Abstract:
Memory devices and programming methods for memories are disclosed, such as those adapted to program a memory using an increasing channel voltage for a first portion of programming, and an increasing but reduced channel voltage for a second portion of programming.
Abstract:
Memory devices are disclosed, such as those that include a semiconductor-on-insulator (SOI) NAND memory array having a boosting plate. The boosting plate may be disposed in an insulator layer of the SOI substrate such that the boosting plate exerts a capacitive coupling effect on a p-well of the memory array. Such a boosting plate may be used to boost the p-well during program and erase operations of the memory array. During a read operation, the boosting plate may be grounded to minimize interaction with p-well. Systems including the memory array and methods of operating the memory array are also disclosed.
Abstract:
Apparatuses, such as memory devices, memory cell strings, and electronic systems, and methods of forming such apparatuses are shown. One such apparatus includes a channel region that has a minority carrier lifetime that is lower at one or more end portions, than in a middle portion. Other apparatuses and methods are also disclosed.
Abstract:
Methods for forming a string of memory cells and apparatuses having a vertical string of memory cells are disclosed. One such string of memory cells can be formed at least partially in a stack of materials comprising a plurality of alternating levels of control gate material and insulator material. A memory cell of the string can include floating gate material adjacent to a level of control gate material of the levels of control gate material. The memory cell can also include tunnel dielectric material adjacent to the floating gate material. The level of control gate material and the tunnel dielectric material are adjacent opposing surfaces of the floating gate material. The memory cell can include metal along an interface between the tunnel dielectric material and the floating gate material. The memory cell can further include a semiconductor material adjacent to the tunnel dielectric material.
Abstract:
Memory arrays and their formation are disclosed. One such memory array has a string of series-coupled memory cells with a substantially vertical portion. A distance between adjacent memory cells at one end of the substantially vertical portion is greater than a distance between adjacent memory cells at an opposing end of the substantially vertical portion. For other embodiments, thicknesses of respective control gates of the memory cells and/or thicknesses of the dielectrics between successively adjacent control gates may increase as the distances of the respective control gates/dielectrics from the opposing end of the substantially vertical portion increase.
Abstract:
Methods for forming a string of memory cells and apparatuses having a vertical string of memory cells are disclosed. One such string of memory cells can be formed at least partially in a stack of materials comprising a plurality of alternating levels of control gate material and insulator material. A memory cell of the string can include floating gate material adjacent to a level of control gate material of the levels of control gate material. The memory cell can also include tunnel dielectric material adjacent to the floating gate material. The level of control gate material and the tunnel dielectric material are adjacent opposing surfaces of the floating gate material. The memory cell can include metal along an interface between the tunnel dielectric material and the floating gate material. The memory cell can further include a semiconductor material adjacent to the tunnel dielectric material.
Abstract:
Apparatuses, such as memory devices, memory cell strings, and electronic systems, and methods of forming such apparatuses are shown. One such apparatus includes a channel region that has a minority carrier lifetime that is lower at one or more end portions, than in a middle portion. Other apparatuses and methods are also disclosed.
Abstract:
Methods for sensing and memory devices are disclosed. One such method for sensing determines a threshold voltage of an n-bit memory cell that is adjacent to an m-bit memory cell to be sensed. A control gate of the m-bit memory cell to be sensed is biased with a sense voltage adjusted responsive to the determined threshold voltage of the n-bit memory cell.
Abstract:
Memory devices and methods are disclosed, including a method involving erasing a block of memory cells. After erasing the block, and before subsequent programming of the block, a number of bad strings in the block are determined based on charge accumulation on select gate transistors. The block is retired from use if the number of bad strings exceeds a threshold. Additional embodiments are disclosed.
Abstract:
Memory devices and methods of operating memory devices are shown. Configurations described include a memory cell string having an elongated n type body region and having select gates with p type bodies. Configurations and methods shown can provide a reliable bias to a body region for memory operations such as erasing.