Identification of shallow Al donors in Al-doped ZnO nanocrystals: EPR and ENDOR spectroscopy

Serguei B. Orlinskii, Jan Schmidt, Pavel G. Baranov, Volker Lorrmann, Ingo Riedel, Daniel Rauh, and Vladimir Dyakonov

Phys. Rev. B 77, 115334 – Published 18 March 2008

Abstract

Electron paramagnetic resonance and electron-nuclear double resonance (ENDOR) experiments on ZnO nanoparticles doped with Al reveal the presence of shallow, effective-masslike donors related to substitutional Al atoms. The shallow character of the Al donor is evidenced by the multitude of ENDOR transitions of the ${}^{67}Z n$ nuclear spins and by the hyperfine interaction of 1.45 MHz of the ${}^{27}A l$ nuclear spin, which is much smaller than for atomic aluminum. The electric-field gradients at the Al and Zn atoms are found to be nearly the same, which supports the contention that the Al atom is located at a Zn position.

Received 9 August 2007

DOI:https://doi.org/10.1103/PhysRevB.77.115334

Authors & Affiliations

Serguei B. Orlinskii^* and Jan Schmidt

Department of Physics, Huygens Laboratory, Leiden University, P.O. Box 9505, 2300 RA Leiden, The Netherlands

Pavel G. Baranov^†

A. F. Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russia

Volker Lorrmann and Ingo Riedel

Functional Materials for Energy Technology, Bavarian Centre for Applied Energy Research (ZAE Bayern), Am Hubland, 97074 Würzburg, Germany

Daniel Rauh and Vladimir Dyakonov^‡

Experimental Physics VI, Faculty of Physics and Astronomy, University of Würzburg, Am Hubland, 97074 Würzburg, Germany

^*Also at Federal Center of Shared Facilities of Kazan State University, 42008 Kazan, Russia.
^†pavel.baranov@mail.ioffe.ru
^‡Also at Bavarian Centre for Applied Energy Research (ZAEBayern), Am Hubland, 97074 Würzburg, Germany; dyakonov@physik.uni-wuerzburg.de

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Issue

Vol. 77, Iss. 11 — 15 March 2008

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