Synthesis and Memory Device Characteristics of New Sulfur Donor Containing Polyimides

Abstract

The synthesis and memory device characteristics of two new poly[2,7-bis(phenylenesulfanyl) thianthrene-hexafluoroisopropylidenediphthalimide] (APTT-6FDA) and poly[4,4 0 -thiobis(p-phenylenesulfanyl)-hexafluoroisopropylidenediphthalimide] (3SDA-6FDA) are reported. The sulfur-containing APTT and 3SDA as electron donor were designed to enhance electron-donating and charge-transporting characteristics for the device application. The optical band gaps of APTT-6FDA and 3SDA-6FDA estimated from the absorption edges were 3.51 and 3.46 eV, which probably resulted from the difference in the structural coplanarity. The estimated energy levels (HOMO, LUMO) of APTT-6FDA and 3SDA-6FDA were (-5.55, -2.04) and (-5.71, -2.25) eV, respectively. The memory device with the configuration of ITO/polymers/Al showed nonvolatile memory characteristics with the low turn-on threshold voltages of 1.5 V(APTT-6FDA) and 2.5 V(3SDA-6FDA), probably resulting from the difference in the HOMO energy level. Also, the memory devices could be repeatedly written, read, and erased. The on/off current ratios of the devices were all around 10 4 in ambient atmosphere. The relatively higher dipole moments of the sulfur-containing polyimides compared to the triphenylamine-based polyimide provided a stable CT complex for the flash memory device. The above electronic properties were further confirmed by the density functional theory (DFT) method at the B3LYP level with the 6-31G(d) basis set. The present study suggested that the new sulfur-containing polyimides would have potential applications for memory devices.

Tunable electrical memory characteristics by the morphology of self-assembled block copolymers:PCBM nanocomposite films

“…[1][2][3][4][5][6][7] The active layer exhibits distinct high and low conductance responses to applied voltages for application as digital memory devices with simple sandwiched structures. The reported polymer-based systems for such applications included conjugated polymers, [8][9][10] functional polyimides (PIs), [11][12][13] polymers with pendent electroactive chromophores, [14][15][16] and polymeric composites.…”

Physical, optical and gas transport properties of new processable polyimides and poly(amideimide)s obtained from 4,4′-[oxybis(4,1-phenylenethio)]dianiline and aromatic dianhydrides

“…[27][28] High n polymers have been widely proposed for applications in advanced optoelectronic fabrication, such as high-performance components for advanced display devices, encapsulates for organic light-emitting diode devices, microlens component for charge-coupled devices, complementary metal oxide semiconductor image sensors, 20,21,25,28,29 antireflective coatings and for telecommunication systems as optical waveguide devices. 23 Moreover, such PIs are interesting for their potential applications as memory devices, 30 membranes for gas separation 18,19,31 and membranes for fuel cells. 32 Various sulfur-containing PIs have been recently developed.…”

Synthesis, properties, and electrical memory characteristics of new diblock copolymers of polystyrene-block-poly(styrene-pyrene)

“…The lowest unoccupied molecular orbital (LUMO) level was calculated with HOMO and the value of the optical band gap (E g opt ) according to the relation LUMO = HO-MO ? E g opt (eV) [22]. Figure 4 represents the cyclic voltammograms of these three copolymers, and the corresponding electrochemical properties are given in Table 1.…”

“…Electronic resistivetype memory devices using polymers as active elements are shown to efficiently store the data based on the high-and low-conductance response to an applied voltage. Several organic and polymeric memory materials composed of sandwiched layers exhibit memory switching characteristics, including small molecules [12][13][14], conjugated polymers [15][16][17][18][19], non-conjugated polymers (functional polyimide systems [20][21][22][23][24] or polymers with specific pendant chromophores [25][26][27][28][29][30]), and polymer nanocomposites (metal nanoparticle [11,[31][32][33] or fullerene [34][35][36][37] embedded). In contrast to wholly p-conjugated linear polymers, non-conjugated polymers containing pendant p-conjugated moieties [25][26][27][28][29][30] are of interest for their advantages of excellent solubility, tunable morphology, and precisely optoelectronic properties.…”