Graphene/carbon nanotube film Schottky junction photodetector and preparation method thereof

Abstract

The invention discloses a graphene / carbon nanotube thin film schottky junction photoelectric detector and a preparation method therefor. The upper surface of an insulating substrate is covered with a carbon nanotube thin film; a silver electrode which is in ohmic contact with the carbon nanotube thin film is arranged at one end of the carbon nanotube thin film while a graphene thin film which is in schottky contact with the carbon nanotube thin film is arranged at the other end of the carbon nanotube thin film; and a second silver electrode which is in ohmic contact with the graphene thin film is arranged on the graphene thin film. The photoelectric detector provided by the invention takes advantage of the broadband spectral absorption characteristic of the carbon nanotube, and is combined with the excellent characteristics of high light transmittance, low resistivity and the like of the graphene, so that detection on the light of 300-1,050nm is realized, and quite high responsivity and response speed are achieved as well; the preparation method is simple; the photoelectric detector is suitable for large-scale production; the broadband-spectrum, high-detectivity and high-response-speed photoelectric detector can be prepared; and a new prospect is explored for the full-carbon-structured photoelectric detection application.

Description

technical field [0001] The invention belongs to the field of semiconductor photoelectric detection, and in particular relates to a graphene / carbon nanotube film Schottky junction photodetector and a preparation method thereof. Background technique [0002] Electromagnetic waves are oscillating particle waves that are diffracted and emitted in space by electric and magnetic fields that are in phase and perpendicular to each other. They are electromagnetic fields that propagate in the form of waves and have wave-particle duality. The light visible to the human eye is an electromagnetic wave with a wavelength in the range of 390-760nm. Generally, the range of photoelectric detection is the ultraviolet-visible-near-infrared band. It is widely used in various fields of military and national economy. For example, it is mainly used in optical communication, flaw detection and optical instruments in the ultraviolet band, and it is mainly used in ray measurement and detection, indust...

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Problems solved by technology

In the field of photoelectric detection, although graphene has a wide absorption bandwidth, there are also obvious disadvantages; intrinsic graphene itself has low light absorption rate and lack of light gain mechanism, resulting in low responsivity of graphene detectors; graphite The photogenerated carrier life of graphene itself is short, only about picoseconds, which makes it difficult to collect photogenerated carriers effectively and seriously affects the responsivity of the detector. Therefore, pure graphene-based detectors cannot meet the needs of practical applications.

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