Absorption Spectrum of ZnO Precipitates in ZnSe |
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Authors: | N. K. Morozova V. G. Plotnichenko E. M. Gavrishchuk V. V. Blinov |
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Affiliation: | (1) Moscow Power Engineering Institute (Technical University), Krasnokazarmennaya ul. 14, Moscow, 111250, Russia;(2) Fiber Optics Research Center, Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 117756, Russia;(3) Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, ul. Tropinina 49, Nizhni Novgorod, 603950, Russia |
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Abstract: | The absorption spectrum of ZnO precipitates in ZnSe saturated with oxygen is studied in the spectral range 500–2000 cm–1 and is shown to correlate with the transmission spectrum of single-crystal ZnO. Saturation of ZnSe with oxygen in the course of growth leads to ZnO precipitation during cooling. The precipitates give rise to narrow absorption bands in the range 5.8–7.1 m, which correlate with the components of the multiphonon absorption spectrum of ZnO, formed by combinations of LO and TO phonons. The 2LO mode defines the long-wavelength transmission edge of ZnO. In addition, the spectrum shows strong absorptions due to the LO + TO(10.2 m) and 2TO (11.3 and 12.7 m) modes. The possible role of SeO2 is discussed. It is suggested that ZnO with a high carrier concentration may act as a gray filter in the spectral range 2–9 m. |
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