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Emerging Resistive Switching Memories pp 43–61Cite as

RRAMs with Organic Donor and Acceptor

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Part of the book series: SpringerBriefs in Materials ((BRIEFSMATERIALS))

Abstract

Conjugated organic molecules or polymers can be oxidized or reduced. In terms of the redox properties of organic molecules or polymers, they are classified into donor and acceptor. Oxidation or reduction can take place through chemical or electrochemical reaction. After oxidation or reduction, the conductivity of the conjugated organic molecules or polymers is dramatically increased, because the oxidation or reduction can induce charges on the highest occupied molecular orbital (HOMO) or the lowest unoccupied molecular orbital (LUMO) of the organic molecule or polymer. Since the HOMO and LUMO are conjugated π and π* orbitals, respectively, the charges are delocalized. For example, charge-transfer complexes of tetrathiafulvalene (TTF, donor) or TCNQ (acceptor) can have high conductivity [1, 2], and many conjugated polymers like polypyrrole, polythiophene, and PANi become highly conductive after oxidation [3]. Photon can also induce charge transfer between organic donor and acceptor, which is the principle of organic photovoltaic cells [4]. Resistive switches have been observed on devices with organic donor and acceptor. They are attributed to the electric-field induced charge transfer between the organic donor and acceptor.

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Authors and Affiliations

  1. Department of Materials Science, National University of Singapore, Singapore, Singapore

    Jianyong Ouyang

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Ouyang, J. (2016). RRAMs with Organic Donor and Acceptor. In: Emerging Resistive Switching Memories. SpringerBriefs in Materials. Springer, Cham. https://doi.org/10.1007/978-3-319-31572-0_4

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