Journal article
Doping the Undopable: Hybrid Molecular Beam Epitaxy Growth, n-Type Doping, and Field-Effect Transistor Using CaSnO3
ACS nano, v 17(17), pp 16912-16922
12 Sep 2023
PMID: 37638732
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The alkaline earth stannates are touted for their wide band gaps and the highest room-temperature electron mobilities among all of the perovskite oxides. CaSnO3 has the highest measured band gap in this family and is thus a particularly promising ultrawide band gap semiconductor. However, discouraging results from previous theoretical studies and failed doping attempts had described this material as "undopable". Here we redeem CaSnO3 using hybrid molecular beam epitaxy, which provides an adsorption-controlled growth for the phase-pure, epitaxial, and stoichiometric CaSnO3 films. By introducing lanthanum (La) as an n-type dopant, we demonstrate the robust and predictable doping of CaSnO3 with free electron concentrations, n(3D), from 3.3 x 10(19) cm(-3) to 1.6 x 10(20) cm(-3). The films exhibit a maximum room-temperature mobility of 42 cm(2) V-1 s(-1 )at n 3D = 3.3 x 10(19) cm(-3). Despite having a comparable radius as the host ion, La expands the lattice parameter. Using density functional calculations, this effect is attributed to the energy gain by lowering the conduction band upon volume expansion. Finally, we exploit robust doping by fabricating CaSnO3-based field-effect transistors. The transistors show promise for CaSnO3's high-voltage capabilities by exhibiting low off-state leakage below 2 x 10(-5) mA/mm at a drain-source voltage of 100 V and on-off ratios exceeding 10(6). This work serves as a starting point for future studies on the semiconducting properties of CaSnO3 and many devices that could benefit from CaSnO3's exceptionally wide band gap.
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Details
- Title
- Doping the Undopable: Hybrid Molecular Beam Epitaxy Growth, n-Type Doping, and Field-Effect Transistor Using CaSnO3
- Creators
- Fengdeng Liu - University of MinnesotaPrafful Golani - Twin Cities OrthopedicsTristan K. Truttmann - University of MinnesotaIgor Evangelista - University of DelawareMichelle A. Smeaton - Cornell UniversityDavid Bugallo - Drexel University, Materials Science and EngineeringJiaxuan Wen - Twin Cities OrthopedicsAnusha Kamath Manjeshwar - University of MinnesotaSteven J. May - Drexel University, Materials Science and EngineeringLena F. Kourkoutis - Cornell UniversityAnderson Janotti - University of DelawareSteven J. Koester - Twin Cities OrthopedicsBharat Jalan - University of Minnesota
- Publication Details
- ACS nano, v 17(17), pp 16912-16922
- Publisher
- Amer Chemical Soc
- Number of pages
- 11
- Grant note
- DMR-2235208 / NSF through the Future of Semiconductor teaming grant (FuSeTG) EERE Solar Energy Technologies Office, DOE / EERE Solar Energy Technologies Office, DOE; United States Department of Energy (DOE) FA9550-19-1-0245; FA9550-21-1-0025; FA9550-21-0460 / Air Force Office of Scientific Research (AFOSR); United States Department of Defense DGE-2139899 / NSF GRFP; National Science Foundation (NSF); NSF - Office of the Director (OD) DMR-2011824 / NSF through the UD-CHARM University of Delaware MRSEC Center 1919839 / DARWIN computing system at the University of Delaware - NSF 101063432 / Marie Curie Actions (MSCA); Marie Curie Actions DMR150099 / Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS) program 101063432 / European Union through the Marie Sklodowska-Curie Actions Postdoctoral Fellowship; European Union (EU) ECCS-2025124 / NSF through the National Nanotechnology Coordinated Infrastructure (NNCI); National Science Foundation (NSF); NSF - Office of the Director (OD)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:001063855400001
- Scopus ID
- 2-s2.0-85171202318
- Other Identifier
- 991021861175004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology