Method for manufacturing EEPROM with periphery

摘要

The step of forming source and drain regions (48', 55') for LV transistors includes the steps of forming sacrificial spacers (101) laterally to LV gate regions (43a); forming LV source and drain regions (55') in a self-aligned manner with the sacrificial spacers (101); removing the sacrificial spacers (101); forming HV gate regions (43d) of HV transistors; forming gate regions (43c) of selection transistors; forming control gate regions (43b) of memory transistors; simultaneously forming LDD regions (48') self-aligned with the LV gate regions (43a), HV source and drain regions (64) self-aligned with the HV gate regions (43d), source and drain regions (65a, 65b) self-aligned with the selection gate region (43c) and floating gate region (27b); depositing a dielectric layer; covering the HV and memory areas with a protection silicide mask (72); anisotropically etching the dielectric layer, to form permanent spacers (52') laterally to the LV gate regions (43a); removing the protection silicide mask (72); and forming silicide regions (75a1, 75a2) on the LV source and drain regions (48', 55') and on the LV gate regions (43a).