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Improving the chemical potential of nitrogen to tune the electron density and mobility of ZnSnN2

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Abstract

To meet device applications, it is essential to fabricate nondegenerate ZnSnN2 with higher mobility. Herein, the chemical potential of nitrogen was improved under Zn-rich sputtering conditions and nondegenerate ZnSnN2 with mobility higher than 20 cm2 V−1 s−1 was successfully fabricated. The properties of the samples were characterized. The obtained ZnSnN2 is wurstite. Band conduction is observed in the range 300–100 K and nearest neighbour hopping is observed in the range 100–70 K. The forbidden band gap is about 1.43 eV and Sn substituting Zn is the major donor, whose ionization energy is 34.6 meV. Improving the chemical potential of nitrogen under Zn-rich conditions effectively changes the off-stoichiometry of ZnSnN2 and unintentionally increases oxygen doping, which finally leads to a decrease in electron density and an increase in mobility.

Graphical abstract: Improving the chemical potential of nitrogen to tune the electron density and mobility of ZnSnN2

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Article information


Submitted
21 Dec 2019
Accepted
28 Feb 2020
First published
29 Feb 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Communication

Improving the chemical potential of nitrogen to tune the electron density and mobility of ZnSnN2

F. Ye, Q. Chen, X. Cai, Y. Xie, X. Ma, K. Vaithinathan, D. Zhang, P. Fan and V. A. L. Roy, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06965H

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