Polarity-dependent memory switching in devices with SnSe and SnSe2 crystals

Abstract
Polarity‐dependent memory switching has been observed in devices of crystalline SnSe and SnSe2 with aluminum contacts. Two types of low‐level switching (1 V/1 mA) with reversed polarity dependence can be obtained in suitably formed devices of either material. In addition, a high‐level (100 V/10 mA) polarized memory switching can be obtained in either device. The low‐level switching appears to involve an electronic process, while the high‐level switching is associated with an electrothermally driven mass transport.