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Copper gallium sulfide/zinc selenide core-shell structure quantum dot and preparation method and application thereof

A core-shell structure, zinc selenide technology, applied in chemical instruments and methods, photosensitive equipment, energy input and other directions, can solve the problems of low stability, high toxicity of quantum dots, and many surface defect states, and achieves good stability, The effect of suppressing non-radiative recombination and increasing photocurrent density

Pending Publication Date: 2022-05-31
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned prior art, the present invention provides a copper gallium sulfur / zinc selenide core-shell quantum dot and its preparation method and application, so as to solve the problem that the existing quantum dots used for sensitizing electrodes have high toxicity and many surface defect states. , the problem of low stability

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  • Copper gallium sulfide/zinc selenide core-shell structure quantum dot and preparation method and application thereof
  • Copper gallium sulfide/zinc selenide core-shell structure quantum dot and preparation method and application thereof
  • Copper gallium sulfide/zinc selenide core-shell structure quantum dot and preparation method and application thereof

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Embodiment 1

[0027] A copper gallium sulfur / zinc selenide core-shell quantum dot, the preparation method comprising the following steps:

[0028] (1) Synthesis of CuGaS 2 (CGS) Nuclear quantum dots: 0.25 mmol cuprous iodide, 0.25 mmol gallium iodide and 2.5 ml oleylamine were placed in a 50 ml three-necked flask with a magnetic stirrer, then the reaction mixture was heated to 70 °C under nitrogen Purge until the color changes to dark green, then inject 0.25 ml of 1-dodecyl mercaptan, the solution then turns to a clear pale yellow, then quickly becomes opaque milky white, and then the temperature is raised to 120 °C, and the solution is heated under nitrogen. It was degassed in the environment for 60min, then heated to 180°C, then injected with 0.25ml of sulfur precursor solution, and kept for 5min to form nuclear layer quantum dots, then heated to 220°C and kept for 20min, after which the reaction was stopped by water bath quenching, and finally the The reaction liquid is transferred to a...

Embodiment 2

[0032] A copper gallium sulfur / zinc selenide core-shell quantum dot, the preparation method comprising the following steps:

[0033] (1) Synthesis of CuGaS 2 (CGS) nuclear quantum dots: 0.25 mmol cuprous iodide, 0.25 mmol gallium iodide and 2.5 ml oleylamine were placed in a 50 ml three-necked flask with a magnetic stirrer, then the reaction mixture was heated to 65 °C under nitrogen Purge until the color changes to dark green, then inject 0.25 ml of 1-dodecyl mercaptan, the solution then becomes clear pale yellow, then quickly becomes opaque milky white, then warm to 110 °C, keep the solution under nitrogen It was degassed in the environment for 65min, then heated to 170°C, then injected with 0.25ml of sulfur precursor solution, and kept for 6min to form nuclear layer quantum dots, then heated to 210°C and kept for 22min, after which the reaction was stopped by water bath quenching, and finally the The reaction liquid is transferred to a centrifuge tube for centrifugal colle...

Embodiment 3

[0037] A copper gallium sulfur / zinc selenide core-shell quantum dot, the preparation method comprising the following steps:

[0038] (1) Synthesis of CuGaS 2 (CGS) nuclear quantum dots: 0.25 mmol cuprous iodide, 0.25 mmol gallium iodide and 2.5 ml oleylamine were placed in a 50 ml three-necked flask with a magnetic stirrer, then the reaction mixture was heated to 75 °C under nitrogen Purge until the color changes to dark green, then inject 0.25 ml of 1-dodecyl mercaptan, the solution then turns to a clear pale yellow, then quickly becomes opaque milky white, then warm to 130 °C, keep the solution under nitrogen It was degassed in the environment for 55min, then heated to 190°C, then injected with 0.25ml of sulfur precursor solution, and kept for 4min to form nuclear layer quantum dots, then heated to 230°C and kept for 18min, after which the reaction was stopped by water bath quenching, and finally the The reaction liquid is transferred to a centrifuge tube for centrifugal co...

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Abstract

The invention discloses a copper gallium sulfur / zinc selenide core-shell structure quantum dot and a preparation method and application thereof, and the preparation method comprises the following steps: firstly synthesizing a CuGaS2 core quantum dot, and then synthesizing a ZnSe shell layer on the surface of the CuGaS2 core quantum dot. The ZnSe shell layer in the core-shell structure quantum dot effectively passivates a large number of surface defects of a CuGaS2 core, improves the stability and effectively inhibits non-radiative recombination, and compared with pure copper-gallium-sulfur quantum dots, the zinc selenide shell layer coating effectively improves the saturation photocurrent of a quantum dot photoelectrochemical cell. The core-shell structure quantum dot can be applied to hydrogen production of a photoelectrochemical cell, and more electrons can be injected into a photoanode, so that the photocurrent density is improved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor energy optoelectronics, and in particular relates to a copper gallium sulfur / zinc selenide core-shell structure quantum dot, a preparation method and an application. Background technique [0002] Photoelectrochemical cell technology is a new type of battery technology that directly utilizes solar energy and converts it into renewable energy (such as hydrogen energy). It usually consists of photoactive semiconductor photoelectrodes, electrolytes and external circuits. Its structure is simple, Compared with the hydrogen production technology of photovoltaic power generation and water electrolysis, it has lower device cost. At present, the hydrogen production technology of semiconductor colloidal quantum dots photoelectrochemical cells cannot be put into practical application on a large scale. [0003] Although quantum dots have been widely used in photoelectrochemical cells due to their tunab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02H01G9/20
CPCC09K11/883C09K11/02H01G9/20Y02P20/133
Inventor 童鑫尤益民王志明李鑫叶航
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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