Electronic Structures of the Vanadium-Intercalated and Substitutionally Doped Transition-Metal Dichalcogenides TixVySe2

The electronic structures of V-intercalated TiSe 2 and substitutionally doped dichalcogenides Ti 1– x V x Se 2 have been studied using soft X-ray photoelectron, resonant photoelectron, and absorption spectroscopies. In the case of the substitution of Ti by V, the formation of coherently oriented structural fragments VSe 2 and TiSe 2 is observed and a small charge transfer between these fragments is found. Intercalation of the V atoms into TiSe 2 leads to charge transfer from the V atoms to the Ti atoms with the formation of covalent complexes Ti–Se 3 –V–Se 3 –Ti.