Abstract

The photoconductivity spectra and the carrier drift mobilities of MnO single crystals are measured at various temperatures from 83 to 299 K in the spectral region from 300 to 650 nm by the synchronous detection and transit time methods. The photoconductivity spectra show the photoconductivities associated with the intrinsic inter-band excitations and with the crystal-field adsorptions of Mn2+ ions. The photocarriers are both electrons and holes with high drift mobilities. The results are discussed in terms of recent theories describing the band gaps and the electronic structures of the 3d transition-metal compounds.

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