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Title: Exciton photoluminescence and benign defect complex formation in zinc tin nitride

Journal Article · · Materials Horizons
DOI:https://doi.org/10.1039/c8mh00415c· OSTI ID:1476311
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [1];  [2]; ORCiD logo [4];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Colorado School of Mines, Golden, CO (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Applied Energy Programs

Emerging photovoltaic materials need to prove their viability by demonstrating excellent electronic properties. In ternary and multinary semiconductors, disorder and off-stoichiometry often cause defects that limit the potential for high-efficiency solar cells. We report on Zn-rich ZnSnN2 (Zn/(Zn + Sn) = 0.67) photoluminescence, high-resolution X-ray diffraction, and electronic structure calculations based on Monte-Carlo structural models. The mutual compensation of Zn excess and O incorporation affords a desirable reduction of the otherwise degenerate n-type doping, but also leads to a strongly off-stoichiometric and disordered atomic structure. It is therefore remarkable that we observe only near-edge photoluminescence from well-resolved excitons and shallow donors and acceptors. Based on first principles calculations, this result is explained by the mutual passivation of ZnSn and ON defects that renders both electronically benign. The calculated bandgaps range between 1.4 and 1.8 eV, depending on the degree of non-equilibrium disorder. The experimentally determined value of 1.5 eV in post-deposition annealed samples falls within this interval, indicating that further bandgap engineering by disorder control should be feasible via appropriate annealing protocols.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
30302; AC02-76SF00515; AC36-08GO28308
OSTI ID:
1476311
Alternate ID(s):
OSTI ID: 1457484
Report Number(s):
NREL/JA-5J00-71244; MHAOAL
Journal Information:
Materials Horizons, Vol. 5, Issue 5; ISSN 2051-6347
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (3)

Interplay between Composition, Electronic Structure, Disorder, and Doping due to Dual Sublattice Mixing in Nonequilibrium Synthesis of ZnSnN 2 :O journal January 2019
Electron scattering mechanisms in polycrystalline sputtered zinc tin oxynitride thin films journal July 2019
Ternary nitride semiconductors in the rocksalt crystal structure journal July 2019

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