Electronic Structures of the Vanadium-Intercalated and Substitutionally Doped Transition-Metal Dichalcogenides TiVSe₂

The electronic structures of V-intercalated TiSe₂ and substitutionally doped dichalcogenides Ti_1-VSe₂ 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 VSe₂ and TiSe₂ is observed and a small charge transfer between these fragments is found. Intercalation of the V atoms into TiSe₂ leads to charge transfer from the V atoms to the Ti atoms with the formation of covalent complexes Ti-Se₃-V-Se₃-Ti.