Apparatuses and methods to control body potential in memory operations
Some embodiments include apparatuses and methods having a memory cell string including memory cells located in different levels of the apparatus and a data line coupled to the memory cell string. The memory cell string includes a pillar body associated with the memory cells. At least one of such apparatus can include a module configured to store information in a memory cell among memory cells and/or to determine a value of information stored in a memory cell among memory cells. The module can also be configured to apply a voltage having a positive value to the data line and/or a source to control a potential of the body. Other embodiments are described.
1. An apparatus comprising:
a memory cell string including memory cells located in different levels of the apparatus, the memory cell string including a body associated with the memory cells;
a source coupled to the memory cell string;
a data line coupled to the memory cell string; and
a module configured to perform at least one of storing information in a memory cell among the memory cells and determining a value of information stored in a memory cell among the memory cells during a first time interval of an operation, to apply a voltage having a positive value to a control gate of a selected memory cell among the memory cells of the memory cell string during a second time interval of the operation, and to apply a voltage having a positive value to at least one of the source and the data line during the second time interval of the operation for controlling a potential of the body.
2. The apparatus of claim 1 , wherein the module being configured to apply a voltage having a positive value to at least one of the source and the data line during a second time interval of the operation comprises the module being configured to induce drain leakage current in at least a portion of the body during the second time interval.
3. The apparatus of claim 1 , wherein the module being configured to apply a voltage having a positive value to at least one of the source and the data line during a second time interval of the operation comprises the module being configured to inject holes into the body during the second time interval.
4. The apparatus of claim 1 , wherein the module being configured to apply a voltage having a positive value to at least one of the source and the data line during a second time interval comprises the module being configured to apply a voltage having a positive value to the data line during the second time interval and to apply a voltage having a positive value to the source during the second time interval.
5. The apparatus of claim 1 , wherein the module is configured to apply a voltage having ground potential to a control gate of an unselected memory cell among the memory cells of the memory cell string during the second time interval.
6. The apparatus of claim 1 , wherein the module is configured to apply a voltage having a positive value to a control gate of an unselected memory cell among the memory cells of the memory cell string control gate during at least a portion of the second time interval.
7. The apparatus of claim 1 , wherein the module is configured to perform a read operation during one of the first and second time intervals.
8. The apparatus of claim 1 , wherein the module is configured to perform a write verify stage during one of the first and second time intervals.
9. The apparatus of claim 1 , wherein the module is configured to apply a first voltage having a positive value to the source during one of the first and second time intervals, and to apply a second voltage having a positive value to the data line during one of the first and second time intervals.
10. A method comprising:
performing an operation on a memory cell among memory cells of a memory cell string of a device during a first time interval of the operation, the memory cells of the memory cell string located in different levels of the device, the memory cell string including a body associated with the memory cells and coupled to a data line and a source of the device; and
inducing drain leakage current in at least a portion of the body during a second time interval of the operation while a voltage on a control gate of the memory cell has a positive value during at least a portion of the second time interval.
11. The method of claim 10 , wherein performing the operation includes storing information in the memory cell.
12. The method of claim 10 , wherein performing the operation includes determining a value of information stored in the memory cell.
13. The method of claim 10 , wherein performing the operation includes determining whether a value of information stored in the memory cell reaches a target value.
14. The method of claim 10 , wherein performing the operation during the first time interval includes applying a voltage having a first value during at least a portion of the first time interval to a select gate associated with a select transistor of the memory cell string; and wherein inducing drain leakage current during a second time interval includes applying a voltage having a second value during at least a portion of the second time interval to the select gate, wherein the second value is less than the first value.
15. A method comprising:
determining, during a first time interval of an operation, a value of information stored in a selected memory among memory cells of a memory cell string, the memory cells of the memory cell string located in different levels of a device, the memory cell string including a body associated with the memory cells;
applying a voltage having a positive voltage value to a control gate of the selected memory cell during a second time interval of the operation; and
applying a voltage having a positive value to at least one of a data line coupled to the memory cell string and a source coupled to the memory cell string during a second time interval of the operation to control a potential of the body.
16. The method of claim 15 , wherein applying a voltage having a positive value to at least one of a data line coupled to the memory cell string and a source coupled to the memory cell string during a second time interval of the operation to control a potential of the body comprises applying a voltage having a positive value to the data line during the second time interval and applying a voltage having a positive value to the source during the second time interval.
17. The method of claim 15 , further comprising:
applying a voltage having ground potential to a control gate of an unselected memory cell among the memory cells of the memory cell string during the second time interval.
18. The method of claim 15 , further comprising:
applying a voltage having a positive value to a control gate of an unselected memory cell among the memory cells of the memory cell string during at least a portion of the second time interval.
19. The apparatus of claim 15 , further comprising holding the control gate of the selected memory cell at a positive voltage value after the second time interval.
20. The apparatus of claim 19 , further comprising holding a control gate of an unselected memory cell among the memory cells of the memory cell string at a positive voltage value after the second time interval.