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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
Published on: August 17, 2017
Investigation of Program Efficiency Overshoot in 3D Vertical Channel NAND Flash with Randomly Distributed Traps.
Chanyang Park1, Jun-Sik Yoon1, Kihoon Nam1
1Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Investigating incremental step pulse programming slope (ISPP) in 3D NAND flash memory revealed that random variations and excessive tunneling cause programming overshoot and threshold voltage broadening. Understanding these issues is key for reliable multi-bit storage.
Area of Science:
- * Solid-state device physics
- * Semiconductor memory technology
- * Nanoscale device characterization
Background:
- * Three-dimensional (3D) NAND flash memory utilizes vertical nanowire channels for increased density.
- * Incremental Step Pulse Programming (ISPP) is a technique for storing multiple bits per cell.
- * Random variations in programming can lead to abnormal cell behavior and data errors.
Purpose of the Study:
- * To investigate the origins of random variations in ISPP for 3D NAND flash memory.
- * To analyze the impact of excessive tunneling and abnormal programming on cell characteristics.
- * To clarify the physical mechanisms behind over-programming and threshold voltage distribution widening.
Main Methods:
- * Experimental measurement of numerous 3D NAND flash memory cells using ISPP.
- * Distinguishing between read variation and over-programming during cell analysis.
- * 3D Monte-Carlo simulation to model randomness and identify physical origins of over-programming.
Main Results:
- * Excessive tunneling from the channel to the storage layer was identified as a cause of program efficiency overshoot.
- * Abnormal program cells lead to a broadening of the threshold voltage distribution.
- * 3D Monte-Carlo simulations revealed that program step voltage and randomly distributed trap sites in the nitride are key contributors to over-programming.
Conclusions:
- * The study quantitatively analyzed the concurrent effects of program step voltage and trap site distribution on ISPP variations.
- * Findings elucidate the origins of variation and overshoot in ISPP, particularly concerning randomly located nanoscale traps.
- * Enhanced understanding of random over-programming can help mitigate obstacles for multi-bit storage techniques in 3D NAND flash memory.

