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Gold nanorod-lead sulfide quantum dot photodetector and preparation method thereof

A technology of gold nanorods and photodetectors, which is applied in the field of gold nanorods-lead sulfide quantum dot photodetectors and its preparation, can solve the problems of limiting large-scale applications, low carrier mobility, small light absorption cross section, etc. , to achieve the effect of performance improvement, detection degree improvement, and controllable process parameters

Inactive Publication Date: 2020-01-17
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a photodetector composed only of PbS quantum dots, its relatively small light absorption cross-section and low carrier mobility limit its large-scale application.

Method used

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  • Gold nanorod-lead sulfide quantum dot photodetector and preparation method thereof
  • Gold nanorod-lead sulfide quantum dot photodetector and preparation method thereof
  • Gold nanorod-lead sulfide quantum dot photodetector and preparation method thereof

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preparation example Construction

[0038] The preparation method of the gold nanorod-lead sulfide quantum dot photodetector of the present invention comprises the following steps:

[0039] Preparation of lead sulfide quantum dot PbS QDs solution;

[0040] Preparation of gold nanorod Au NRs solution: prepare gold seed solution and growth solution, add gold seed solution to the growth solution to make gold nanorod Au NRs solution;

[0041] Preparation of gold nanorods-lead sulfide quantum dot photodetector: Spin-coat the lead sulfide quantum dot PbS QDs solution on the back gate substrate, then perform surface ligand exchange on the quantum dots, and spin-coat the quantum dots in the first pass After exchanging with the ligand, the gold nanorod Au NRs solution was spin-coated on the back-gate substrate, and then placed in a vacuum oven to obtain a gold nanorod Au NRs coating; The second pass of quantum dot spin coating and ligand exchange is carried out on the coating, and after completion, it is placed in a vac...

Embodiment approach

[0057] Such as figure 1 Shown is an embodiment of the gold nanorod-lead sulfide quantum dot photodetector of the present invention, the gold nanorod-lead sulfide quantum dot photodetector utilizes the gold nanorod-lead sulfide quantum dot light The detector is prepared by the method of preparation. The gold nanorod-lead sulfide quantum dot photodetector includes Au source 1, Au drain 2, silicon dioxide gate insulating layer 3, n-type heavily doped silicon chip 4 and gold nanorod-lead sulfide quantum dot Sandwich structure 5; the silicon dioxide gate insulating layer 3 is located on the n-type heavily doped silicon wafer 4, the Au source 1 and the Au drain 2 are located on the silicon dioxide gate insulating layer 3 to form a back gate substrate, gold The nanorod-lead sulfide quantum dot sandwich structure 5 is spin-coated on the back gate substrate, and is located between the Au source 1 and the Au drain 2; the gold nanorod-lead sulfide quantum dot sandwich structure 5 is two...

specific Embodiment

[0060] A method for preparing a gold nanorod-lead sulfide quantum dot photodetector, comprising the following steps:

[0061] Configure 50mg·mL -1 Preparation of lead sulfide quantum dot PbS QDs solution, specifically:

[0062] Preparation of cadmium sulfide quantum dot CdS QDs solution: add 0.28g reddish-brown cadmium oxide powder CdO, 1.5mL oleic acid OA, 18mL octadecene ODE into a three-necked flask, put in a rotating magnet, feed high-purity argon, and exhaust After exhausting the air, heat to 260°C for 20 minutes. After the solution becomes clear, remove the heat source and cool naturally. Add 360ul ammonium sulfide solution to 10mL oleylamine with a pipette gun, and mix well. When the temperature in the flask dropped to 30°C, quickly inject the prepared ammonium sulfide solution into the flask, mix evenly, stop stirring, and keep warm for 1 hour. Add excess ethanol to terminate the reaction, centrifuge, remove the supernatant, dry the remaining lemon-yellow cadmium su...

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Abstract

The invention provides a gold nanorod-lead sulfide quantum dot photodetector and a preparation method thereof. The method comprises the following steps: preparing a lead sulfide quantum dot PbS QDs solution, preparing a gold nanorod Au NRs solution and preparing a gold nanorod-lead sulfide quantum dot photodetector; according to the invention, the gold nanorod-lead sulfide quantum dot photodetector with a lead sulfide quantum dot PbS QDs-gold nanorod Au NRs-lead sulfide quantum dot PbS QDs sandwich layered structure is prepared on a back gate substrate by a layered spin coating method. Compared with a pure lead sulfide photodetector, the quantum efficiency, responsivity and detection degree of the photodetector prepared through the provided method are greatly improved, the photodetector has good photoelectric performance, and wide-spectrum detection from visible light to near-infrared light can be achieved. The method has the advantages of being simple, low in cost, rapid, capable of achieving large-area production, high in practicability and the like.

Description

technical field [0001] The invention belongs to the technical field of nano-semiconductor devices, in particular to a gold nanorod-lead sulfide quantum dot photodetector and a preparation method thereof. Background technique [0002] Colloidal lead sulfide quantum dots have outstanding characteristics such as size-tunable band gap, multi-exciton effect, and high fluorescence quantum yield, and have been regarded as one of the most promising optoelectronic materials. Solution preparation is another advantage of lead sulfide quantum dots, and its synthesis method is relatively mature, which can be divided into the preparation of lead precursor solution and the injection of sulfur source. [0003] The chemical properties of gold nanorods are relatively stable, and they are fully absorbed in the visible light region. Plasmons will be formed on the surface under light, and they have surface-enhanced Raman scattering and biocompatibility. [0004] Colloidal lead sulfide quantum d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/113H01L31/0352H01L31/032H01L31/18
CPCH01L31/0324H01L31/035218H01L31/1136H01L31/18Y02P70/50
Inventor 赵新宏李亮亮段永胜李凯方永初
Owner JIANGSU UNIV
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