As one of the most important members of the two dimensional chalcogenide family, molybdenum disulphide (MoS2) has played a fundamental role in the advancement of low dimensional electronic, optoelectronic and piezoelectric designs. Here, we demonstrate a new approach to solid state synaptic transistors using two dimensional MoS2 floating gate memories. By using an extended floating gate architecture which allows the device to be operated at near-ideal subthreshold swing of 77 mV/decade over four decades of drain current, we have realised a charge tunneling based synaptic memory with performance comparable to the state of the art in neuromorphic designs. The device successfully demonstrates various features of a biological synapse, including pulsed potentiation and relaxation of channel conductance, as well as spike time dependent plasticity (STDP). Our device returns excellent energy efficiency figures and provides a robust platform based on ultrathin two dimensional nanosheets for future neuromorphic applications.
@article{arxiv.1904.03387,
title = {A high-performance MoS2 synaptic device with floating gate engineering for Neuromorphic Computing},
author = {Tathagata Paul and Tanweer Ahmed and Krishna Kanhaiya Tiwari and Chetan Singh Thakur and Arindam Ghosh},
journal= {arXiv preprint arXiv:1904.03387},
year = {2019}
}