Multistate, Ultrathin, Back-End-of-Line-Compatible AlScN Ferroelectric Diodes.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38830113.
- Also identified by DOI 10.1021/acsnano.4c03541.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The growth in data generation necessitates efficient data processing technologies to address the von Neumann bottleneck in conventional computer architecture. Memory-driven computing, which integrates nonvolatile memory (NVM) devices in a 3D stack, is gaining attention, with CMOS back-end-of-line (BEOL)-compatible ferroelectric (FE) diodes being ideal due to their two-terminal design and inherently selector-free nature, facilitating high-density crossbar arrays. Here, we demonstrate BEOL-compatible, high-performance FE diodes scaled to 5, 10, and 20 nm FE Al<sub>0.72</sub>Sc<sub>0.28</sub>N/Al<sub>0.64</sub>Sc<sub>0.36</sub>N films. Through interlayer (IL) engineering, we show substantial improvements in the on/off ratios (>166 times) and rectification ratios (>176 times) in these scaled devices. These characteristics also enable 5-bit multistate operation with a stable retention. We also experimentally and theoretically demonstrate the counterintuitive result that the inclusion of an IL can lead to a decrease in the ferroelectric switching voltage of the device. An in-depth analysis into the device transport mechanisms is performed, and our compact model aligns seamlessly with the experimental results. Our results suggest the possibility of using scaled Al<sub><i>x</i></sub>Sc<sub>1-<i>x</i></sub>N FE diodes for high-performance, low-power, embedded NVM.