Physics of switching and memory effects in chalcogenide glassy semiconductors

Abstract

Time Reset Set Read T m T g Fig. 2. Active region temperature during writing (set) and erasing (reset).Fig. 33. Dependences of V 0 /T on T 0 . The transition tem perature T* is indicated near the curves; V 0 = F 0 L.

Role of the changing sign of effective electron–electron correlation energy for information recording in PCM

“…As a result at T ¼ 300 K the conductivity increases by a factor of 10 5 . This shows that the nonlinear conductivity and the sufficient increase of the current while data recording in chalcogenide-based phasechange memory [14,15] may be due to the correlation energy sign change in strong electric field and the conductivity transition.…”

Switch Elements with S-Shaped Current-Voltage Characteristic in Models of Neural Oscillators

“…An electrical switching (ES) is an abrupt, significant, and reversible change in the conductivity of an electric element under the applied electric field or a flowing current. Current-voltage characteristic (I-V) of the element contains areas with negative differential resistance (NDR), created by the positive feedback of current (S-type I-V) or voltage (N-type I-V) [21][22][23][24]. However, this feedback is internal and is not created by external circuit elements, like in radio circuits with operational amplifiers.…”

“…In the amorphous semiconductors material class, the phenomena of electrical instability are mainly studied in chalcogenide glasses (CGSs), which contain elements of VI group (Se, S, and Te) and elements of the type Si, Ge, Bi, Sb, As, and P). In CGSs, the switching can have the stable part of NDR (Figure 1a), the unstable part of NDR ( Figure 1b), and the memory effect ( Figure 1c) [21]. Among transition metal oxides, S-type threshold switching is observed in metal-oxide-metal (MOM) structures based on Nb 2 O 5 , NbO 2 , TiO 2 , VO 2 , Ta 2 O 5 , Fe oxide, and some other oxides [22,24].…”

Nanostructure of amorphous films

“…Amorphous chalcogenide films have a wide range of varying physical and chemical properties, which find applications in electronics and optoelectronics [1][2][3][4][5]. Functionality of thin films obtained from glassy materials often derives from their structure at different length scales.…”