Charge disproportionate molecular redox for discrete memristive and memcapacitive switching

Electronic symmetry breaking by charge disproportionation results in multifaceted changes in the electronic, magnetic and optical properties of a material, triggering ferroelectricity, metal/insulator transition and colossal magnetoresistance. Yet, charge disproportionation lacks technological relevance because it occurs only under specific physical conditions of high or low temperature or high pressure. Here we demonstrate a voltage-triggered charge disproportionation in thin molecular films of a metal-organic complex occurring in ambient conditions. This provides a technologically relevant molecular route for simultaneous realization of a ternary memristor and a binary memcapacitor, scalable down to a device area of 60 nm(2). Supported by mathematical modelling, our results establish that multiple memristive states can be functionally non-volatile, yet discrete-a combination perceived as theoretically prohibited. Our device could be used as a binary or ternary memristor, a binary memcapacitor or both concomitantly, and unlike the existing 'continuous state' memristors, its discrete states are optimal for high-density, ultra-low-energy digital computing. Charge disproportionation in thin molecular films of a metal-organic complex enables the realization of a ternary memristor and binary memcapacitor.

In:Nature Nanotechnology: Springer Science and Business Media LLC15:5, s. 380-3891748-33871748-3395

By the author/editor: Goswami, Sreetos ...; Rath, Santi P.; Thompson, Damien; Hedström, Svante; Annamalai, Meena ...; Pramanick, Rajib; show more...; Ilic, B. Robert; Sarkar, Soumya; Hooda, Sonu; Nijhuis, Christi ...; Martin, Jens; Williams, R. Sta ...; Goswami, Sreebra ...; Venkatesan, T.; show less...

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