SUPERIOR LOW-PRESSURE-OXIDIZED SI3N4 FILMS ON RAPID-THERMAL-NITRIDED POLY-SI FOR HIGH-DENSITY DRAMS

Abstract

High-performance stacked storage capacitors with small effective-oxide-thickness (t(ox),(eff)) as thin as 37 Angstrom has been achieved using low-pressure-oxidized nitride films deposited on NH3-nitrided poly-Si electrodes. The capacitors exhibit excellent leakage property and time-dependent-dielectric-breakdown (TDDB) characteristics. Furthermore, this technique is promising for the 64- and 256-Mb dynamic-random-access-memory (DRAM) applications because the process temperatures never exceed 850 degrees C.