New Fullerene-Based Polymers and Their Electrical Memory Characteristics

Abstract

Covalent incorporations into polymers of fullerene were achieved via the Cu(I)-catalyzed azide−alkyne click polymerizations of a fullerene derivative monomer functionalized with 5-(trimethylsilyl)pent-4-yn-1-yl groups and a comonomer functionalized with azidomethyl groups, producing the novel fullerene polymers P1-C 60 and P2-C 60 . Despite their extremely high fullerene loading levels, the polymers were soluble in common organic solvents and exhibited no aggregation of fullerene units in films. Moreover, devices containing these fullerene polymers were easily fabricated with common coating processes that exhibit excellent unipolar and bipolar flash memory characteristics as well as unipolar permanent memory characteristics, with high ON/OFF current ratios, long retention times, and low power consumption. These electrical switching behaviors were favorably operated by electron injection. Overall, these devices are the first n-type bipolar and unipolar digital polymer memory devices which can be operated in flash and write-once-read-many-times modes.

New photopatternable polyimide and programmable nonvolatile memory performances

“…Moreover, their superior flexibility, toughness, dimensional stability and device properties can be easily tuned by tailoring their chemical structures during synthesis. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] However, the realization of high-density polymeric memory devices in a low-cost manner is highly constrained by the fact that the majority of reported polymeric memory materials will readily degrade or dissolve upon exposure to the solvents or wet chemicals used in multilayer device fabrication processes. [21][22][23][24][25] Although some of these materials have high dimensional and mechanical stability, their film forms are not sufficiently resilient to survive the device fabrication process.…”

High-performance triazole-containing brush polymers via azide–alkyne click chemistry: a new functional polymer platform for electrical memory devices

“…[16][17][18][19] Thus far, numerous electrical memory polymers composed either of fully π-conjugated backbones [17][18][19][21][22][23][24][25] or of nonconjugated backbones bearing only electron-donor units or both electron-donor and -acceptor units as parts of the backbone and/or side groups have been reported. [18][19][20][26][27][28][29] In particular, the majority of the nonconjugated polymers have been synthesized with carbazole, triphenylamine, fluorine and their derivatives. [18][19][20][26][27][28][29] Moreover, they are known to mainly exhibit p-type electrical memory characteristics.…”

“…[18][19][20][26][27][28][29] In particular, the majority of the nonconjugated polymers have been synthesized with carbazole, triphenylamine, fluorine and their derivatives. [18][19][20][26][27][28][29] Moreover, they are known to mainly exhibit p-type electrical memory characteristics. In contrast, n-type memory polymers have rarely been reported.…”

“…In contrast, n-type memory polymers have rarely been reported. 20,30 Therefore, research on functional polymers with highperformance electrical memory characteristics remains in the early developmental stages.…”

Synthesis and Preliminary Characterization of a PPE-Type Polymer Containing Substituted Fullerenes and Transition Metal Ligation Sites

“…While there has been considerable interest in the research community that incorporate fullerene C 60 into -conjugated polymeric systems for nearly a decade (some containing transition metal chromophores) [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], these systems use relatively complicated structures that do not facilitate efficient electronic communication between the two moieties [36,37]. In contrast, our relatively simple synthetic strategy provides a more robust connection between the subunits and presumably more efficient electronic interactions.…”