Effect of composition on the structure and electrical properties of As-Se-Cu glasses

Abstract

As-Se-Cu glasses, with Cu content varying between 5 and 25 at. %, were produced by quenching from the melt. The values of resistivity and activation energy for conduction decreased continuously with increasing the copper content. Memory switching phenomena was observed in glasses containing Cu less than 20 at. %. Glasses containing higher Cu concentration showed a reverse switching cycle. Thermally induced changes in the structural properties have been examined using x-ray diffraction, differential thermal analysis, and scanning electron microscopy. The results were discussed on the basis of thermally induced transformations.

Electrical switching in germanium telluride glasses doped with Cu and Ag

“…In As 50 Te 45 I 5 glass the memory switching occurs at a field of 1.5 kV/cm [26]. The metal-doped As-Se glasses (As 30 Cu x Se 100−x ) switch at very high fields of the order of 30 kV/cm [27]. It is also worth mentioning that As 30 Cu x Se 100−x glasses for x ≤ 15 exhibit a memory switching whereas glasses with x > 15 exhibit an unusual behaviour of high-conducting ON state to a lowconducting OFF state [27,28].…”

“…The metal-doped As-Se glasses (As 30 Cu x Se 100−x ) switch at very high fields of the order of 30 kV/cm [27]. It is also worth mentioning that As 30 Cu x Se 100−x glasses for x ≤ 15 exhibit a memory switching whereas glasses with x > 15 exhibit an unusual behaviour of high-conducting ON state to a lowconducting OFF state [27,28]. At the time of switching, the temperature of the sample increases considerably, and the material melts and cools to a conducting channel in between the electrodes.…”

Electrical Switching in Cu–As–Se Glasses

“…The samples can be repeatedly switched between the high‐resistance OFF and the low‐resistance ON states with switching voltages reproducible within±5%. The glasses in the range 26≤ x ≤29 at.% of Cu, exhibit an unusual switching from a low‐resistance state (ON) to a high‐resistance (OFF) state as observed by Asahara and Izumitani 25 and Haifz et al 26 . For x ≥30, the glasses show memory switching.…”

Annealing temperature dependence of the optical and structural properties of selenium-rich CdSe thin films

“…(9) and included in Table 2. It is noticed that the values ε ∞(1) are higher than those of ε ∞ (2) . This behavior can be attributed to, the increase in the free carrier contribution [32].…”

“…Chalcogenide glasses have many interesting properties and applications [1,2]. Cadmium selenide system is an example of the wide-bandgap II-VI systems that is considered as a promising semiconductor material for optoelectronics and photovoltaic devices [3][4][5].…”