Patent ID: 7242050
Filing Date: 2007-07-10
Classification: G11C,H01L

Abstract:
1. A non-volatile memory cell comprising: a substantially single crystalline substrate of a first conductivity type having a planar surface; a trench in said planar surface, said trench having a side wall and a bottom; a floating gate in said trench spaced apart and insulated from said sidewall and from said bottom; said floating gate having a tip away from said bottom; a first region of a second conductivity type in said bottom; a second region of a second conductivity type along said planar surface, spaced apart from said first region; a channel region between said first region and said second region, said channel region only along said sidewall, said floating gate spaced apart and along said entire channel region; a control gate, positioned above the planar surface, capacitively coupled to said floating gate and capable of effecting erase; and a tunnel material between said tip and said control gate, wherein said tunnel material is a tunnel oxide and configured to permit Fowler-Nordheim tunneling of charges from said floating gate to said control gate.