Novel Program Method of String Select Transistors for Layer Selection in Channel-Stacked NAND Flash Memory

In this paper, we propose new string select transistors (SSTs)/dummy SSTs (DSSTs) threshold voltage (Vth) setting methods in simplified channel-stacked array with layer selection by multilevel operation (SLSM). In these methods, SSTs/DSSTs on each layer are set to their targeted Vth values by incremental step pulse program/one erase with various erase voltages, respectively. In the fabricated pseu...