Patent ID: 8551839

Claim:
A method of fabricating non-volatile storage, comprising: forming active areas including a first active area and a second active area, said first active area including a first substrate region and a first floating gate, said first floating gate includes a lowest surface, said second active area including a second substrate region and a second floating gate, said second floating gate includes a lowest surface; and forming an isolation region between said first substrate region and said second substrate region, said forming an isolation region includes performing isotropic etching to create a first section of said isolation region that forms a first concave cut-out shaped area in said first substrate region and forms a second concave cut-out shaped area in said second substrate region, and performing anisotropic etching to form a second section of said isolation region that is below the first section of said isolation region, said lowest surface of said first floating gate hangs over said first concave cut-out shaped area as a result of said isotropic etching, said lowest surface of said second floating gate hangs over said second concave cut-out shaped area as a result of said isotropic etching.