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  • Title: Organic nonvolatile resistive switching memory based on molecularly entrapped fullerene derivative within a diblock copolymer nanostructure.
    Author: Jo H, Ko J, Lim JA, Chang HJ, Kim YS.
    Journal: Macromol Rapid Commun; 2013 Feb 25; 34(4):355-61. PubMed ID: 23281144.
    Abstract:
    Organic nonvolatile resistive switching memory is developed via selective incorporation of fullerene derivatives, [6,6]-phenyl-C61 butyric acid methyl ester (PCBM), into the nanostructure of self-assembled poly(styrene-b-methyl methacrylate) (PS₁₀ -b-PMMA₁₃₀) diblock copolymer. PS₁₀ -b-PMMA₁₃₀ diblock copolymer provides a spatially ordered nanotemplate with a 10-nm PS nanosphere domain surrounded by a PMMA matrix. Spin casting of the blend solution of PS₁₀ -b-PMMA₁₃₀ and PCBM spontaneously forms smooth films without PCBM aggregation in which PCBM molecules are incorporated within a PS nanosphere domain of PS₁₀ -b-PMMA₁₃₀ nanostructure by preferential intermixing propensity of PCBM and PS. Based on the well-defined PS₁₀-b-PMMA ₁₃₀/PCBM nanostructure, resistive random access memory (ReRAM) exhibits significantly improved bipolar-switching behavior with stable and reproducible properties at low operating voltages (RESET at 1.3 V and SET at -1.5 V) under ambient conditions. Finally, flexible memory devices are achieved using a nanostructured PS₁₀ -b-PMMA₁₃₀ /PCBM composite in which no significant degradation of electrical properties is observed before and after bending.
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