Journal
IEEE ELECTRON DEVICE LETTERS
Volume 44, Issue 8, Pages 1276-1279Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2023.3288298
Keywords
Hysteresis; ion migration; memristor; metal halide perovskite; negative resistance; numerical simulation; silvaco atlas TCAD
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Bias voltage scan rate and mobile ion concentration greatly influence the J-V curves of metal halide perovskite-based memristors. In addition to hysteresis, some J-V curves also exhibit a drop in current known as negative differential resistance. This feature is usually attributed to electrochemical reactions and air exposure, but its origin in devices with low-reactive electrodes is still debated. This work proposes a theoretical model based on ionic-electronic drift-diffusion, shedding light on the processes behind hysteresis and explaining the appearance of negative resistance in memristors with low-reactive contacts and capacitive hysteresis. Experimental J-V curves are presented to validate the model.
Bias voltage scan rate and mobile ion concentration have a strong influence in J-V curves of metal halide perovskite-based memristors. In addition to hysteresis, in some cases J-V curves also show an anomalous drop in current known as negative differential resistance. This feature is usually related to electrochemical reactions between the reactive metal and I(- )ions, and to air exposure. However, in devices with low-reactive electrodes, its origin is still under debate. In this work, we propose a theoretical model based on ionic-electronic drift-diffusion. This model sheds light into the ionic electronic processes that shape hysteresis, and it helps to explain the appearance and evolution of a negative resistance in memristors with low-reactive contacts and capacitive hysteresis. Finally, experimental J-V curves are presented to validate the proposed model.
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