Scanning-tunneling-microscope modifications of Cu(Ag)-chalcogenide glasses

Structural considerations about the (Ge0.25Se0.75)100−xAgx glasses

“…The network forming character of Ge is apparently unchanged [10,12,13]. The basic framework of this structure is based on the Ge y Se 100Ày glassy network: The SRO is due to Ge(Se 1=2 ) 4 tetrahedrons [10,12]. In the case of the Ag atom, the position of the first-neighbor at 2.62-2.68 A A agrees with Ag-Se distances found in Ag 8 GeSe 6 and Ag 2 Se crystalline compounds [10,12].…”

“…Therefore, the knowledge of optical, electrical, thermal and structural properties of Ag-chalcogenide amorphous materials is of essential importance. The ternary systems Ag-As-S [1][2][3], Ag-As-Se [1,[3][4][5][6], Ag-Ge-S [3,7,8], Ge-Se-AgI [9] and Ag-Ge-Se [7,[10][11][12][13][14][15][16] were studied.…”

Conduction behaviour and thermoelectric power of Agx (As0.4Se0.6) 100−x chalcogenide system

“…These results indicate that, at any given temperature the d.c. conductivity increases with increasing Ag content, a matter that can be attributed to its ionic nature. Accordingly [15], the ionic conduction of Ag is larger than its electronic conduction. However, the valance band structures indicates different nature of Ag-Se bonds in Ag-As-Se systems.…”

“…where e is the electron charge and A is a dimensionless parameter which concerns the carrier scattering mechanism [15] or assumed to be a measure of the kinetic energy transported by carries [21]. The plus sign holds for the p-type and minus sign holds for n-type semiconductors, respectively.…”

Nanoscale modifications of chalcogenide glasses using scanning tunneling microscopes

“…19 That is, upon application of negative tip voltages of Ϫ3 to Ϫ5 V, ''sombrero'' shaped deformations, consisting of hillocks surrounded by grooves, appear. Such a shape of STM-induced deformations is rare, for which some unknown mechanism may be concealed.…”