In this work, we theoretically and experimentally investigate the working principle and non-volatile memory (NVM) functionality of 2D α-In2Se3 based ferroelectric-semiconductor-metal-junction (FeSMJ). First, we analyze the semiconducting and ferroelectric properties of α-In2Se3 van-der-Waals (vdW) stack via experimental characterization and first-principle simulations. Then, we develop a FeSMJ device simulation framework by self-consistently solving Landau-Ginzburg-Devonshire (LGD) equation, Poisson's equation, and charge-transport equations. Based on the extracted FeS parameters, our simulation results show good agreement with the experimental characteristics of our fabricated α-In2Se3 based FeSMJ. Our analysis suggests that the vdW gap between the metal and FeS plays a key role to provide FeS polarization-dependent modulation of Schottky barrier heights. Further, we show that the thickness scaling of FeS leads to a reduction in read/write voltage and an increase in distinguishability. Array-level analysis of FeSMJ NVM suggests a 5.47x increase in sense margin, 18.18x reduction in area and lower read-write power with respect to Fe insulator tunnel junction (FTJ).
Cite
@article{arxiv.2007.02752,
title = {$\alpha$-In$_2$Se$_3$ based Ferroelectric-Semiconductor Metal Junction for Non-Volatile Memories},
author = {Atanu K. Saha and Mengwei Si and Peide Ye and Sumeet K. Gupta},
journal= {arXiv preprint arXiv:2007.02752},
year = {2020}
}