Leakage Mechanism and Cycling Behavior of Ferroelectric Al 0.7 Sc 0.3 N.

Autor: Chen L; Institute of Microelectronics, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore., Wang Q; Department of Science, Mathematics and Technology, Singapore University of Technology and Design, Singapore 487372, Singapore., Liu C; Institute of Microelectronics, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore., Li M; Institute of Microelectronics, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore., Song W; Institute of Microelectronics, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore., Wang W; Institute of Microelectronics, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore., Loke DK; Department of Science, Mathematics and Technology, Singapore University of Technology and Design, Singapore 487372, Singapore., Zhu Y; Institute of Microelectronics, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2024 Jan 12; Vol. 17 (2). Date of Electronic Publication: 2024 Jan 12.
DOI: 10.3390/ma17020397
Abstrakt: Ferroelectric scandium-doped aluminum nitride (Al 1-x Sc x N) is of considerable research interest because of its superior ferroelectricity. Studies indicate that Al 1-x Sc x N may suffer from a high leakage current, which can hinder further thickness scaling and long-term reliability. In this work, we systematically investigate the origin of the leakage current in Al 0.7 Sc 0.3 N films via experiments and theoretical calculations. The results reveal that the leakage may originate from the nitrogen vacancies with positively charged states and fits well with the trap-assisted Poole-Frenkel (P-F) emission. Moreover, we examine the cycling behavior of ferroelectric Al 0.7 Sc 0.3 N-based FeRAM devices. We observe that the leakage current substantially increases when the device undergoes bipolar cycling with a pulse amplitude larger than the coercive electric field. Our analysis shows that the increased leakage current in bipolar cycling is caused by the monotonously reduced trap energy level by monitoring the direct current (DC) leakage under different temperatures and the P-F emission fitting.
Databáze: MEDLINE
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