Retention Characteristics of (Bi,La)4Ti3O12 Films on Si(100) Substrates Using LaAlO3 Buffer Layers
We demonstrate the ferroelectric behavior of (Bi,La)4Ti3O12 (BLT) films deposited on Si(100) substrates by using LaAlO3 buffer layers. LaAlO3 films were prepared by molecular beam deposition method. Then, they were subjected to ex situ dry N2 annealing in a rapid thermal annealing furnace. From the capacitance-voltage measurement, the dielectric constant of LaAlO3 was estimated to be 20 to 26. On these structures, BLT films were deposited by sol-gel method and they were characterized by X-ray diffraction analysis. It was found from capacitance-voltage measurements that the characteristics showed a hysteresis loop and the memory window was about 0.5 V for the voltage sweep of ±9 V. It was also found from the retention measurement that the higher and lower capacitance values in the hysterisis loop could be distinguished at least for 3 days. It is concluded from these results that the BLT/LaAlO3/Si(100) structure is one of the most promising structures for realizing MFISFETs (metal-ferroelectric-insulator-semiconductor field effect transistors).
Keywords: BLT; FeRAM; LaAlO3; MFIS structure; memory window; retention
Document Type: Research Article
Affiliations: 1: Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan 2: Frontier Collaborative Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
Publication date: 01 January 2003
- Information for Authors
- Subscribe to this Title
- Ingenta Connect is not responsible for the content or availability of external websites
- Access Key
- Free content
- Partial Free content
- New content
- Open access content
- Partial Open access content
- Subscribed content
- Partial Subscribed content
- Free trial content