Title: Solid Solutions of Grimm–Sommerfeld Analogous Nitride Semiconductors II-IV-N2 (II=Mg, Mn, Zn; IV=Si, Ge): Ammonothermal Synthesis and DFT Calculations
Authors: Mallmann, Mathias
Niklaus, Robin
Rackl, Tobias
Benz, Maximilian
Chau, Than G.
Johrendt, Dirk
Minár, Jan
Schnick, Wolfgang
Citation: MALLMANN, M., NIKLAUS, R., RACKL, T., BENZ, M., CHAU, T. G., JOHRENDT, D., MINÁR, J., SCHNICK, W. Solid Solutions of Grimm–Sommerfeld Analogous Nitride Semiconductors II-IV-N2 (II=Mg, Mn, Zn; IV=Si, Ge): Ammonothermal Synthesis and DFT Calculations. Chemistry-A european journal, 2019, roč. 25, č. 69, s. 15887-15895. ISSN 0947-6539.
Issue Date: 2019
Publisher: Wiiley
Document type: článek
URI: 2-s2.0-85076326033
ISSN: 0947-6539
Keywords in different language: ammonothermal synthesis;density functional calculations;nitrides;semiconductors;solid solutions
Abstract in different language: Grimm-Sommerfeld analogous II-IV-N-2 nitrides such as ZnSiN2, ZnGeN2, and MgGeN2 are promising semiconductor materials for substitution of commonly used (Al,Ga,In)N. Herein, the ammonothermal synthesis of solid solutions of II-IV-N-2 compounds (II=Mg, Mn, Zn; IV=Si, Ge) having the general formula ((II1-xIIxb)-I-a)-IV-N-2 with x approximate to 0.5 and ab initio DFT calculations of their electronic and optical properties are presented. The ammonothermal reactions were conducted in custom-built, high-temperature, high-pressure autoclaves by using the corresponding elements as starting materials. NaNH2 and KNH2 act as ammonobasic mineralizers that increase the solubility of the reactants in supercritical ammonia. Temperatures between 870 and 1070 K and pressures up to 200 MPa were chosen as reaction conditions. All solid solutions crystallize in wurtzite-type superstructures with space group Pna2(1) (no. 33), confirmed by powder XRD. The chemical compositions were analyzed by energy-dispersive X-ray spectroscopy. Diffuse reflectance spectroscopy was used for estimation of optical bandgaps of all compounds, which ranged from 2.6 to 3.5 eV (Ge compounds) and from 3.6 to 4.4 eV (Si compounds), and thus demonstrated bandgap tunability between the respective boundary phases. Experimental findings were corroborated by DFT calculations of the electronic structure of pseudorelaxed mixed-occupancy structures by using the KKR+CPA approach.
Rights: © Wiley
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