Applications

Origin of the optical absorption of TlGaSe2 layered semiconductor in the visible range

“…It is well known that chalcogenide materials always contain a high concentration of unsaturated bonds. These dangling bonds cause the formation of intrinsic deep level defects [6,10,11,13,15,58]. The unsaturated bound states or native deep level defects increase the density of localized states near the conduction and valence bands, and consequently decrease the optical band gap.…”

“…Numerous experimental studies have shown that to a large extent, the physical properties of chalcogenide semiconductors are determined by lattice imperfections [5][6][7][8][9][10][11][12][13][14]. The most common of which are vacancies in the chalcogenide sublattice [5][6][7][8][9][10][11][12][13][14].…”

“…Numerous experimental studies have shown that to a large extent, the physical properties of chalcogenide semiconductors are determined by lattice imperfections [5][6][7][8][9][10][11][12][13][14]. The most common of which are vacancies in the chalcogenide sublattice [5][6][7][8][9][10][11][12][13][14]. Although native deep and shallow defects in TlGaSe 2 chalcogenide semiconductors have been intensively investigated and many of their general properties are known [48,[76][77][78], some of them are still under debate and considered to be controversial.…”

“…Semiconductors with layered structures are of great interest because they contain a great variety of intrinsic defects. Theoretically it has been shown that the intrinsic localized states of these defects result in a high density of localized states near the conduction/valance band energy states [5][6][7][8][9][10][11][12][13][14][15].…”

Homopolar bonds in Se-rich Ge‒As‒Se chalcogenide glasses

“…They have an increasing number of important applications in electronics and photonics because of their high optical nonlinearity and wide transmission range. [1][2][3][4][5] For example, researchers have used chalcogenide glasses for all-optical processing of high speed telecommunication signals. [6,7] It has been demonstrated that the glass properties can be tuned in a widely compositional range, therefore, it is possible to optimize the glasses for specific applications by tuning the material composition.…”