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Fabrication and characterization of metal-ferroelectric-semiconductor non-volatile memory using BaTiO3 film prepared through sol–gel process

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Abstract

In the present work, a metal-ferroelectric-semiconductor (MFS) structure for non-volatile memory application using barium titanate (BaTiO3) thin film is proposed. Sol–gel method is used to prepare the material, while deposition is done through spin-coating. A thin layer of BaTiO3 (BTO) film on a silicon substrate with MFS structure is fabricated followed by N2 dominant gas annealing. The electrical properties and the non-volatile memory operations characteristics of prepared MFS structure with BTO as the ferroelectric thin film are observed and discussed. Two different solvents are used to prepare the sol–gel of BTO material and prepared films are compared on the basis of morphological and electrical properties. It is found that the film prepared by 2-methoxyethol is better than the film prepared by ethanol. The device’s performance is evaluated by changing the annealing temperature and variable sweep voltages. Memory window and leakage current improve at higher annealing temperature with saturation at 650 °C. A maximum of 6 V memory window is achieved for 650 °C annealed device. Saturation in memory window is also observed with respect to the voltage sweep up to − 6 V to + 6 V with a considerable remnant polarization value. Endurance property for the MFS structure shows promising result for the iteration cycle of 1013 using positive up negative down pulse testing. To the best of author’s knowledge, this is the first report on BTO based MFS structure for memory application prepared through sol–gel process.

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Acknowledgements

The XRD characterization of the film was done at Spintronic Lab, Applied Science Department, IIIT-Allahabad. The SEM analysis of the BTO film was done at ACMS, IIT-Kanpur.

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  1. Department of Electronics and Communication Engineering, Indian Institute of Information Technology, Allahabad, Prayagraj, India

    Ajit Debnath, Vibhu Srivastava,  Sunny & Sanjai Singh

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  1. Ajit Debnath
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  2. Vibhu Srivastava
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Correspondence to Sunny.

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Debnath, A., Srivastava, V., Sunny et al. Fabrication and characterization of metal-ferroelectric-semiconductor non-volatile memory using BaTiO3 film prepared through sol–gel process. Appl. Phys. A 126, 36 (2020). https://doi.org/10.1007/s00339-019-3192-6

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