Redox driven conductance changes for resistive memory

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Journal titleApplied Physics A: Materials Science and Processing
Pages841850; # of pages: 10
SubjectHydroxide ions; Oxidation state; Polaron formation; Poly-thiophene; Polymer oxidation; Resistance switching; Resistive switching memories; TiO; Conducting polymers; Conductive films; Heterojunctions; Organic conductors; Polarons; Polymer films; Raman spectroscopy; Silicon compounds; Thiophene; Titanium dioxide; Redox reactions
AbstractThe relationship between bias-induced redox reactions and resistance switching is considered for memory devices containing TiO2 or a conducting polymer in "molecular heterojunctions" consisting of thin (2-25 nm) films of covalently bonded molecules, polymers, and oxides. Raman spectroscopy was used to monitor changes in the oxidation state of polythiophene in Au/P3HT/SiO2/Au devices, and it was possible to directly determine the formation and stability of the conducting polaron state of P3HT by applied bias pulses [P3HT = poly(3-hexyl thiophene)]. Polaron formation was strongly dependent on junction composition, particularly on the interfaces between the polymer, oxide, and electrodes. In all cases, trace water was required for polaron formation, leading to the proposal that water reduction acts as a redox counter-reaction to polymer oxidation. Polaron stability was longest for the case of a direct contact between Au and SiO2, implying that catalytic water reduction at the Au surface generated hydroxide ions which stabilized the cationic polaron. The spectroscopic information about the dependence of polaron stability on device composition will be useful for designing and monitoring resistive switching memory based on conducting polymers, with or without TiO2 present. © Springer-Verlag 2011.
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AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology
Peer reviewedYes
NPARC number21272018
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Record identifierd1db0377-caff-44af-8f58-174cf52b4ebd
Record created2014-05-21
Record modified2016-05-09
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