Accurate Evaluation of High-k HZO/ZrO2 Films by Morphotropic Phase Boundary
SCIE
SCOPUS
- Title
- Accurate Evaluation of High-k HZO/ZrO2 Films by Morphotropic Phase Boundary
- Authors
- OH, SEUNGYEOL; JANG, HO JUNG; Hwang Hyunsang
- Date Issued
- 2024-01
- Publisher
- Institute of Electrical and Electronics Engineers
- Abstract
- This study evaluates HfxZr1-xO2 (HZO)-based high-k dielectrics, where dielectric constant (k) is significantly enhanced through structural engineering. The investigation focuses on their dielectric characteristics by pulse operation for DRAM applications. HZO/ZrO2 (HZZ) films with different superlattice structures display different dielectric behaviors, including ferroelectricity, morphotropic phase boundary (MPB), and anti-ferroelectricity. The HZZ film at the MPB condition exhibits exceptionally high k value of 62 even at voltage of 1 V, which is attributed to the abundance of phase boundaries facilitating phase transition in the superlattice structure. Conversely, the HZZ films with ferroelectric and anti-ferroelectric properties exhibit lower-than-expected k values compared to capacitance measurement, due to overestimation caused by polarization switching. Furthermore, the HZZ film at the MPB condition demonstrates robust endurance above 10(12) cycles (k>45 @10(15) cycles, extrapolation). These findings highlight the potential of HZZ films at the MPB to replace conventional DRAM capacitors, offering superior dielectric properties.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/120810
- DOI
- 10.1109/LED.2023.3331001
- ISSN
- 0741-3106
- Article Type
- Article
- Citation
- IEEE Electron Device Letters, vol. 45, no. 1, page. 28 - 31, 2024-01
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