Comparison of the electronic structures of Zn1-xCoxO and Zn1-xMgxO nanorods using x-ray absorption and scanning photoelectron microscopies

J. W. Chiou, H. M. Tsai, C. W. Pao, K. P. Krishna Kumar, S. C. Ray, F. Z. Chien, W. F. Pong, M. H. Tsai, C. H. Chen, H. J. Lin, J. J. Wu, M. H. Yang, S. C. Liu, H. H. Chiang, C. W. Chen

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Abstract

X-ray absorption near-edge structure (XANES) and scanning photoelectron microscopy (SPEM) measurements have been performed for Zn1-xCo xO and Zn1-xMgxO to elucidate the effects of the doping of Co and Mg, which have very different electronegativities, on the electronic structures of ZnO nanorods. The intensities of O K-edge near-edge features in the XANES spectra of Zn1-xCoxO and Zn 1-xMgxO nanorods are found to be lower than those of ZnO, which suggests that both Co and Mg substitutions of the Zn ions enhance the effective charge on the O ion. The valence-band SPEM measurements show that Mg doping does not increase the density of near-Fermi-level states, which implies that Mg doping will not improve field emission of ZnO nanorods. It is surprising to find that both Co and Mg substitutions of Zn increase the numbers of O 2p dominated valence-band states, despite that Co and Mg have larger and smaller electronegativities than that of Zn.

Original languageEnglish
Article number043121
JournalApplied Physics Letters
Volume89
Issue number4
DOIs
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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