Distinct anisotropy and a high power factor in highly textured TiS₂ceramicsviamechanical exfoliation

Polycrystalline bulk of TiS₂with a remarkable enhancement of the texture degree was obtained by densifying powders refined by a liquid-based mechanical exfoliation process. As compared to the pristine TiS₂, the in-(a-b)-plane mobility in the exfoliation sample increased from 5.9 to 9.8 cm²V^-1s^-1with an almost unaffected carrier concentration, in spite of the increased scattering due to grain boundaries. As a result, a tremendously high power factor of up to 16 µW cm^-1K^-2at 673 K was achieved, which is 60% higher than that of the pristine TiS₂and is the highest for bulk TiS₂at high temperatures.