Two-Dimensional WSe 2 /Organic Acceptor Hybrid Nonvolatile Memory Devices Based on Interface Charge Trapping.

Two-dimensional (2D) materials, with atomic thickness and unique electronic structure, hold great potentials for electronic device applications. Charge transfer at the interface of 2D materials further provides a versatile platform toward applications in electronics. Here, we report non-volatile memory devices based on interface charge trapping between 2D WSe and organic electron acceptors. The 2D WSe-organic acceptor hybrid structure exhibits high storage performance, such as large gate memory windows, high on/off ratios (>10), long retention time (>1000 s). Further analysis has revealed that organic acceptors with stronger electron affinity (i.e., higher redox potential) have larger electron trapping ability and hence better memory performance.