Scanning tunneling spectroscopy of Ag–As–Se ion-conducting glasses

Abstract

Electronic structures of Ag–As–Se glasses, which possess ion-hole mixed conduction, have been studied using a scanning tunneling microscope operating in tunneling-spectroscopy modes. The tunneling spectra show marked dependence on the scan speed of tip voltage. This scan-speed dependence appears to be caused by Ag+-ion migration which is induced by electric fields generated by tips.

As_4S_4 role on the photoinduced birefringence of silver-doped chalcogenide thin films

“…These measurements indicate that, after 90 minutes of exposure, the silver amount in an irradiated area is up to three times higher in comparison to a non-irradiated area. It is well known that in silver chalcogenide films, silver migration is induced toward the irradiated region under light exposure [17,18]. According to Choudhary [19], since there are a large number of dangling bonds in chalcogenide glasses, one would eventually expect a new equilibrium to occur after migration, in which dipoles of Ag + coupled to dangling bonds would form, inducing a rearrangement of atomic structure.…”

Nanoscale modifications of chalcogenide glasses using scanning tunneling microscopes

“…For instance, in Ag 35 As 26 Se 39 glass, the ionic conductivity is ϳ10 Ϫ4 S/cm, which is substantially higher than the electronic ͑hole͒ conductivity of ϳ10 Ϫ6 S/cm. 20 Actually, the ionic motion provides a marked influence upon scanning tunneling spectra. 20 Therefore, we can assume that, when applying negative tip voltages to Ag-As-Se glasses, instead of holes, Ag ϩ ions migrate toward the surface, which may suppress the electronic excitation.…”

“…20 Actually, the ionic motion provides a marked influence upon scanning tunneling spectra. 20 Therefore, we can assume that, when applying negative tip voltages to Ag-As-Se glasses, instead of holes, Ag ϩ ions migrate toward the surface, which may suppress the electronic excitation. It is noted here that, in marked contrast to Ag-Se, Cu-Se bonds are fairly covalent, 21 and no ionic conduction appears in the Cu-chalcogenide glasses.…”

Effect of Heat Treatment on the ac Conductivity and Dielectric Properties of Ag33Sb31Se36Thin Films

“…Little attention has been paid to the ternary compound of the type A I B V C VI [12][13][14] including AgSbSe system. Recently, we have published two papers on the studies of Ag 33 Sb 31 Se 36 system [15,16].…”