Memory cell and an array of memory cells

A memory cell, comprising:

• a first electrode and a second electrode;
• a select device and a programmable device in series with each other between the first and second electrodes, the select device being proximate and electrically coupled to the first electrode, the programmable device being proximate and electrically coupled to the second electrode;
• and
• the programmable device comprising:
• a radially inner electrode having radially outer sidewalls;
• ferroelectric material radially outward of the outer sidewalls of the radially inner electrode;
• a radially outer electrode radially outward of the ferroelectric material;
• one of the radially outer electrode or the radially inner electrode being electrically coupled to the select device, the other of the radially outer electrode and the radially inner electrode being electrically coupled to the second electrode;
• and
• conductive material of the radially inner electrode where between the first and second electrodes being everywhere of a solid pillar shape in a vertical cross section taken through an axial center of the radially inner electrode.

A memory cell, comprising:

• a first electrode and a second electrode;
• a select device and a programmable device in series with each other between the first and second electrodes, the select device being proximate and electrically coupled to the first electrode, the programmable device being proximate and electrically coupled to the second electrode;
• and
• the programmable device comprising:
• a radially inner electrode having radially outer sidewalls;
• ferroelectric material radially outward of the outer sidewalls of the radially inner electrode;
• a radially outer electrode radially outward of the ferroelectric material;
• one of the radially outer electrode or the radially inner electrode being electrically coupled to the select device, the other of the radially outer electrode and the radially inner electrode being electrically coupled to the second electrode;
• and
• the ferroelectric material being of an upwardly open and downwardly open cylinder-like shape in a vertical cross section taken through an axial center of the ferroelectric material.

A memory cell, comprising:

• a first electrode and a second electrode;
• a select device and a programmable device in series with each other between the first and second electrodes, the select device being proximate and electrically coupled to the first electrode, the programmable device being proximate and electrically coupled to the second electrode;
• and
• the programmable device comprising:
• a radially inner electrode having radially outer sidewalls;
• ferroelectric material radially outward of the outer sidewalls of the radially inner electrode;
• a radially outer electrode radially outward of the ferroelectric material;
• one of the radially outer electrode or the radially inner electrode being electrically coupled to the select device, the other of the radially outer electrode and the radially inner electrode being electrically coupled to the second electrode;
• and
• conductive material of the radially outer electrode being of an upwardly open and downwardly open cylinder-like shape in a vertical cross section taken through an axial center of the radially outer electrode.

A memory cell, comprising:

• a first upper electrode and a second lower electrode;
• a select device and a programmable device in series with each other and being elevationally between the first upper electrode and the second lower electrode, the select device being proximate and electrically coupled to one of the first upper electrode and the second lower electrode, the programmable device being proximate and electrically coupled to the other of the first upper electrode and the second lower electrode;
• and
• the programmable device comprising:
• a radially inner electrode having radially outer sidewalls;
• ferroelectric material radially outward of the outer sidewalls of the radially inner electrode;
• a radially outer electrode radially outward of the ferroelectric material;
• one of the radially outer electrode or the radially inner electrode being electrically coupled to the select device, the other of the radially outer electrode and the radially inner electrode being electrically coupled to the second electrode;
• and
• the ferroelectric material being directly against one of the first upper electrode and the second lower electrode but not directly against the other of the first upper electrode and the second lower electrode.

A memory cell, comprising:

• an upper electrode and a lower electrode;
• a select device and a programmable device in series with each other and being elevationally between the upper and lower electrodes, the select device being proximate and electrically coupled to the upper electrode, the select device being above the programmable device, the programmable device being proximate and electrically coupled to the lower electrode, the programmable device being below the select device;
• and
• the programmable device comprising:
• a radially inner electrode having radially outer sidewalls, conductive material of the radially inner electrode where between the first and second electrodes being everywhere of a solid pillar shape in a vertical cross section taken through an axial center of the radially inner electrode;
• ferroelectric material radially outward of the outer sidewalls of the radially inner electrode, the ferroelectric material being of an upwardly open container-like shape in a vertical cross section taken through an axial center of the ferroelectric material;
• a radially outer electrode radially outward of the ferroelectric material, the radially outer electrode being of an upwardly open container-like shape in a vertical cross section taken through an axial center of the radially outer electrode;
• and
• the radially inner electrode of pillar shape being electrically coupled to the select device, the radially outer electrode of container-like shape being electrically coupled to the lower electrode.

A memory cell, comprising:

• an upper electrode and a lower electrode;
• a select device and a programmable device in series with each other and being elevationally between the upper and lower electrodes, the select device being proximate and electrically coupled to the lower electrode, the select device being below the programmable device, the programmable device being proximate and electrically coupled to the upper electrode, the programmable device being above the select device;
• and
• the programmable device comprising:
• a radially inner electrode having radially outer sidewalls, the radially inner electrode being of an upwardly open container-like shape in a vertical cross section taken through an axial center of the radially inner electrode;
• ferroelectric material radially outward of the outer sidewalls of the radially inner electrode;
• a radially outer electrode radially outward of the ferroelectric material, the radially outer electrode being of an upwardly open container-like shape in the vertical cross section;
• the radially outer electrode being electrically coupled to the select device, the radially inner electrode being electrically coupled to the upper electrode, the radially inner electrode projecting elevationally above the radially outer electrode, the radially inner electrode above the radially outer electrode not projecting radially outward of the radially outer electrode.