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A new SONOS memory using source-side injection for programming

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6 Author(s)
Kuo-Tung Chang ; Semicond. Technol. Lab., Motorola Inc., Austin, TX, USA ; Wei-Ming Chen ; Swift, C. ; Higman, J.M.
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We reported a new polysilicon-oxide-nitride-oxide-silicon (SONOS) nonvolatile memory using channel hot electron injection for high-speed programming. For the first time, we demonstrated that source-side injection technique, which is commonly used in floating gate nonvolatile memories for its high programming efficiency, can also be used in a SONOS device for achieving high-speed programming. Erase of the device is achieved by tunneling of electrons through the thin top oxide of the ONO charge storage stack. Since the thin top oxide is grown from the nitride layer, the self-saturated nature of the oxidation allows better thickness control. Endurance characteristics indicates that quality of the thin top grown from nitride is as good as the tunnel oxide grown from the silicon substrate. By increasing the top oxide thickness, it is possible to achieve ten years of retention requirement. The self-aligned sidewall gate structure allows small cell size for high density applications.

Published in:

Electron Device Letters, IEEE  (Volume:19 ,  Issue: 7 )

Date of Publication:

July 1998

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