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Bulk heterojunction perovskite thin film and its preparation method and solar cell

A solar cell and bulk heterojunction technology, applied in the field of solar cells, can solve problems such as being unfavorable for large-scale preparation and yield control, increasing the difficulty of perovskite thin film preparation, and thin film charge recombination, so as to avoid high temperature sintering process, Strong electron extraction ability, reducing the effect of charge recombination

Active Publication Date: 2019-01-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there are many pinhole defects in the prepared film, it is easy to cause the recombination of charges in the film, which seriously affects the performance of the film.
This not only increases the difficulty of preparing perovskite thin films, but also is not conducive to large-scale preparation and yield control.

Method used

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  • Bulk heterojunction perovskite thin film and its preparation method and solar cell
  • Bulk heterojunction perovskite thin film and its preparation method and solar cell

Examples

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[0027] The invention relates to a bulk heterojunction perovskite film, a corresponding perovskite solar cell and a preparation method thereof. By coating the prepared perovskite precursor solution and perovskite / electron acceptor material dispersion on the substrate, a bulk heterojunction precursor film is formed, and by crystallizing the bulk heterojunction precursor film, The bulk heterojunction perovskite thin film of the present invention is obtained. The bulk heterojunction film of the present invention adopts perovskite material as the electron donor material, and the electron acceptor material is located at the grain boundary of the perovskite polycrystalline film, and a dense perovskite film layer is formed on the surface of the bulk heterojunction , compared with the traditional perovskite film, the preparation method is simpler, and the film quality is easier to control, which overcomes the problems of complex traditional structure and process and higher requirements...

Embodiment 1

[0066] Synthesis of TiO by Hydrothermal Method 2 Nanocrystalline: Add 150mL tetrabutyl titanate into a glass reactor filled with 0.1moL / L dilute nitric acid solution (1000mL) under vigorous stirring, hydrolyze to form a white precipitate, then heat the reactor to 120°C and keep stirring Incubate for 8 hours to degumming and concentrate. The resulting sol was transferred into a titanium autoclave and subjected to hydrothermal treatment at 260 °C for 12 hours to obtain TiO 2 Nanocrystalline. Obtained TiO 2 The particle size of the nanocrystals is about 20nm;

[0067] (1) Preparation of perovskite / electron acceptor material dispersion. First prepare TiO 2 DMF dispersion: the hydrothermally synthesized TiO 2 The nanocrystals were washed with deionized water, ethanol and DMF to remove impurities, and then dispersed in DMF to form a dispersion liquid for later use. Then, the PbI 2 , MAI and DMSO were dissolved in DMF at a ratio of 1:1:1 and stirred thoroughly to obtain a per...

Embodiment 2

[0074] (1) Preparation of perovskite / electron acceptor material dispersion. First prepare TiO 2 DMF dispersion: the hydrothermally synthesized TiO 2 The nanocrystals were washed with deionized water, ethanol and DMF to remove impurities, and then dispersed in DMF to form a dispersion liquid for later use. Then, the PbI 2 , MAI and DMSO were dissolved in DMF at a ratio of 1:1:1 and stirred thoroughly to obtain a perovskite precursor solution (MAPbI 3 ), and then mix the perovskite precursor solution with TiO 2 DMF dispersion in a certain proportion (MAPbI 3 with TiO 2 Molar ratio is 10:1) mixed to obtain MAPbI 3 / TiO 2 Nanocrystalline precursor dispersion;

[0075] (2) Cleaning of the conductive substrate. With embodiment 1;

[0076] (3) Preparation of hole blocking layer. With embodiment 1;

[0077] (4) Preparation of perovskite heterojunction active layer. Dropwise addition of MAPbI on the substrate of FTO / hole blocking layer 3 / TiO 2 Nanocrystalline precursor ...

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Abstract

The present invention relates to a bulk heterojunction perovskite thin film, a preparation method thereof and a solar cell. The bulk heterojunction perovskite thin film includes: a bulk heterojunction layer, and the bulk heterojunction layer includes an electron donor material The perovskite polycrystalline film, and the electron acceptor material located at the grain boundary of the perovskite polycrystalline film; and the perovskite film layer located on the surface of the bulk heterojunction layer. When the bulk heterojunction perovskite film of the present invention is applied to perovskite solar cells, it can replace the existing mesoporous electron transport layer and perovskite light-absorbing layer, thereby simplifying the structure of the cell and avoiding independent The high-temperature sintering process required in the preparation of the mesoporous layer is suitable for the preparation of high-efficiency flexible perovskite solar cells on plastic substrates.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a method for preparing a thin film for a solar cell, and more specifically, to a bulk heterojunction perovskite thin film, a corresponding perovskite solar cell and a preparation method thereof. Background technique [0002] With the development of human society, the demand for energy is increasing day by day. As a clean and non-polluting energy source, solar energy has received extensive attention and in-depth research at home and abroad. Solar cells based on organic-inorganic hybrid perovskite films are a new type of solar cells developed in recent years, and their advantages are very prominent: 1. The preparation process of organic-inorganic hybrid perovskite materials is simple and the cost is low; 2. It has an adjustable band gap; 3. Balanced electron-hole mobility, high quantum luminous efficiency and large defect tolerance; 4. It can be made into a semi-transparent ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K30/30H10K30/35H10K30/353Y02E10/549
Inventor 杨松旺邵君刘岩
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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