Scalable lead zirconium titanate (PZT) thin film material and deposition method, and ferroelectric memory device structures comprising such thin film material
US7344589B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2006 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Jan 31, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/02271
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A novel lead zirconium titanate (PZT) material having unique properties and application for PZT thin film capacitors and ferroelectric capacitor structures, e.g., FeRAMs, employing such thin film material. The PZT material is scalable, being dimensionally scalable, pulse length scalable and/or E-field scalable in character, and is useful for ferroelectric capacitors over a wide range of thicknesses, e.g., from about 20 nanometers to about 150 nanometers, and a range of lateral dimensions extending to as low as 0.15 μm. Corresponding capacitor areas (i.e., lateral scaling) in a preferred embodiment are in the range of from about 104 to about 10−2 μm2. The scalable PZT material of the invention may be formed by liquid delivery MOCVD, without PZT film modification techniques such as acceptor doping or use of film modifiers (e.g., Nb, Ta, La, Sr, Ca and the like).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.