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Cs3Cu2I5 ultraviolet detector and film preparation method thereof

A thin-film, spin-coating technology, used in semiconductor devices, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of low blue light luminous efficiency, easy decomposition, damage, etc., and achieve high fluorescence quantum efficiency and uniform thin film. Densification, effect of short annealing time

Active Publication Date: 2019-12-24
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

First of all, in terms of luminescence, most of the research on the high luminous efficiency and stable green light film materials of prehalogen perovskite film materials, but the blue light luminous efficiency of lead halide perovskite film materials is not high, so the research on blue light film materials is not enough. Second, lead halide perovskite is unstable in the air and easy to decompose; the last and most critical point, lead halide perovskite contains lead atoms that are harmful to the environment and human beings, thus limiting its practical application

Method used

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  • Cs3Cu2I5 ultraviolet detector and film preparation method thereof
  • Cs3Cu2I5 ultraviolet detector and film preparation method thereof
  • Cs3Cu2I5 ultraviolet detector and film preparation method thereof

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Embodiment 1

[0035] This embodiment provides a Cs 3 Cu 2 I 5 The preparation method of thin film, concrete steps are as follows:

[0036] 1) Dissolve CsI: 469 mg, CuI: 229 mg in a mixed solvent of DMF and DMSO, wherein DMF is 800 μL, DMSO is 200 μL, and heated and stirred at 60 ° C for 1 hour to completely dissolve the precursor solution;

[0037] 2) Ultrasonic cleaning of ITO glass with detergent, deionized water, acetone, alcohol and isopropanol for 30 minutes, followed by UV ozone treatment for 30 minutes before use;

[0038] 3) Use a pipette gun to take 60 μL of the fully dissolved precursor solution and drop it on the center of the ITO glass. After the precursor solution is completely spread out, start the spin coating. Minutes, spin-coating time 15 seconds, spin-coating speed of the second stage is 4000 rpm, spin-coating time is 30 seconds, and in the last 5 seconds of the second stage, 100 μL methyl acetate is quickly dropped in the center of ITO as an anti-solvent to assist crys...

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Abstract

The invention discloses a Cs3Cu2I5 ultraviolet detector and a film preparation method. A Cs3Cu2I5 precursor solution is applied to ITO glass by means of differential spin coating, and an anti-solventis added dropwise in the last 5 seconds of spin coating, and the differential speed is low first and then high. According to the film preparation technology, the annealing time needed is short, the annealing temperature is low, the film prepared is uniform and compact, the transmittance is high, the fluorescence quantum efficiency is high and reaches 76.1%, the film is kept stable in the air, andthe luminous efficiency is still kept at 76% after the film is stored in the air for 2 months.

Description

technical field [0001] The invention belongs to the technical field of lead-free perovskite thin films, in particular to the morphology control and preparation method of blue-light lead-free perovskite thin films, and in particular to a Cs 3 Cu 2 I 5 The method of film preparation. Background technique [0002] Lead halide perovskites are widely used in solar cells, LED lighting, lasers, photoelectric detection and other fields due to their excellent photoelectric properties, and are considered to be a class of promising materials. First of all, in terms of luminescence, most of the research on the high luminous efficiency and stable green light film materials of prehalogen perovskite film materials, but the blue light luminous efficiency of lead halide perovskite film materials is not high, so the research on blue light film materials is not enough. Secondly, lead halide perovskite is unstable in the air and easy to decompose; finally and the most critical point, lead ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCH01L31/18Y02P70/50
Inventor 唐孝生曾凡菊胡伟张孟叶怀宇张国旗
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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