High-k gadolinium and aluminum scandates for hybrid floating gate NAND flash
GdxSc1?xOy and Sc1?xAlxOy dielectrics are implemented in hybrid-FG flash devices. Large memory window and good retention is demonstrated for Sc1?xAlxOy (k-value?14). The low GdxSc1?xOy (k?21) breakdown field makes it unsuitable for our applications. The crystallinity of the films correlates well with the program memory performance. Retention is linked to the robustness of the IGD against Ti, N and Si diffusion.
floating gate nand flash high-k dielectrics scandium-based ternary oxides