Grapheme-quantum dot two-color light detector based on composite structure, and preparation method thereof

Abstract

The invention belongs to the technical field of light detectors, and particularly relates to a graphene-quantum dot two-color light detector based on a composite structure, and a preparation method ofthe graphene-quantum dot two-color light detector. Aiming at the defect that one existing graphene-quantum dot hybrid light detector can only detect light with wavelength in a narrow range due to therestriction of quantum dots on light absorption bands, the graphene-quantum dot two-color light detector is characterized by comprising eight layers of lamellar structures including a metal substrate, an insulating layer I, graphene I, quantum dots I, a dielectric layer, graphene II, quantum dots II and an insulating layer II from bottom to top, wherein two electrodes I are arranged on two sidesof the quantum dots I, the two electrodes I serve as a source electrode and a drain electrode respectively; two electrodes II are arranged on two sides of the quantum dots II, the two electrodes II serve as a source electrode and a drain electrode respectively; and the quantum dots I and the quantum dots II are manufactured by using two quantum dot materials respectively. The graphene-quantum dottwo-color light detector is suitable for polychromatic light detection.

Description

technical field [0001] The invention belongs to the technical field of photodetectors, and in particular relates to a graphene-quantum dot two-color photodetector based on a composite structure and a preparation method thereof. Background technique [0002] Graphene is a single-layer two-dimensional planar crystal material formed by carbon atoms arranged in a hexagonal honeycomb shape. Since the team of British physicists Andre Geim and Konstantin Novoselov prepared single-layer graphene at room temperature by mechanical exfoliation in 2004, due to its unique structure and excellent mechanical, The electrical, thermal and optical properties have gradually become a research hotspot. Its atomic layer thickness is only 0.335nm, but it is also the hardest nanomaterial. The unconventional half-integer quantum Hall effect can be observed at room temperature. Intrinsic mobility up to 2×10 5 cm 2 V -1 the s -1 . Graphene is a semi-metallic zero-bandgap material whose bandgap...

AI Technical Summary

Problems solved by technology

In 2012, Gerasimos Konstantatos proposed mixing quantum dots and graphene to prepare a quantum dot-graphene hybrid photodetector. The device has high responsivity, but there are shortcomings such as too much dark current, slow response speed, and low switching ratio.

[0008] Although the existing graphene-quantum dot hybrid photodetectors have high device responsivity and realize the detection of weak energy photons, due to the limitation of the absorption band of light by quantum dots, a detector can only detect wavelengths of light in a small range

Images