Abstract
Our experimental results indicate the formation of extended ordered S–Ti–Se layers (Janus layers) in the Ti(Se1–xSx)2 system. The presence of these layers is observed as a folding of the typical Fermi surface of TiS2 and TiSe2. High-resolution transmission electron microscopy (HRTEM) allows us to observe these layers by a typical rotation of the moiré fringe images. Analysis of the dependence of the electromotive force of the electrochemical cell on the S:Se ratio, angle-resolved photoelectron spectroscopy, resonant photoelectron spectroscopy, Fermi surface mapping, and HRTEM data allows us to conclude that the structure of the solid solution consists of S–Ti–Se and TiCh2 (Ch = S or Se) Janus layers.
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