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Star Polymer with a Metallo-Phthalocyanine Core as a Tunable Charge Storage Material for Nonvolatile Transistor Memory

Abstract

We present a strategy for controlling the device performance of organic field effect transistor (OFET) memory by using a metallo-phthalocyanine (MPc)-cored star-shaped polystyrene as a charge storage material. MPc-cored four-armed star polymers (M = Cu or Zn) with polystyrene arms of three different number-average molecular weights were prepared by atom transfer radical polymerization and cyclization reactions with metal ions; the density of the MPc cores dispersed in the polymer matrix was dependent on the lengths of polymer arms. The charge carrier mobility of pentacene-based OFET memory devices containing the star polymer varied with the nature of the MPc-cored star polymer layer, due to the presence of the MPc core unit, as well as the nanostructures of the polymer thin films. Application of an external gate bias to the OFET device caused significant reversible shifts in the threshold voltage, and the magnitude of the memory shifts were proportional to the weight percentage of MPc cores in the star polymer matrix. The memory device showed a high memory on/off current ratio (>105) and long retention characteristics (>105 s), permitting it to be characterized as a nonvolatile organic memory; the retention time extended on increasing the Mn of the star polymer. MPc-cored star polymer is a promising material design as a charge storage layer for controlling device performance of organic flash memory.

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Publication details

The article was received on 16 Dec 2017, accepted on 11 Jan 2018 and first published on 12 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC05790C
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Star Polymer with a Metallo-Phthalocyanine Core as a Tunable Charge Storage Material for Nonvolatile Transistor Memory

    J. Aimi, P. Wang, C. Shih, C. Huang, T. Nakanishi, M. Takeuchi, H. Hsueh and W. Chen, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05790C

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