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zn-cuinse 2 Synthetic method of /znse core-shell quantum dots

A technology of zn-cuinse2 and core-shell quantum dots, applied in chemical instruments and methods, nanotechnology for materials and surface science, electrolytic capacitors, etc., can solve the problem of poor repeatability of reactions, increased costs, and difficult control of influencing factors, etc. problem, to achieve the effect of enhanced fluorescence intensity, improved PCE, and simple and easy operation

Active Publication Date: 2022-04-19
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] It can be seen that the various CuInSe described in the prior art 2 Most of the synthesis methods of core-shell quantum dots based on ZnSe-based or ZnSe-based have similar problems, which not only have environmental protection problems, but also increase the cost. Moreover, too many influencing factors will make the reaction difficult to control, and the harsh process conditions make the reaction repeatable. poor

Method used

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  • zn-cuinse <sub>2</sub> Synthetic method of /znse core-shell quantum dots
  • zn-cuinse <sub>2</sub> Synthetic method of /znse core-shell quantum dots
  • zn-cuinse <sub>2</sub> Synthetic method of /znse core-shell quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Example 1Zn-CuInSe 2 / Synthesis of ZnSe quantum dots

[0048] Weigh 22.2 mg (0.2 mmol) of selenium dioxide into a 50 mL round bottom flask, add 3 mL of oleylamine to it, react in an oil bath at 115 ° C for 15 min, cool to room temperature, and obtain the first solution; add 13.1 mg (0.05mmol) copper acetylacetonate, 29.1mg (0.1mmol) indium acetate and 2.75mg (0.015mmol) zinc acetate, reacted in a collector stirrer at 200°C for 10min, cooled to room temperature, and obtained a second solution;

[0049] Centrifuge the second solution at a low speed at 4000r / min and discard the precipitate, add n-hexane to the supernatant obtained from the separation for ultrasonic dispersion, centrifuge at a high speed at 12000r / min and discard the precipitate, add ethanol to the supernatant obtained from the separation for ultrasonication Wash, centrifuge at 12000r / min at high speed and discard the supernatant, add ethanol to the obtained precipitate to wash and centrifuge at 12000r / min...

Embodiment 2

[0078] Example 2 Zn-CuInSe 2 / Synthesis of ZnSe quantum dots

[0079] Weigh 22.2 mg (0.2 mmol) of selenium dioxide into a 50 mL round bottom flask, add 3 mL of oleylamine to it, react in an oil bath at 115 ° C for 15 min, cool to room temperature, and obtain the first solution; add 13.1 mg (0.05mmol) copper acetylacetonate, 29.1mg (0.1mmol) indium acetate and 2.75mg (0.015mmol) zinc acetate, reacted in a collector stirrer at 200°C for 10min, cooled to room temperature, and obtained a second solution;

[0080] Centrifuge the second solution at a low speed at 4000r / min and discard the precipitate, add n-hexane to the supernatant obtained from the separation for ultrasonic dispersion, centrifuge at a high speed at 12000r / min and discard the precipitate, add ethanol to the supernatant obtained from the separation for ultrasonication Wash, centrifuge at 12000r / min at high speed and discard the supernatant, add ethanol to the obtained precipitate to wash and centrifuge at 12000r / mi...

Embodiment 3

[0084] Example 3 Zn-CuInSe 2 / Synthesis of ZnSe quantum dots

[0085] Weigh 22.2 mg (0.2 mmol) of selenium dioxide into a 50 mL round bottom flask, add 3 mL of oleylamine to it, react in an oil bath at 115 ° C for 15 min, cool to room temperature, and obtain the first solution; add 13.1 mg (0.05mmol) copper acetylacetonate, 29.1mg (0.1mmol) indium acetate and 2.75mg (0.015mmol) zinc acetate, reacted in a collector stirrer at 200°C for 10min, cooled to room temperature, and obtained a second solution;

[0086] Centrifuge the second solution at a low speed at 4000r / min and discard the precipitate, add n-hexane to the supernatant obtained from the separation for ultrasonic dispersion, centrifuge at a high speed at 12000r / min and discard the precipitate, add ethanol to the supernatant obtained from the separation for ultrasonication Wash, centrifuge at 12000r / min at high speed and discard the supernatant, add ethanol to the obtained precipitate to wash and centrifuge at 12000r / mi...

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Abstract

The present invention discloses Zn-CuInSe 2 / ZnSe core-shell quantum dot synthesis method, first activate selenium dioxide with oleylamine, then add copper acetylacetonate, indium acetate and zinc acetate to it, and react to obtain Zn-CuInSe 2 The quantum dot solution was centrifuged and washed several times to obtain the intermediate product quantum dot precipitation, which was dispersed in oleylamine and mercaptan for reaction, and then the zinc precursor solution was injected dropwise into it to obtain the target core-shell quantum dot solution. After centrifugation and washing, the target core-shell quantum dots were precipitated. The present invention abandons the use of highly toxic solvent ligands, does not need to control the reaction atmosphere, and only needs to inject zinc precursors at low temperatures to achieve shell coating, and the fluorescent absorption peak of the prepared target core-shell quantum dots is obviously blue. Shift, to achieve a wider light capture range, the fluorescence intensity is significantly enhanced, and the PCE is significantly improved when applied in solar cells.

Description

technical field [0001] The invention belongs to the field of photovoltaic materials, and in particular relates to a synthesis method of quantum dot materials. Background technique [0002] Quantum dot-sensitized solar cells (QDSSCs) are a type of photoelectrochemical solar cells in which semiconductors in the form of quantum dots are used as light-absorbing materials. Quantum dots (Quantum dots) refer to quasi-zero-dimensional nanostructures (generally between 1-10nm) whose three-dimensional dimensions are smaller than the Exciton De Broglie wavelength of the corresponding bulk material, and can be regarded as clusters composed of a small number of atoms. cluster. The special geometric size of quantum dots makes it have unique quantum effects. Based on this, quantum dot materials have unique optical, thermal, magnetic and electrical properties, and can be widely used in solar cells, optical devices and biomarkers. [0003] In the field of photovoltaic cells, one of the mos...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00B82Y40/00H01G9/20H01G9/042
CPCC09K11/02C09K11/883B82Y20/00B82Y30/00B82Y40/00H01G9/20H01G9/2031Y02E10/542
Inventor 邹超冯鹏宇罗丽萍翟兰兰杨云张礼杰
Owner WENZHOU UNIVERSITY
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