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Lithium Intercalation in InSe

The intercalation of lithium in InSe has been extensively studied. Indium monoselenide is a layered semiconductor in which each layer consists of four close-packed, covalently bounded, monoatomic sheets in the sequence Se-In-ln-Se. When material is grown by the Bridgman method, the 3R polytype (y-InSe) crystallizes in a rhombohedral system with the R3m space group (C 6v) with the primitive unit cell containing three layers but only one molecule [43, 44]. The layers are stacked in the sequence CBAuABC separated by weak interlayer interaction (often referred to as van der Waals-like). The square symbol represents the empty site available for insertion. The interaction of cleaved InSe crystals with lithium was investigated by electrochemical titration, in situ X-ray diffractometry, and by X-ray photoemission spectroscopy showing a competition between intercalation and chemical decomposition reactions expressed as [45 7]  [Pg.112]

The effect of Li insertion on the electronic structure of InSe has been evidenced by photoluminescence, Raman scattering, and absorption measurements [48, 49]. Upon lithium insertion, one observes different features in the optical spectra of L InSe, which appear to be strongly dependent on the Li concentration. For jc 0.1, a blue shift of the fundamental absorption threshold is due to the destabilization of both the highest valence band and the lowest conduction band. This is attributed to the (5, character of these energy states which interact with the lithium i-orbital. New broad bands appeared at 1.278 and 1.206 eV in the photoluminescence spectrum of Lio jlnSe, which were attributed to transitions associated with the lattice deformations introduced by the expansion perpendicular to the basal plane and to those associated with the lithium donor levels, respectively [49]. [Pg.112]

4 Reliability of the Rigid-Band Model in Lithium Intercalation Compounds [Pg.114]


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