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Preparation method of nanocrystal with core-shell-shell structure

A nanocrystal and shell structure technology, applied in the field of preparation of nanocrystals, can solve problems such as the inability to simultaneously solve the loss of silicon-based solar cells, and achieve the effects of reducing defects, improving conversion efficiency, and reducing specific surface area

Inactive Publication Date: 2014-01-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problem that the crystals synthesized by the current preparation method cannot solve the two main losses of silicon-based solar cells at the same time, thereby providing a method for preparing nanocrystals with a core-shell structure

Method used

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specific Embodiment approach 1

[0028] Specific embodiment one: the preparation method of the nanocrystal of a kind of core-shell shell structure in this embodiment is carried out according to the following steps:

[0029] 1. Preparation of NaYF with nuclear structure 4 :Er 3+ Nanocrystals:

[0030] 1) the ErCl 3 and YCl 3 Dissolve in the mixture of oleic acid and octadecene under greenhouse conditions, heat to 130°C-170°C at a speed of 600r / min-800r / min, and heat at a temperature of 130°C-170°C Keep it warm for 30min to 60min, then naturally cool to room temperature to obtain reaction solution 1; step 1 1) described ErCl 3 and YCl 3 The volume ratio of the total molar mass of oleic acid to oleic acid is 1mmol: (3mL~10mL); the ErCl described in Step 1 1) 3 and YCl 3 The volume ratio of the total molar amount of oleic acid to octadecene is 1mmol:(12mL~20mL); the volume ratio of oleic acid to octadecene in step 1) is 1:(2~4); in step 1) ErCl 3 and YCl 3 The molar ratio is 1:(2.3~19);

[0031] 2) Com...

specific Embodiment approach 2

[0043] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the ErCl described in step one 1) in step one 1) 3 and YCl 3 The volume ratio of the total molar amount of oleic acid to oleic acid is 1mmol: (5mL~8mL); the ErCl described in Step 1 1) 3 and YCl 3 The volume ratio of oleic acid to octadecene is 1mmol:(14mL~18mL); the volume ratio of oleic acid and octadecene in step 1) is 1:(2~4); in step 1) ErCl 3 and YCl 3 The molar ratio is 1:(5~10). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0044] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the NaOH and NH described in Step 1 2) 4 The molar ratio of F is 1: (1 ~ 3); the volume ratio of the molar amount of NaOH described in step 1 2) to methanol is 1 mmol: (2mL ~ 3mL); the NH 4 The volume ratio of the molar amount of F to methanol is 1mmol:(4mL-8mL); the volume ratio of the raw material solution 1 and the reaction solution 1 in step 1 2) is 1:(3-6). Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a nanocrystal with a core-shell-shell structure, relates to a preparation method of a nanocrystal, and is used for solving a technical problem that a crystal synthesized by a conventional preparation method cannot simultaneously solve two main loss of a silicon-based solar cell. The preparation method comprises the following steps: 1, preparing a NaYF4:Er<3+> nanocrystal with a core structure; 2, preparing a NaYF4:Er<3+>@NaYF4:Yb<3+>,Tb<3+> nanocrystal with a first layer of core-shell structure; and 3, preparing the NaYF4:Er<3+>@NaYF4:Yb<3+>,Tb<3+>@NaYF4 nanocrystal with the core-shell-shell structure. The preparation method can be applied in the solar cell field.

Description

technical field [0001] The invention relates to a preparation method of nano crystals. Background technique [0002] Solar energy has become an ideal clean energy due to its abundant reserves, no pollution, and renewable characteristics. A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. According to reports, the current annual solar energy usage is only equivalent to one ten-thousandth of the total energy delivered by the sun to the earth's surface. Although the world is vigorously developing solar energy applications, the current annual use of solar energy only accounts for 1% of the total global energy consumption, while traditional fuels account for 90%. Compared with many types of solar cells, silicon-based solar cells are currently used in the market. The mismatch between the solar emission spectrum and the absorption spectrum of silicon-based materials is a bottleneck that li...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/85C30B29/12C30B27/00B82Y20/00B82Y30/00B82Y40/00
Inventor 陈冠英邵韦邱海龙郝树伟杨春晖
Owner HARBIN INST OF TECH
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