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A kind of perovskite-PBS quantum dot polycrystalline film and its preparation method and application, near-infrared photodetector

A technology of near-infrared light and quantum dots, applied in chemical instruments and methods, luminescent materials, photovoltaic power generation, etc., can solve problems such as slow response speed and large dark current of photodetector devices

Active Publication Date: 2022-03-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Introduce ions or nanoparticles into the active layer to form defects to achieve high gain of near-infrared photodetectors, but the response speed of the resulting near-infrared photodetectors is only millisecond or microsecond, and the response speed is slow and the photodetection device Larger dark current (Dong, R.et al.An ultraviolet-to-NIR broad spectral nanocomposite photodetector with gain.Advanced Optical Materials[J],2014,2(6):549-554. And Zhou,W.et al. Solution-processed upconversion photodetectors based on quantum dots[J].Nature Electronics,2020,3(5):251-258.)

Method used

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  • A kind of perovskite-PBS quantum dot polycrystalline film and its preparation method and application, near-infrared photodetector
  • A kind of perovskite-PBS quantum dot polycrystalline film and its preparation method and application, near-infrared photodetector
  • A kind of perovskite-PBS quantum dot polycrystalline film and its preparation method and application, near-infrared photodetector

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preparation example Construction

[0048] The present invention also provides a method for preparing the perovskite-PbS quantum dot polycrystalline film described in the above technical solution, comprising the following steps:

[0049] PbI 2 , 2-phenylethylamine hydroiodide, potassium iodide ammonium and the first solvent are mixed to obtain a perovskite precursor solution, and the first solvent includes N,N-dimethylformamide, dimethyl sulfoxide, γ- One of butyrolactone, N,N-dimethylacetamide, N,N-dimethylthioformamide, N-methylpyrrolidone and 1,3-dimethyl-2-imidazolinone;

[0050] Mixing the PbS coordinated quantum dots with a second solvent to obtain the precipitation of the PbS coordinated quantum dots, the second solvent including one of toluene, chlorobenzene, ether and ethylene dichloride;

[0051] Precipitating and mixing the perovskite precursor and PbS coordinated quantum dots to obtain a polycrystalline film precursor;

[0052] The polycrystalline film precursor liquid is formed into a film to obta...

Embodiment 1

[0128] The preparation method of PbS coordinated quantum dots:

[0129] Mix 0.9g (4.04mmol) of PbO, 3mL oleic acid and 6mL octadecene, evacuate under the double-row tube and then pass nitrogen. Insulated and stirred for 3 hours to remove water and oxygen to obtain a transparent and colorless PbO-oleic acid solution;

[0130] Insulate and stir 100mL octadecene at 100°C under vacuum for 2 hours to remove water and oxygen, and set aside;

[0131] Add 20mL of deoxygenated octadecene to the PbO-oleic acid solution to dilute the reaction system, and continue vacuuming at 100°C for 10 minutes, then continue to blow nitrogen into the reaction system to normal pressure and keep the system environment as a nitrogen atmosphere , and finally the system was heated up to 200°C to obtain a colorless and transparent lead-containing precursor solution;

[0132] Mix 420 μL of trimethylsilyl sulfide with 20 mL of octadecene that has been dehydrated and preheated to 200°C to obtain a colorless ...

Embodiment 2～10

[0171] In the preparation method of PbS coordinated quantum dots, the system is heated to T 1 °C, a colorless and transparent lead-containing precursor solution was obtained; 420 μL trimethylsilyl sulfide and 20 mL dehydration oxygen were preheated to T 2 ℃ octadecene mixed; at T 3 After insulated and stirred at ℃ for 3min, the ice bath quenched the reaction; the rest of the technical means were consistent with Example 1 to obtain the perovskite-PbS quantum dot polycrystalline film, wherein the T of Examples 2-10 1 , T 2 and T 3 See Table 2 for temperature settings.

[0172] Temperature setting parameter table in table 2 embodiment 2~10

[0173] T 1

T 2

T 3

Example 2 30 30 120 Example 3 50 50 120 Example 4 70 70 120 Example 5 90 90 120 Example 6 110 110 120 Example 7 130 130 130 Example 8 180 180 180 Example 9 230 230 230 Example 10 240 240 240

[0174] In Examples 2-10, T 1...

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Abstract

The invention belongs to the technical field of near-infrared photodetectors, and in particular relates to a perovskite-PbS quantum dot polycrystalline film, a preparation method and application thereof, and a near-infrared photodetector. The perovskite-PbS quantum dot polycrystalline film provided by the invention comprises blended PbS coordination quantum dots and perovskites; the part of the PbS coordination quantum dots is 2-(4-fluorophenyl)B Amine hydriodate; the perovskite includes (PEA) 2 (MA) 2 Pb 3 I 10 . In the present invention, the introduction of ligand 2-(4-fluorophenyl)ethylamine hydroiodide in the PbS coordinated quantum dots is beneficial to improve the charge transport between the PbS coordinated quantum dots and the perovskite, and increase the current carrying capacity. The mobility of electrons is beneficial to improve the high gain of near-infrared photodetectors; perovskite can introduce shallow defects into polycrystalline films and passivate deep defects at the same time, shallow defects are conducive to increasing the gain, and passivation of deep defects Helps speed up the response.

Description

technical field [0001] The invention belongs to the technical field of near-infrared photodetectors, and in particular relates to a perovskite-PbS quantum dot polycrystalline film, a preparation method and application thereof, and a near-infrared photodetector. Background technique [0002] Infrared light has a strong ability to penetrate biological tissues and has high absorption sensitivity to changes in molecular structure. It is widely used in biological imaging, hyperthermia, health detection, security, night vision and communication. For near-infrared light detectors, high signal-to-noise ratio and the ability to detect weak near-infrared light can meet more application requirements, so high sensitivity is an important parameter for near-infrared light detection. [0003] In recent years, metal halide perovskite materials have been regarded as a new generation of optoelectronic materials, but due to the bandgap of perovskite, the detection wavelength is limited to with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66C09K11/02C09K11/06H01L51/42H01L51/46
CPCC09K11/661C09K11/664C09K11/025C09K11/06H10K30/35Y02E10/549
Inventor 魏浩桐潘挽婷杨柏
Owner JILIN UNIV