Patent ID: 8563355

Claim:
A method of making a circuit including a phase change memory cell, the method comprising: forming a structure including silicon; forming a transistor, the transistor including a channel region having a first portion located along a first sidewall of the structure including silicon and having a second portion located along a second sidewall of the structure including silicon, the second sidewall being an opposing sidewall to the first sidewall, wherein the forming the transistor includes: forming a control electrode, the control electrode having a first portion adjacent to the first sidewall for controlling conductivity in the first portion of the channel region and a second portion adjacent to the second sidewall for controlling conductivity in the second portion of the channel region; and forming a first current electrode in the structure including silicon and forming a second current electrode in the structure including silicon; forming a separation region in the structure including silicon between the first current electrode and a contact region to form a contact sidewall on the first current electrode in the separation region; forming a heater comprising forming a heater silicide adjacent to the contact sidewall in the separation region; and after forming the heater, forming a phase change structure in the opening in contact with the heater silicide wherein the phase change structure exhibits a first resistive value when in a first phase state and exhibits a second resistive value when in a second phase state, wherein the phase change structure wraps around a pointed corner of the heater.