Body Doping Profile of Select Device to Minimize Program Disturbance in Three-Dimensional Stack NAND Flash Memory

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概要

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• The program disturbance characteristic in the three-dimensional (3D) stack NAND flash was analyzed for the first time in terms of string select line (SSL) threshold voltage (V_{\text{th}}) and p-type body doping profile. From the edge word line (W/L) program disturbance, we can observe the boosted channel potential loss as a function of SSL V_{\text{th}} and body doping profile for SSL device. According to simulation work, a high V_{\text{th}} of the SSL device is required to suppress channel leakage during programming. When the body doping of the SSL device is high in the channel, there is a large band bending near the gate edge of the SSL adjacent to the edge W/L cell of boosted cell strings, which generates significantly electron--hole pairs. The generated electrons decreases the boosted channel potential, resulting in increase of program disturbance of the inhibit strings. Through optimization of the body doping profile of the SSL device, both channel leakage and the program disturbance are successfully suppressed for a highly reliable 3D stack NAND flash memory cell operation.

• 2013-06-25

著者

• Lee Jong-ho

  School Of Eecs Engineering Kyungpook National University

• Park Byung-Gook

  School of Electrical Engineering & Inter-University Semiconductor Research Center (ISRC), Seoul National University, Shilim-Dong, Kwanak-Gu, Seoul 151-742, Republic of Korea

• Choe Byeong-In

  School of Electrical Engineering and Computer Science (EECS) and Inter-University Semiconductor Research Center (ISRC), Seoul National University, Seoul 151-742, Korea

• Park Byung-Gook

  School of Electrical Engineering and Computer Science (EECS) and Inter-University Semiconductor Research Center (ISRC), Seoul National University, Seoul 151-742, Korea

• Park Byung-Gook

  School of EECS and ISRC, Seoul National University, Seoul 151-742, Korea

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