll University
2007-2008
We investigate lattice ordering phenomena for the heterovalent ternaries that are based on wurtzite lattice, under constraint octet rule be preserved. show that, with single exception of a highly symmetric twinned structure, all allowed orderings can described by pseudospin model corresponding to two different stackings $ABAB$ rows atoms in basal plane occur $Pna{2}_{1}$ and $Pmc{2}_{1}$ crystal structures. First-principles calculations difference energies formation between these structures...
The role of exchange defects on the band structure ${\mathrm{ZnGeN}}_{2}$ is investigated. Exchange are defined through cations Zn and Ge starting from ideal $Pna{2}_{1}$ crystal structure, which obeys local octet rule. Each such creates several nitrogen-centered tetrahedra violate rule, although overall charge neutrality preserved. We study distributions defects, some with all antisites making up defect close to each other increasing numbers others where two types...
A series of experiments was carried out to explore the conditions under which ZnSnN 2 would form by vapor–liquid–solid synthesis from a Zn–Sn melt exposed nitrogen plasma. precipitated at temperatures between 455 and 560 °C for compositions 1.5 15 at.% Zn. Sn 3 N 4 formed 440 below 1 Zn apparently grew only in vapor phase, 409 463 °C. Each materials identified its characteristic Raman spectrum Auger chemical analysis. The composition profiles melts were modeled as function time using...
Characterizing the crystalline disorder properties of heterovalent ternary semiconductors continues to challenge solid-state theory. Here, a Landau theory is developed for wurtzite-based semiconductor ZnSnN2. It shown that symmetry two nearly co-stable phases, with space groups Pmc21 and Pbn21, imply reconstructive phase transition source crystal structure via mixture domains. The site exchange defect, which consists adjacent antisite defects, identified as nucleation mechanism transition. A...
Single crystals of Sb2Te3 doped with Cr (cCr=0–6×1020 cm−3) were prepared by the Bridgman method. The measurements Hall coefficient reveal a nonmonotonous dependence hole concentrations on content in crystal. concentration decreases at low Cr, while higher it increases again. However, according to magnetic measurements, atoms enter structure and form uncharged substitutional defects CrSb×, which cannot affect free carrier directly. observed can be elucidated means point defect model. model...
Heterovalent ternary nitrides are considered one of the promising classes materials for photovoltaics, combining attractive physical properties with low toxicity and element abundance. One front-runner systems under consideration is ZnSnN 2 . Although it nominally a compound, no clear crystallographic evidence cation ordering has been observed so far. An attempt to elucidate this discrepancy [Quayle (2020). Acta Cryst. A 76 , 410–420] was trigger an intensive discussion between authors,...
The authors report on the hydrostatic pressure dependence of magnetotransport properties ferromagnetic Sb2−xVxTe3 single crystals with x=0.02–0.03. Pressure significantly increases free hole concentration in these compounds. In turn, Curie temperature is suppressed by roughly 40%, which goes against many models that would predict an increase increasing carrier concentration. These results indicate ferromagnetism materials mediated and a full Ruderman-Kittel-Kasuya-Yosida model takes into...
Two-dimensional MoS2 is a crystalline semiconductor with high potential for numerous technologies. Research in recent years has sought to exploit the direct band gap and carrier mobility properties of monolayer functional applications. To date, production remained at research level samples are usually synthesized small quantities using yield, expensive techniques. In order realize scalable MoS2-based technology, large-area, high-quality affordable wafers must become available. Here we report...