Vibrational spectroscopy of hydrogen donors in zinc oxide
Abstract
Zinc oxide (ZnO) holds great promise as a blue light emitting material, a substrate for blue lasers and LEDs, a transparent conductor, and a transducer material. Recent theoretical and experimental studies have indicated that hydrogen impurities are shallow donors in ZnO. Hydrogen contamination may therefore be responsible for the n-type conductivity of as-grown ZnO. In order to determine the microscopic structure of hydrogen donors, we have performed infrared (IR) spectroscopy on bulk ZnO annealed in hydrogen gas. We observed an O-H bond-stretching mode at 3326.3 cm-1 and a corresponding O-D mode at 2470.3 cm-1. These frequencies are consistent with hydrogen in an antibonding configuration, although the bond-centered configuration cannot be ruled out. In addition to vibrational modes, hydrogen donors in ZnO also give rise to free carrier absorption in the IR spectral region. The thermal stability of these complexes will be discussed.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2003
- Bibcode:
- 2003APS..MARW23003M