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Modulated Photoconductivity of High-Purity and Carbon-Doped β-Rhombohedral Boron

Abstract Frequency-modulated photoconductivity spectra of high-purity and up to 1.1 at.% carbon-doped β -rhombohedral boron were measured between about 96 and 380 K to get information on electronic transport with small relaxation times. At T T >170 K the interband recombination is fast enough to become appreciable in the dark phase of the modulation, and the interband photoconductivity becomes prevailing. The interband transition energies known from absorption measurements are confirmed. The thermal activation energy of the electron mobility is about 14 meV, probably due to a shallow level off the conduction band.