A source of negative capacitance in organic electronic devices observed by impedance spectroscopy: Self-heating effects

作者：Okumoto Hajime^*; Tsutsui Tetsuo

来源：Applied Physics Express, 2014, 7(6): 061601.

DOI：10.7567/APEX.7.061601

Self-heating effects in organic electronic devices are investigated by impedance spectroscopy (IS). A temperature modulation of the admittance couples the gigantic imaginary part of the capacitance to its small real part, which results in negative capacitance at low frequencies with high bias. We present a model to explain the effects and verify it experimentally for hole-only devices and organic light-emitting diodes. The negative capacitance widely observed in various electronic devices can be explained, at least in the organic electronic devices, by self-heating effects. The generic effects, which smear the device details, need to be eliminated to obtain IS signals that reflect the intrinsic device-specific properties.

• 出版日期2014-6