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Title: Calculated electron paramagnetic resonance g-tensor and hyperfine parameters for zinc vacancy and N related defects in ZnO

Journal Article · · Physical Review Materials

Various defects in ZnO, focused on substitutional NO and N2 in various sites, O-site, interstitial and Zn-site are studied using first-principles calculations with the goal of understanding the electron paramagnetic resonance (EPR) center reported for N2 in ZnO and substitutional N on the O-site. The g tensors are calculated using the gauge including projector augmented wave (GIPAW) method and compared with experiments. The g-tensor of the free $$N^{+}_{2}$$ and $$N^{–}_{2}$$ radicals and their various contributions within the GIPAW theory are analyzed first to provide a baseline reference for the accuracy of the method and for understanding the N2 behavior in ZnO. Previous controversies on the site location of N2 in ZnO for this EPR center and on the shallow or deep nature and donor or acceptor nature of this center are resolved. Here, we find that the N2 on the Zn site is mostly zinc-vacancy like in its spin density and g-tensor, while for the O-site, a model with the N2 axis lying in-the basal plane and the singly occupied πg-orbital along the c axis provides good agreement with experiment. For the interstitial location, if the N2 is not strongly interacting with the surroundings, no levels in the gap are found and hence also no possible EPR center. The calculated g-tensors for NO and VZn are also found to be in good agreement with experiment. The effects of different functionals affecting the localization of the spin density are shown to affect the g-tensor values.

Research Organization:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Council of Thailand (NRCT)
Grant/Contract Number:
SC0008933; NRCT5-RGJ63002-028; 153/2564
OSTI ID:
1903222
Journal Information:
Physical Review Materials, Vol. 6, Issue 10; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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