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Title: Design of Metastable Tin Titanium Nitride Semiconductor Alloys

Journal Article · · Chemistry of Materials
 [1]; ORCiD logo [2];  [3];  [1];  [4];  [4];  [1];  [1]; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); San Diego State Univ., San Diego, CA (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States); Swiss Federal Labs. for Material Science and Technology, Dubendorf (Switzerland)
  4. Colorado School of Mines, Golden, CO (United States)

Here, we report on design of optoelectronic properties in previously unreported metastable tin titanium nitride alloys with spinel crystal structure. Theoretical calculations predict that Ti alloying in metastable Sn3N4 compound should improve hole effective mass by up to 1 order of magnitude, while other optical bandgaps remains in the 1–2 eV range up to x ~ 0.35 Ti composition. Experimental synthesis of these metastable alloys is predicted to be challenging due to high required nitrogen chemical potential (ΔμN ≥ +1.0 eV) but proven to be possible using combinatorial cosputtering from metal targets in the presence of nitrogen plasma. Characterization experiments confirm that thin films of such (Sn1–xTix)3N4 alloys can be synthesized up to x = 0.45 composition, with suitable optical band gaps (1.5–2.0 eV), moderate electron densities (1017 to 1018 cm–3), and improved photogenerated hole transport (by 5×). Overall, this study shows that it is possible to design the metastable nitride materials with properties suitable for potential use in solar energy conversion applications.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Next Generation of Materials by Design: Incorporating Metastability (CNGMD)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1375624
Report Number(s):
NREL/JA-5K00-66841
Journal Information:
Chemistry of Materials, Vol. 29, Issue 15; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (3)

A map of the inorganic ternary metal nitrides journal June 2019
Synthesis of Lanthanum Tungsten Oxynitride Perovskite Thin Films journal May 2019
A Map of the Inorganic Ternary Metal Nitrides text January 2018

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