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A preparation method of quantum dots doped with holmium, ytterbium and magnesium and its application in perovskite batteries

A perovskite battery and quantum dot technology, applied in the field of solar cells, can solve problems such as poor conductivity and hinder electron transmission, and achieve the effects of enhancing luminous performance, expanding spectral response range, and improving conversion efficiency

Active Publication Date: 2020-05-05
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, NaYF 4 Poor electrical conductivity will hinder the transmission of electrons (Inorg. Chem., 2014, 53:8045)

Method used

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  • A preparation method of quantum dots doped with holmium, ytterbium and magnesium and its application in perovskite batteries
  • A preparation method of quantum dots doped with holmium, ytterbium and magnesium and its application in perovskite batteries
  • A preparation method of quantum dots doped with holmium, ytterbium and magnesium and its application in perovskite batteries

Examples

Experimental program
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Embodiment 1

[0039] A Ho 3+ -Yb 3+ -Mg 2+ doped TiO 2 The preparation method of upper quantum dot, it comprises the steps:

[0040] 1) Preparation of TiO2 precursor:

[0041] Mix 0.75 ml of n-tetrabutyl titanate and 0.225 ml of acetylacetone at room temperature for 1 hour, and then add 10 ml of iso-propyl alcohol to obtain solution A;

[0042] Add 0.045 ml of nitric acid and 0.105 ml of deionized water into 5 ml of isopropanol, mix and stir for 1 hour to obtain solution B;

[0043] Solution B was added dropwise to solution A and magnetically stirred for 6 hours to obtain TiO 2 precursor solution.

[0044] 2) Preparation of quantum dots: Ho(NO 3 ) 3 ·5H 2 O, Yb(NO 3 ) 3 ·5H 2 O and Mg(NO 3 ) 2 ·6H 2 O joins TiO 2 In the precursor solution, a mixed solution C is obtained, and the molar ratios of Ho and Ti, Yb and Ti, Mg and Ti in the mixed solution C are 0.5~1.5:100, 1~5:100, 1~4:100 respectively;

[0045] Dry the mixed solution C at 100°C for 12 hours (remove the solvent), ...

Embodiment 2

[0054] In this example, the mixed solution C prepared in Example 1 is used to participate in the preparation of the perovskite battery of this example, and the specific preparation method is as follows:

[0055] 1) FTO glass sheet treatment: clean the FTO glass sheet and treat it with ultraviolet light for 20 min to obtain a clean FTO glass sheet; the specific method of FTO glass cleaning is: etching (that is, using Zn powder and dilute hydrochloric acid FTO glass slices were etched), and the FTO glass slices were placed in conductive glass cleaning solution, acetone, and isopropanol in turn, and ultrasonically cleaned for 20 min each.

[0056] 2) Preparation of a dense layer: Add 0.072 ml of titanium acetylacetonate to 1 ml of n-butanol and mix evenly to obtain a dense layer precursor. Drop the dense layer precursor solution on the clean FTO glass sheet obtained in step 1), and mix at 3500 spin coating at a speed of 30 s per minute, and then annealed at 500ºC for 30-60 min to...

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Abstract

The invention relates to a method for preparing quantum dots doped with holmium, ytterbium and magnesium, which comprises the following steps: 1) preparation of a titanium dioxide precursor; 2) preparation of quantum dots: mixing Ho(NO 3 ) 3 ·5H 2 O, Yb(NO 3 ) 3 ·5H 2 O and Mg(NO 3 ) 2 ·6H 2 O is added to the titanium dioxide precursor solution to obtain a mixed solution C, which is dried and annealed to obtain quantum dots doped with holmium, ytterbium and magnesium titanium dioxide; quantum dots of holmium, ytterbium and magnesium doped titanium dioxide can be used as electron transport materials for the preparation of calcium In the titanium battery, the prepared perovskite battery can convert near-infrared light into visible light with high conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a Ho 3+ -Yb 3+ -Mg 2+ doped TiO 2 Preparation of quantum dots and their application in perovskite batteries. Background technique [0002] In recent years, perovskite solar cells have become a research hotspot in the field of solar cells because of their high efficiency, low cost, and simple preparation methods. The conversion efficiency of perovskite cells has increased rapidly, reaching 22.1% by 2017 (Science, 2017, 356:1376). However, perovskite solar cells can only absorb a small part of the solar spectrum (280–800 nm) and cannot absorb near-infrared light, and the energy loss of incident light is large, which hinders further improvement of cell efficiency. One way to solve this problem is to use up-conversion luminescent materials to convert near-infrared light into visible light that the battery can absorb, thereby improving the conversion efficiency of the battery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K30/151Y02E10/549
Inventor 张振龙毛艳丽石文佳
Owner HENAN UNIVERSITY
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