Methods, devices and processes for multi-state phase change devices

摘要

Devices include multiple phase change materials connected in parallel between electrodes. Memory cells with multiple parallel phase change materials can be programmed to transition among more than two states representing multiple bits of information. Methods for manufacture and use are also disclosed.

主权项

1. A phase change device comprising at least two different phase change materials connected in parallel between electrodes, wherein the at least two different phase change materials comprise a first phase change material and a second phase change material, wherein a crystalline state resistance of the second phase change material is distinguishably larger than a crystalline state resistance of the first phase change material, and wherein each of the first phase change material and the second phase change material is configured to undergo a phase change that is caused by self-heating.