Jae-Hyoung Choi

TiN/HfO/sub 2//TiN capacitor technology applicable to 70 nm generation DRAMs

We have developed a cylindrical TiN/HfO/sub 2//TiN (TIT) capacitor for 70 nm DRAMs application. TIT capacitors with HfO/sub 2/ films deposited by ALD(Atomic Layer Deposition) using Hf(NEtMe)/sub 4/ precursor and O/sub 2/ plasma as a reactant is shown to be applicable to DRAM device below 70 nm design rule for the first time. It shows the thermal budget endurance against back-end process of DRAM device as well as the very low enough Toxeq of about 13 /spl Aring/ to provide the sufficient cell capacitance.