# Unipolar resistive switching in cobalt titanate thin films

## TL;DR

This paper demonstrates giant unipolar resistive switching in cobalt titanate thin films with excellent charge retention and distinct electrical states, revealing filamentary conduction and stable capacitance behavior.

## Contribution

It reports the first observation of giant unipolar resistive switching in CoTiO3 thin films with detailed electrical and impedance analysis.

## Key findings

- Resistive switching ratio of 10^4
- Charge retention up to 10^4 seconds
- Bulk resistance change dominates switching behavior

## Abstract

We report giant resistive switching of an order of 104, long-time charge retention characteristics up to 104 s, non-overlapping SET and RESET voltages, ohmic in low resistance state (LRS) and space charge limited current (SCLC) mechanism in high resistance state (HRS) properties in polycrystalline perovskite Cobalt Titanate (CoTiO3 ~ CTO) thin films. Impedance spectroscopy study was carried out for both LRS and HRS states which illustrates that only bulk resistance changes after resistance switching, however, there is a small change (<10% which is in pF range) in the bulk capacitance value in both states. These results suggest that in LRS state current filaments break the capacitor in many small capacitors in a parallel configuration which in turn provides the same capacitance in both states even there was 90 degree changes in phase-angle and an order of change in the tangent loss.

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Source: https://tomesphere.com/paper/1703.03662