Abstract
Undoped n-type MgZnO films were deposited on c-plane sapphire substrates by molecular-beam epitaxy and subsequently annealed in O2 at different pressures. After annealing at 3.03 × 105 Pa, oxygen content in the annealed films show increases and the films transform into p-type conduction. However, the decreases of oxygen content and the increases of electron concentration were obtained while the films annealed at 1.01 × 105 Pa or 2.05 × 10−3 Pa. The changes in intensity of the emission peak located at 2.270 eV are similar to the changes of the oxygen content in the films annealed at different pressures. According to the defect levels and the relationship between photoluminescence spectra and annealing condition, it was suggested that this emission peak was related to interstitial oxygen (Oi). The obtained p-type conduction is attributed to that the Oi acceptor can compensate oxygen vacancy and interstitial zinc donor.
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Acknowledgement
This work is supported by the Key Project of the National Natural Science Foundation of China under grant no. 50532050; The Knowledge Innovation Program of the Chinese Academy of Sciences (NO.KJCX3.SYW.W01); The National Natural Science Foundation of China (Nos. 60776011, 60806002 and 10874178). The authors would like to thank Dr. H. F Zhao for useful discussions and advice. The authors also would like to acknowledge financial support through Swedish Research Links via VR.
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Liu, W.W., Yao, B., Li, Y.F. et al. Oxygen partial pressure dependence of the properties of MgZnO thin films during annealing. J Mater Sci 45, 6206–6211 (2010). https://doi.org/10.1007/s10853-010-4714-y
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DOI: https://doi.org/10.1007/s10853-010-4714-y