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The mechanism of negative capacitance, e.g. inductance, induced by asufficient electrical field in the organic device is investigated. The cationsin organic bulk are proposed to be driven by the applied voltage and toaccumulate at the interface, and further to generate the surface states ormedia states. These states result in a larger junction current through thedevice, indicating the negative capacitances which are simulated in threesituations: impedance spectrum, capacitance measurement and current response.This simple kinetic model may be helpful to understand why the negativecapacitance phenomenon is observed in various organic devices.

A possible mechanism for the negative capacitance observed in organic devices