Patent ID: 6969654
Filing Date: 2005-11-29
Classification: H01L

Abstract:
1. A method of fabricating a flash nonvolatile read-only memory (NVROM) semiconductor device having ultraviolet (UV) charge immunity, the method comprising: providing a semiconductor substrate: forming an oxide-nitride-oxide (ONO) layer on the semiconductor substrate; forming at least one control gate on the ONO layer; forming a first high temperature oxide (HTO) layer over the at least one control gate and the ONO layer; forming a UV blocking layer over the first HTO layer; forming a second HTO layer over the UV blocking layer; and forming a borophosphosilicate (BPSG) interlayer dielectric (ILD) layer over the second HTO layer; wherein the UV blocking layer substantially prevents UV light from reaching a nitride layer of the ONO layer.