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Issue 3, 2015
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Nonvolatile memories using the electrets of conjugated rod-coil block copolymer and its nanocomposite with single wall carbon nanotubes

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Abstract

We report high performance pentacene based organic field-effect transistor (OFET) memory devices using the electrets of conjugated rod-coil block copolymers, poly[2,7-(9,9-dihexylfluorene)]-block-poly(stearyl acrylate) (PF-b-PSA) and their nanocomposites with single-wall carbon nanotubes (SWCNT). The self-assembled PF-b-PSA electret, with the PF nanorods covered by the crystalline PSA block, exhibited a distinct hole-trapping capability due to the high electrical field generated in the confined dimension of the nanorods. Thus, it could effectively reduce the current leakage and stabilize data retention with a large memory window (35.8 V) and a high ON/OFF ratio over 104 s. Furthermore, the memory window of the device was further improved to 49.2 V by wrapping well-dispersed single-wall carbon nanotubes (SWCNT) in PF-b-PSA. The bundles of PF nanorods along the SWCNT effectively capture electrons and maintain retention characteristics similar to that of the PF-b-PSA device. This study demonstrated that the self-assembled conjugated rod-coil block copolymers and their nanocomposites could act as charge-storage electrets for high performance OFET memory devices through the precise morphology control.

Graphical abstract: Nonvolatile memories using the electrets of conjugated rod-coil block copolymer and its nanocomposite with single wall carbon nanotubes

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Publication details

The article was received on 06 Oct 2014, accepted on 06 Nov 2014 and first published on 11 Nov 2014


Article type: Paper
DOI: 10.1039/C4TC02233E
Citation: J. Mater. Chem. C, 2015,3, 551-558
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    Nonvolatile memories using the electrets of conjugated rod-coil block copolymer and its nanocomposite with single wall carbon nanotubes

    Y. Chiu, C. Shih and W. Chen, J. Mater. Chem. C, 2015, 3, 551
    DOI: 10.1039/C4TC02233E

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