Blue-green emission from epitaxial yet cation-disordered ZnGeN2-xOx

Melamed, Celeste; Tellekamp, Marshall B.; Mangum, John S.; Perkins, John D.; Dippo, Patricia C.; Toberer, Eric; Tamboli, Adele C.

doi:10.1103/PhysRevMaterials.3.051602

Title: Blue-green emission from epitaxial yet cation-disordered ${ZnGeN}_{2 - x} O_{x}$

Abstract

ZnGeN₂ offers a low-cost alternative to InGaN with the potential for band-gap tuning to span the green gap using cation site ordering. The addition of oxygen on the anion site creates an additional degree of electronic tunability. Here, we investigate the structure and optoelectronic properties of an epitaxial ZnGeN_2-xO_x thin film library grown by combinatorial co-sputtering on c-Al₂O₃. Samples exhibit x-ray diffraction patterns and x-ray pole figures characteristic of a wurtzite (cation-disordered) structure with the expected sixfold in-plane symmetry. Transmission electron microscopy reveals a semicoherent interface with periodic dislocations that relieve strain from the large lattice mismatch and also confirms the in-plane and out-of-plane crystallographic orientation. Room-temperature photoluminescence exhibits peaks between 2.4 and 2.8 eV which are consistent with a sharp absorption onset observed by UV-vis spectroscopy. These results demonstrate low-cost synthesis of optically active yet cation disordered ZnGeN_2-xO_x, indicating a path toward application as a blue-green emitter.

Authors:

Melamed, Celeste ^[1]; Tellekamp, Marshall B. ^[2]; Mangum, John S. ^[3]; Perkins, John D. ^[2]; Dippo, Patricia C. ^[2]; Toberer, Eric ^[1]; Tamboli, Adele C. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States)

Publication Date:: Fri May 17 00:00:00 EDT 2019

Research Org.:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1525768

Alternate Identifier(s):: OSTI ID: 1513314

Report Number(s):: NREL/JA-5K00-72835
Journal ID: ISSN 2475-9953; PRMHAR

Grant/Contract Number:: AC36-08GO28308

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Materials

Additional Journal Information:: Journal Volume: 3; Journal Issue: 5; Journal ID: ISSN 2475-9953

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; optoelectronics; disordered systems; semiconductor compounds; wide band gap systems; epitaxy; photoluminescence; sputtering

Citation Formats


                    Melamed, Celeste, Tellekamp, Marshall B., Mangum, John S., Perkins, John D., Dippo, Patricia C., Toberer, Eric, and Tamboli, Adele C. Blue-green emission from epitaxial yet cation-disordered ZnGeN2-xOx.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevMaterials.3.051602.

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                    Melamed, Celeste, Tellekamp, Marshall B., Mangum, John S., Perkins, John D., Dippo, Patricia C., Toberer, Eric, & Tamboli, Adele C. Blue-green emission from epitaxial yet cation-disordered ZnGeN2-xOx.  United States.  https://doi.org/10.1103/PhysRevMaterials.3.051602

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                    Melamed, Celeste, Tellekamp, Marshall B., Mangum, John S., Perkins, John D., Dippo, Patricia C., Toberer, Eric, and Tamboli, Adele C. Fri .  
"Blue-green emission from epitaxial yet cation-disordered ZnGeN2-xOx".  United States.  https://doi.org/10.1103/PhysRevMaterials.3.051602.  https://www.osti.gov/servlets/purl/1525768.

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@article{osti_1525768,

  title        = {Blue-green emission from epitaxial yet cation-disordered ZnGeN2-xOx},

  author       = {Melamed, Celeste and Tellekamp, Marshall B. and Mangum, John S. and Perkins, John D. and Dippo, Patricia C. and Toberer, Eric and Tamboli, Adele C.},

  abstractNote = {ZnGeN2 offers a low-cost alternative to InGaN with the potential for band-gap tuning to span the green gap using cation site ordering. The addition of oxygen on the anion site creates an additional degree of electronic tunability. Here, we investigate the structure and optoelectronic properties of an epitaxial ZnGeN2-xOx thin film library grown by combinatorial co-sputtering on c-Al2O3. Samples exhibit x-ray diffraction patterns and x-ray pole figures characteristic of a wurtzite (cation-disordered) structure with the expected sixfold in-plane symmetry. Transmission electron microscopy reveals a semicoherent interface with periodic dislocations that relieve strain from the large lattice mismatch and also confirms the in-plane and out-of-plane crystallographic orientation. Room-temperature photoluminescence exhibits peaks between 2.4 and 2.8 eV which are consistent with a sharp absorption onset observed by UV-vis spectroscopy. These results demonstrate low-cost synthesis of optically active yet cation disordered ZnGeN2-xOx, indicating a path toward application as a blue-green emitter.},

  doi          = {10.1103/PhysRevMaterials.3.051602},

  journal      = {Physical Review Materials},

  number       = 5,

  volume       = 3,

  place        = {United States},

  year         = {Fri May 17 00:00:00 EDT 2019},

  month        = {Fri May 17 00:00:00 EDT 2019}

}

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https://doi.org/10.1103/PhysRevMaterials.3.051602

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Works referenced in this record:

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Title: Blue-green emission from epitaxial yet cation-disordered ZnGeN 2 - x O x

Abstract

Citation Formats

Mesoporous zinc germanium oxynitride for CO 2 photoreduction under visible light journal, January 2012

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Title: Blue-green emission from epitaxial yet cation-disordered ${ZnGeN}_{2 - x} O_{x}$

Mesoporous zinc germanium oxynitride for CO ₂ photoreduction under visible light
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Modification of (Zn ₁₊ _x Ge)(N ₂ O _x ) Solid Solution as a Visible Light Driven Photocatalyst for Overall Water Splitting
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A review of focused ion beam milling techniques for TEM specimen preparation
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Native point defects and doping in ${ZnGeN}_{2}$
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