Effectiveness of <italic>c</italic>-Axis Aligned Crystalline IGZO FET as Selector Element and Ferroelectric Capacitor Scaling of 1T1C FeRAM

Abstract

Aiming to reduce the area of a ferroelectric random access memory (FeRAM), we fabricated an FeRAM having a 1T1C configuration by using a ${c}$ -axis aligned crystalline In-Ga-Zn-O field-effect transistor, which we call OSFET, with a high breakdown voltage. A combination of the OSFET with ${L}/{W}$ of 60 nm/60 nm and a single damascene ferroelectric capacitor (FE-Cap) attained FE-Cap area reduction to $0.06~\mu \text{m}~^{\mathrm{ 2}}$ per cell. The FeRAM achieved a write time of 10 ns, a rewriting endurance of 109 cycles, and a data retention time of 100 min at 85°C. The OSFET is an optimal selector element for emerging memories.

Keywords

• C-axis aligned crystalline In-Ga-Zn-O (CAAC-IGZO)
• 1T1C
• FeRAM
• single damascene