Interface Engineering of Ag-${\rm GeS}_{2}$ -Based Conductive Bridge RAM for Reconfigurable Logic Applications

In this paper, we show performance and reliability improvement of Ag- GeS
₂
-based conductive bridge RAM (CBRAM) devices by addition of a 2-nm-thick HfO
₂
layer between the electrolyte and the W bottom electrode. Our optimized dual-layer electrolyte stack (2-nm HfO
₂
-30-nm GeS
₂
) leads to a resistance ratio (R
_OFF
/R
_ON
) higher than 10
⁶
and projected 10 years read disturb immunity at 0.04 V. The improved memory resistance ratio is explained by means of physical modeling. Using compact modeling and circuit level simulations, we show that our optimized CBRAM device, integrated in a 1T-2R architecture, fits well with the aggressive requirements of field programmable gate array-type reconfigurable applications. Nonvolatility, back-end-of-line compatibility, and 1.3-nA leakage current during continuous reverse read operation at 1 V are strong benefits demonstrated on our device for such applications.