Jpn. J. Appl. Phys. 44 (2005) pp. 4461-4464  |Previous Article| |Next Article|  |Table of Contents|
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Photoacoustic Spectra of Heavily Co-Doped ZnO Powders

Masaki Okamoto, Yoshihiro Inoue, Toshio Kawahara and Jun Morimoto

(Received November 12, 2004; accepted February 6, 2005; published June 24, 2005)

Photoacoustic (PA) spectra were measured for heavily Co-doped ZnO powders using a microphone at room temperature. In PA spectra, the PA signal peaks of Co²⁺ and Co³⁺ can be observed with the ZnO band-gap signals. The two PA peaks related to Co ions show the Co valency change induced by the sintering, and depend on the sintering temperature and the Co concentration. For the heavily Co-doped samples, the Co valency conversion occurred at a low sintering temperature. PA spectroscopy has potential for estimating the inner ion state change during the sintering process.

URL: http://jjap.jsap.jp/link?JJAP/44/4461/
DOI: 10.1143/JJAP.44.4461

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