Gold-lead sulfide core-shell nanorod photodetector and preparation method thereof

Abstract

The invention provides a gold-lead sulfide core-shell nanorod photodetector and a preparation method thereof. Gold-lead sulfide core-shell nanorods (Au-PbS NRs) with good crystallinity are prepared through a three-step cation replacement method. The growth process of a shell layer includes the following three steps that: 1, a layer of silver is grown around the gold nanorods; 2, silver sulfide isgenerated through a vulcanization reaction; and 3, a lead sulfide shell layer is prepared through a cation exchange reaction. A field effect phototransistor-based Au-PbS NRs photodetector is preparedthrough a liquid phase spin coating technology. The gold nanorods and the lead sulfide semiconductor are combined, so that the performance of the device is enhanced, and therefore, the device is morestable, easy to operate and can be used in a large range. The detection performance such as quantum efficiency, responsivity and detection rate of the specially prepared photodetector is improved several times, and the improvement of the detection performance of the photodetector in a near-infrared band can be also realized. The preparation method has the advantages of simplicity, easiness in operation, rapidness, low cost, capability of realizing large-area production, and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronic devices, in particular to a gold-lead sulfide core-shell nanorod photodetector and a preparation method thereof. Background technique [0002] Photodetectors are the core components of optoelectronic systems, which can convert optical signals into electrical signals that can be stored. After special processing of electrical signals according to different needs, photodetectors are widely used in various fields such as biology, medicine, and military affairs. [0003] Lead sulfide (PbS) has a large exciton Bohr radius (18nm) and a small forbidden band width (0.4eV), and its forbidden band width can be continuously adjusted between 0.4-2.0eV through the quantum confinement effect , can achieve efficient absorption of light in the range of 600nm-3000nm. With the development of nanoscience, some materials with unique properties can be combined to form heterogeneous structures, so as to give full play to ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of complex manufacturing process, high cost and poor detection performance of existing photodetector devices, the present invention proposes a gold-lead sulfide core-shell nanorod photodetector and its preparation method. This combination of semiconductors enhances device performance, which is a more stable, easy-to-manipulate, and widely used photodetector preparation method for gold-lead sulfide core-shell nanorods

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