Phase change memory, electronic device, and preparation method for phase change memory

An electronic device, comprising a controller and a phase change memory, wherein the phase change memory comprises a plurality of phase change memory cells, wherein:

• each of the plurality of phase change memory cells comprises a first electrode, a phase change body, and a second electrode;
• the first electrode, the phase change body, and the second electrode are sequentially arranged in a first direction;
• the phase change body has a first end face and a second end face, the first end face faces the first electrode, and the second end face faces the second electrode;
• and
• the phase change body further comprises a convergence portion, and the convergence portion is located between the first end face and the second end face, wherein
• a sectional area of the convergence portion in a direction perpendicular to the first direction is relatively smaller than an area of the first end face and an area of the second end face, and wherein the phase change body comprises a first phase change sub-body and a second phase change sub-body, an end face of the first phase change sub-body abuts against an end face of the second phase change sub-body and forms the convergence portion, and the sectional area of the convergence portion in the direction perpendicular to the first direction is relatively smaller than an area of the end face of the first phase change sub-body or an area of the end face of the second phase change sub-body;
• and
• the controller is electrically connected to the first electrode and the second electrode.

A preparation method for a phase change memory, comprising:

• preparing a first phase change layer on an upper surface of a first electrode;
• etching the first phase change layer to form a first phase change sub-body;
• preparing an insulator on the upper surface of the first electrode, wherein a thickness of the insulator is greater than a thickness of the first phase change layer;
• etching the insulator to form a through-hole that passes through to the first phase change sub-body;
• preparing a second phase change sub-body in the through-hole;
• and
• preparing a second electrode on an upper surface of the second phase change sub-body.