Language: English

Investigating resistive switching behaviour in ion implanted metal oxide thin films for realization of bio-synaptic behaviour at Nanoscale

Speaker: Dr. Ashis K. Manna
Venue & Time: (Online: ) @ 01:00 pm

Day & Date: Thursday, 29th March 2023


Rapid advances in information technology rely on high-speed and large-capacity non volatile memories. Resistive switching (RS) based nanoscale memory devices have emerged as one of the potential candidates in information technology. Transition metal-oxides (TMO) have been extensively investigated for developing RS devices. In the present study, TiO2 and ZnO thin films deposited by RF magnetron sputtering method on Au/Ni/SiO2 /Si substrates were implanted with 50 keV Ti ions at different fluences ranging from 1×1010 – 1×1015 ions/cm2. X-ray diffraction and Raman results suggest modification of crystalline properties of the films as a function of ion fluence. Local resistive switching phenomenon has been investigated by conducting atomic force microscopy. Results show a clear RS phenomenon for the films implanted at the highest fluence. The development of conducting filaments, formed by the migration of many oxygen vacancies generated during ion implantation, can be responsible for this behaviour. An ion-induced phase transformation phenomenon has also been investigated in the case of TiO2 thin film. In a metal oxide-based RS device, the hardware implementation of bio-synaptic behaviour can be well realised. A filamentary model mediated by oxygen vacancy can facilitate bio-synaptic behaviour in these two terminal-RS devices. Because to their outstanding characteristics, these metal oxide-based RS devices have attracted a great deal of attention in developing next-generation vision sensors such as Optoelectronic random-access memory (ORAM) devices and gas sensor applications.


Dr. Ashis Kr. Manna, working as a Post-Doc Fellow at Indian Institute Of Technology (IIT), Bhubaneswar. He entered the organization in April of 2021. Before joining IIT Bhubaneswar, he spent a brief period of time (4 months) at the Institute for plasma Research (IPR) in Gandhinagar. He worked as a Research Associate for one year (2019-2020) at the Institute of Physics in Bhubaneswar (IOPB). He completed PhD from Institute Of Physics Bhubaneswar on 2019. He has also one year teaching experience at Ramakrishna Mission Vidyamandira Belur, an autonomous degree college affiliated to University of Calcutta.

Co-sponsored by: Prof Sandip Mondal