Low-Field Ferroelectricity in 10 nm AlBScN Thin Films
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910208448528384 |
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| author | Tong, Xiaolei Yousefian, Pedram Wang, Ziyi Saravanan, Meenakshi A. Rai, Rajeev Kumar Esteves, Giovanni Stach, Eric A. Olsson III, Roy H. |
| author_facet | Tong, Xiaolei Yousefian, Pedram Wang, Ziyi Saravanan, Meenakshi A. Rai, Rajeev Kumar Esteves, Giovanni Stach, Eric A. Olsson III, Roy H. |
| contents | Ferroelectric aluminum scandium nitride (Al1-xScxN, AlScN) offers CMOS-compatible integration but suffers from high coercive fields and leakage currents that hinder thickness scaling. Further reduction in thickness is essential for low-voltage embedded nonvolatile memory applications. Boron incorporation into AlScN (AlBScN) suppresses leakage current in films down to 40 nm, yet its ferroelectric characteristics in ultrathin films remains unexplored. This letter demonstrates robust ferroelectric switching in 10 nm sputtered AlBScN capacitors with a low coercive field and approximately two orders of magnitude lower leakage than AlScN. Notably, ferroelectric switching was observed at 2.2 MV/cm in capacitance-voltage measurements, and symmetric polarization reversal occurred near 4.6 MV/cm in positive-up-negative-down (PUND) measurements using 2 μs pulses. Moreover, Weibull analysis revealed a breakdown-to-coercive-field ratio (EBD/Ec) of ~2.2. These findings demonstrated AlBScN as a promising candidate for CMOS back-end-of-line (BEOL) compatible ferroelectric applications with improved energy consumption and reduced leakage current. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_08540 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Low-Field Ferroelectricity in 10 nm AlBScN Thin Films Tong, Xiaolei Yousefian, Pedram Wang, Ziyi Saravanan, Meenakshi A. Rai, Rajeev Kumar Esteves, Giovanni Stach, Eric A. Olsson III, Roy H. Materials Science Applied Physics Ferroelectric aluminum scandium nitride (Al1-xScxN, AlScN) offers CMOS-compatible integration but suffers from high coercive fields and leakage currents that hinder thickness scaling. Further reduction in thickness is essential for low-voltage embedded nonvolatile memory applications. Boron incorporation into AlScN (AlBScN) suppresses leakage current in films down to 40 nm, yet its ferroelectric characteristics in ultrathin films remains unexplored. This letter demonstrates robust ferroelectric switching in 10 nm sputtered AlBScN capacitors with a low coercive field and approximately two orders of magnitude lower leakage than AlScN. Notably, ferroelectric switching was observed at 2.2 MV/cm in capacitance-voltage measurements, and symmetric polarization reversal occurred near 4.6 MV/cm in positive-up-negative-down (PUND) measurements using 2 μs pulses. Moreover, Weibull analysis revealed a breakdown-to-coercive-field ratio (EBD/Ec) of ~2.2. These findings demonstrated AlBScN as a promising candidate for CMOS back-end-of-line (BEOL) compatible ferroelectric applications with improved energy consumption and reduced leakage current. |
| title | Low-Field Ferroelectricity in 10 nm AlBScN Thin Films |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2511.08540 |