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Bipolar Resistive Switch Effects in Calcium Fluoride Thin Films Deposited on Silicon Bottom Electrodes

We report on bipolar resistive switches in calcium fluoride thin films deposited on doped silicon bottom electrodes. We found that the resistive switch is a local effect taking place in a small region in the vicinity of the interface with the electrode and discussed its mechanism based on the space-charge-limited current model. The characteristics of the resistive switches are strongly affected by the work functions of electrodes, and in particular, the polarity of the resistive switch can be altered by the choice of the conductive type of the bottom silicon electrode.