WSe₂/WS₂ Heterobilayer Nonvolatile Memory Device with Boosted Charge Retention

Abstract

A two-dimensional (2D) nonvolatile memory device architecture to improve the long-term charge retention with the minimum charge loss without compromising storage capacity and the extinction ratio for practical applications has been an imminent demand. To address the current issue, we adopted a novel type-II band-aligned heterobilayer channel comprising vertically stacked monolayer WSe2 nanodots on monolayer WS2. The band offset modulation leads to electron doping from WSe2 nanodots into the WS2 channel without any external driving electric field. As a result, the tested device outperformed with a memory window as high as 34 V and a negligible charge loss of 7% in a retention period of 10 years while maintaining a high extinction ratio of 106. The doping technique presented in this work provides a feasible route to modulate the electrical properties of 2D channel materials without hampering charge transport, paving the way for high-performance 2D memory devices.

CuBi2O4nanocrystals integrated with polyaniline nanobelt arrays for weak light photomultiplication type photodetector

“…33,39,40 To solve the problems of high dark current and poor absorption efficiency, the photodetectors should use localized electron and photon manipulations. 37,41 Dark current can be efficiently suppressed using techniques such as electrical manipulations by ferroelectric, built-in, and gate electric elds. 30,42,43 By combining with other materials, the response spectrum of a photodetector based on hybrid materials could likewise be widened to the infrared region.…”

High‐Sensitivity Polarized Light Detector of 2D WS2/Mo2CF2 Van Der Waals Heterostructure

“…TMDCs-based vdW is an emerging study tendency for its applications in electronic appliances. [3,4] Recently, Siao et al [5] presented use of WSe 2 /WS 2 vdW heterostructures band offset engineering for nonvolatile memory application. The device maintains a high extinction ratio of 10 6 at 34 V. Previous studies have suggested that MXene creates deep applications in photoelectricity, electron carrier, nanoscale superconductivity, and light sensing.…”