Abstract
Non stoichiometric ≈ Cs 3Sb was synthesized at 200°C by a reaction of solid antimony with cesium vapor under controlled pressure. The compositions obtained correspond to atomic ratios 3.04 > Cs Sb > 2.95 . Measurements of the Seebeck coefficient, diffuse reflectance spectra and X-ray studies indicate that the predominant defects are singly charged interstial cesium when Cs Sb > 3 and singly charged interstitial cesium when Cs Sb < 3 ; the band gap is close to 1.35 eV in the whole composition range.
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