Development called Twin BiCS FLASH
Kioxia, formerly known as Toshiba Memory, has announced the development of the world’s first three-dimensional (3D) semicircular split-flash flash memory cell that utilizes floating shutter technology. The new memory is called Twin BiCS FLASH.
Twin BiCS FLASH is superior in performance to conventional cells with a circular charge trap with significantly smaller cell sizes. This makes the new cell a promising candidate for increasing density with fewer layers by increasing the number of recognizable levels (more than QLC).
Increasing the number of layers used to be a relatively simple way to further increase the density, but when the number of layers exceeds 100, the trade-off between complicating the process, maintaining dimensional uniformity and productivity becomes an ever more difficult task. To overcome this problem, Kioxia also developed a new design of a semicircular cell, separating the gate electrode in a conventional round cell to reduce the size.
There is no information on the period of commercialization of the development.