Optoelectronic Memory Using Two-Dimensional Materials

Abstract

An atomically thin optoelectronic memory array for image sensing is demonstrated with layered CuIn7Se11 and extended to InSe and MoS2 atomic layers. Photogenerated charge carriers are trapped and subsequently retrieved from the potential well formed by gating a 2D material with Schottky barriers. The atomically thin layered optoelectronic memory can accumulate photon-generated charges during light exposure, and the charges can be read out later for data processing and permanent storage. An array of atomically thin image memory pixels was built to illustrate the potential of fabricating large-scale 2D material-based image sensors for image capture and storage.

The direct-to-indirect band gap crossover in two-dimensional van der Waals Indium Selenide crystals

“…Near the VB edge, the constant energy contours have the form of a ring in k- space and the 2D density of states develops a one-dimensional Van Hove singularity789, a property that could lead to tuneable magnetism, superconductivity, and enhanced thermoelectricity1011. These findings have the potential to extend further the prospects of InSe as a material for several technologies and devices, which range from field effect transistors (FETs)1213 with record high room temperature electron mobility ( μ  = 0.2 m 2 V −1 s −1 )13 to bendable14 and high-gain15 photodetectors, image sensors16, and photon sources17.…”

Atomic Layer Growth of InSe and Sb2Se3 Layered Semiconductors and Their Heterostructure

“…Among these is the C-M-M-C family, which has been drawing more attention [8,9]. These materials have been used to produce photocatalysts, photo-detectors, image sensors, and transistors with high electron mobility [10][11][12][13]. We are currently investigating 2D semiconductor layers of this family of chalcogenide material that are composed of two metal and two Se atoms, Se-M-M-Se (M = In, Sb) grown via atomic layer deposition (ALD).…”

Revealing the importance of surface morphology of nanomaterials to biological responses: Adsorption of the villin headpiece onto graphene and phosphorene

“…By controlling the layer number and strain, black phosphorus can cover the infrared spectrum range that is of great interest for applications in medical imaging [14]. The unique electronic properties have also attracted great interest of many researchers in the fields of electronics [15][16], nanophotonics [17][18][19] and optoelectronics [20,21].…”