Sputtered Ferroelectric Hafnium-Zirconium Oxide with High Remanent Polarization after Back-End-of-Line Compatible Annealing
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
The back-end-of-line (BEOL) processing compatibility of sputtered ferroelectric hafnium zirconium oxide (HZO) thin films is demonstrated on sputtered TiN/HZO/TiN thin-film ferroelectric capacitors. This promises an easy integration of HfO2-based ferroelectrics for applications such as non-volatile memories. It is found that the sputtering pressure can significantly influence the film growth and morphology of HZO layers. At a sputtering pressure of 5 × 10-3mbar, deposited HZO films show high remanent polarization (Pr) after 400 °C annealing, indicating a high fraction of the polar orthorhombic crystal structure. Additionally, the ferroelectric properties of HZO films were improved by proper tuning of sputtering power. We are able to show that a BEOL-compatible thermal budget (at 400 °C for 1 h) is enough to provoke good ferroelectricity with the 2Prof up to 36 μC/cm2and an endurance of up to 107cycles in sputtered HZO films. With such modifications, the sputtered HZO films become comparable to atomic-layer deposited HZO films with a similar thermal budget.
Details
Original language | English |
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Pages (from-to) | 6142-6148 |
Number of pages | 7 |
Journal | ACS applied electronic materials |
Volume | 4 |
Issue number | 12 |
Publication status | Published - 27 Dec 2022 |
Peer-reviewed | Yes |
External IDs
unpaywall | 10.1021/acsaelm.2c01259 |
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WOS | 000892856000001 |
ORCID | /0000-0003-3814-0378/work/142256255 |
Keywords
Research priority areas of TU Dresden
DFG Classification of Subject Areas according to Review Boards
Subject groups, research areas, subject areas according to Destatis
ASJC Scopus subject areas
Keywords
- back-end-of-line, ferroelectric, hafnium zirconium oxide, process pressure, sputtering, Ferroelectric, Hafnium zirconium oxide, Process pressure, Back-end-of-line, Sputtering