Semiconductor memory device and fabrication method thereof

A semiconductor memory device comprises a heater electrode, a phase change portion, and an upper electrode. The phase change portion is connected to the heater electrode in a first direction. The upper electrode has an upper surface, a lower surface and a hole. The hole pierces the upper electrode b...

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Bibliographische Detailangaben
1. Verfasser: Hayakawa, Tsutomu
Format: Patent
Sprache:eng
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