اثر عدم تعادل دروازه به منبع / تخلیه در ورودی منبع ورودی شاتکی مانع شارژ سلول های حافظه با دامنه با استفاده از تکرار برنامه ریزی تکراری برنامه ریزی عددی

This work numerically elucidates the effects of gate-to-source/drain misalignments on source-side injection Schottky barrier charge-trapping memory cells. The coupling of Schottky barriers and trap charges generate particular Schottky barrier lowering and source-side injection, while the charge-coupled Schottky barriers must be considered concurrently with the precise positions of metallic source/drain junctions. Numerical programming-trapping iterations were employed to examine the distribution of electron injections and trapped charges in the charge-coupled cells, and to discuss the differences of physical mechanisms among the aligned, overlapped, and underlapped cells. The overlapped cells produce a mildly high programming and reading currents because of the shorter effective lengths. However, the underlapped cells suffer severely from the degradation of electron drain current, hot-carriers injection, and threshold-voltage shift because of widened tunneling barrier, reduced electric field, and invalid injection location. Mildly gate-to-source/drain overlap should be designed in Schottky barrier charge-trapping memories to avoid the underlapped offsets, ensuring favorable programming and reading performance.