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7102728 
Journal Article 
Ferroelectric random access memory with high electric properties and high production yield realized by employing an AlOx underlying layer of Pt bottom electrode for a La-doped lead zirconate titanate capacitor 
Wang, W; Hikosaka, Y; Saito, H; Kataoka, Y; Kojima, M; Nomura, K; Nakamura, Ko; Eshita, T; Ozawa, S; Yamaguchi, H; Takai, K; Watanabe, J; Mihara, S; , 
2019 
Yes 
Japanese Journal of Applied Physics
ISSN: 0021-4922
EISSN: 1347-4065 
IOP PUBLISHING LTD 
BRISTOL 
WOS:000450645100003 
Although ferroelectric random access memory (FRAM) has superior electric properties, its downside is that it has a relatively larger cell area in comparison other non-volatile memories. We tried to apply TiOx, and AlOx to an underlying layer (TiOx-UL, AlOx-UL) instead of our previously used Ti underlying layer (Ti-UL) for the La-doped lead zirconate titanate (PLZT) capacitor to obtain a high polarization value aiming to a lowering cell area. The failed bit ratio of the FRAM with TiOx-UL was found to be higher than that with AlOx-UL even though polarization values of the PLZT capacitor with both underlying layers are almost the same and much higher than that with Ti-UL. It is strongly suggested that the imprint induced in PLZT by charged defect is a main cause of bit failure by fail-bit analysis. X-ray diffraction and atomic force microscopy observations shows that charged defect density in PLZT over TiOx -UL is possibly higher than that in PLZT over AlOx-UL due to surface roughness of underlying layers. (C) 2018 The Japan Society of Applied Physics