Synchrotron radiation studies of transition metal selenide thin-films formation on Ti, Mo and Cu substrates: in and out diffusion of Li

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• 作者：Saltas ; V. ; Papageorgopoulos ; C.A. ; Papageorgopoulos ; D.C. ; Tonti ; D. ; Pettenkofer ; C. ; Jaegermann ; W.
• 关键词：Copper ; Molybdenum ; Selenides ; Titanium
• 刊名：Thin Solid Films
• 出版年：2001
• 出版时间：June 15, 2001
• 年：2001
• 卷：389
• 期：1-2
• 页码：307-314
• 全文大小：182 K

文摘

In this paper we study the formation of transition metal selenide thin-films. The investigation took place in ultra high vacuum (UHV) by means of photoemission spectroscopy with synchrotron radiation. The films were produced by simultaneous co-adsorption of TiCl₄ and elemental Se on polycrystalline Ti, Mo and Cu substrates, at 250°C. The above co-adsorption on Ti produces thin-films of TiSe₂ layer compounds, whereas, on the Mo and Cu substrates, Se interacts directly with the substrate producing a MoSe₂ layer compound and Cu_2–xSe thin-films, respectively. Deposited Li is intercalated into both TiSe₂ and MoSe₂ layer compound thin-films while it interacts with the non-layered Cu_2–xSe producing an alkalimetal copper selenide compound (Li_xCu_ySe_z). When the above Li_xCu_ySe_z and Li-intercalated TiSe₂, MoSe₂ thin films are exposed to TiCl₄ at 140°C, TiCl₄ dissociates, leading to a strong Li⁺–Cl⁻ interaction and the formation of a LiCl overlayer.