Post-treatment method for regulating and controlling two-dimensional perovskite crystallization process by utilizing ethanol

A technology of perovskite and ethanol, applied in the field of materials, to achieve the effects of mild conditions, improved fluorescence lifetime, and improved fluorescence intensity

Active Publication Date: 2019-12-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, one of the main problems existing in 2D perovskites at present lies in its preparation

Method used

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  • Post-treatment method for regulating and controlling two-dimensional perovskite crystallization process by utilizing ethanol
  • Post-treatment method for regulating and controlling two-dimensional perovskite crystallization process by utilizing ethanol
  • Post-treatment method for regulating and controlling two-dimensional perovskite crystallization process by utilizing ethanol

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Experimental program
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Embodiment 1

[0040] A kind of ethanol post-treatment of the present invention regulates two-dimensional perovskite (OA) 2 (MA)Pb 2 I 7 A method for a crystallization process, comprising the steps of:

[0041] Step 1, will utilize the (OA) prepared by spin-coating method 2 (MA)Pb 2 I 7 The crystal film is placed in the sample chamber;

[0042] Step 2, dry N with a flow rate of 3L / min 2 (moisture content less than 20%) into the sample chamber, duration 3min;

[0043] Step 3, dry N with a flow rate of 3L / min 2 (water content less than 20%) The method of passing 50mL of ethanol liquid blows ethanol vapor into the sample chamber for 3 minutes;

[0044] Step 4, cut off the ethanol supply, dry N with a flow rate of 3L / min 2 (moisture content less than 20%) into the sample chamber, duration 3min;

[0045] Step 5. Repeat steps (3) to (4), and alternately pass 3min dry N 2 and ethanol vapor, a total of 3 times.

Embodiment 2

[0047] To (OA) of Example 1 2 (MA)Pb 2 I 7 The crystal thin film is characterized and analyzed, and the specific steps include:

[0048] (1) Changes in fluorescence intensity

[0049] (OA) 2 (MA)Pb 2 I 7 The fluorescence intensity of the crystal film was recorded in real time by a self-built wide-field fluorescence microscope. A 450nm semiconductor laser was used as an excitation source, a 40x objective lens (Olympus LUCPlanFI, NA=0.6) was used, and an electron multiplier charge coupler (Andor, iXon Ultra 888) was used as a detector. The exposure time is 100ms, and the video of the fluorescence intensity change is collected in real time. The results are as follows: Figure 4 as shown in a. From Figure 4 It can be seen in a that after introducing ethanol at 3min, (OA) 2 PB 4 (n=1) crystals appeared; and only with ethanol vapor passed, (OA) 2 PB 4 The fluorescence intensity of the crystal will only increase. It is worth noting that, in the ethanol / N 2 Ambience sw...

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Abstract

The invention discloses a post-processing method for regulating and controlling a two-dimensional perovskite crystallization process by utilizing ethanol. The post-processing method comprises the following steps: (1) placing a formed two-dimensional perovskite crystal film in a sample bin; (2) feeding inert gas into a sample bin; (3) blowing inert gas and ethanol steam into a sample bin; (4) stopping blowing the ethanol steam, and continuously feeding the inert gas into the sample bin; and (5) repeating the steps (3)-(4) for 2-5 times. The method is mild in condition, can be executed at room temperature, is simple in process and easy to operate, and is free of high-temperature annealing; under the condition, the phase transformation of two-dimensional perovskite (OA)2(MA)Pb2I7 is realized,and the fluorescence intensity and the fluorescence lifetime of the two-dimensional perovskite (OA)2(MA)Pb2I7 are improved by two times.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a post-processing method for regulating the crystallization process of two-dimensional perovskite by using ethanol. Background technique [0002] In recent years, organometallic halide perovskites have become one of the research hotspots in the field of photovoltaic materials due to their high light absorption coefficient, long charge carrier diffusion length, and simple solution method preparation. At present, organometal halide perovskites are widely used in solar cells, photodiodes, and photodetectors. However, the instability to humidity and light hinders its further development (S.H.Im, J.H.Heo, J.H.Noh, S.Il Seok, T.N. Mandal, Chemical Management for Colorful, Efficient, and Stable Inorganic–Organic Hybrid Nanostructured Solar Cells, Nano Lett .13 (2013) 1764–1769.). Mixed halogen perovskites with tunable emission wavelength, as one of the popular materials for photodiodes, are als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/68C07C209/84C07C211/03C09K11/06C09K11/66
CPCC07C209/68C07C209/84C09K11/06C09K11/664C07C211/03
Inventor 田玉玺华艳洪道程万苏舒
Owner NANJING UNIV
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