High dielectric constant (k) materials are being considered as a replacement for SiO2 and SiN in capacitors for DRAM and RF circuits as critical dimensions of ICs continue to decrease. The transition to a nonsilicon-based dielectric in these applications is not simply a change in materials. It also represents a fundamental change in processing toward deposited dielectrics and away from those that can be thermally grown on bulk or polycrystalline silicon. Dielectrics formed by thermal growth on a similar material have many advantages, including good step coverage, thickness uniformity, and control of interfacial properties. To retain these advantages with deposited materials, one must have good control of interfacial growth properties, such as with epitaxial film growth. We discuss here the importance of the high-k dielectric/metal interface in deciding electrical properties of deposited metal oxide thin films.
|Number of pages||6|
|Journal||Solid State Technology|
|Publication status||Published - Feb 1999|
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Physics and Astronomy (miscellaneous)
- Condensed Matter Physics