Investigation on formation process of metal atomic filament for metal sulfide atomic switch by electrical measurement

摘要： We have studied the formation process of the metal atomic filament for the metal sulfide atomic switches by the electrical measurement. The switching between ON and OFF states of the atomic switch is controlled by the application of the bias voltage for the atomic switches. The SET (OFF→ON) and RESET (ON→OFF) voltages were investigated for the atomic switch where the Ag2S or Cu2S layer was sandwiched between the Pt and Ag or Cu electrodes. The SET and RESET voltages of the Ag/Cu2S/Pt and Cu/Ag2S/Pt were close to those of the Ag/Ag2S/Pt atomic switch, and different from those of the Cu/Cu2S/Pt atomic switch. These results indicated that the dominant chemical species of the making and breaking part of the metal filament were Ag, and that the source of the metal filament was both the sulfide layer and the metal electrode.