Electronic Structures of the Vanadium-Intercalated and Substitutionally Doped Transition-Metal Dichalcogenides Ti x V y Se 2 .

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.