Review of progress in understanding the electron transport properties of amorphous chalcogenide phase change semiconductors (Invited paper)

The amorphous chalcogenide phase change semiconductors exhibit a series of peculiar yet technologically important electron transport properties, which have attracted intensive research attention in recent years. Despite their promising application scenario, these electron transport properties' fundamental governing physics remains an unsolved scientific puzzle which is still under debate. This paper reviews these measured peculiar electron transport properties, their technological significance, and their existing theoretical explanations. The open questions are summarized, in order to invoke further research attention.