# Promising Engineering Approaches for Improving the Reliability of HfZrOx2-D and 3-D Ferroelectric Random Access Memories

Yu De Lin*, Po Chun Yeh, Pei Jer Tzeng, Tuo Hung Hou, Chih I. Wu, Ya Chin King, Chrong Jung Lin

*此作品的通信作者

2 引文 斯高帕斯（Scopus）

## 摘要

The main challenge in ferroelectric (FE) random access memory (FRAM) scaling is to maintain a high polarization density on the vertical sidewall of 3-D FE capacitors. Two simple and effective methods - stress engineering and optimized interface orientation - are proposed to facilitate the preferential transition from the tetragonal to the orthorhombic phase for ferroelectricity. Four FE phase-progressive experiments were conducted for 2-D/3-D FRAMs with external stress sources and an interfacial layer (IL). Both 2-D and 3-D FRAMs show the wake-up free feature with the presence of both the external stressor and the optimized IL. To extract the sidewall polarization of 3-D FRAM, a set of testkeys was designed and studied. The 3-D FRAM shows an initial sidewall with good reliability and durability with ${P} _{r} = {18}\,\,\mu \text{C}$ /cm2 and endurance of up to 109 cycles. Furthermore, the retention test with the read mode of ${P} _{\text {0,switch}}$ and ${P} _{\text {1,switch}}$ at 85 °C was investigated, and the imprint effect was proved to be the main cause of retention loss.

原文 English 9233949 5479-5483 5 IEEE Transactions on Electron Devices 67 12 https://doi.org/10.1109/TED.2020.3028528 Published - 12月 2020