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Lead sulfide quantum dot solar cell and preparation method thereof

A technology of solar cells and quantum dots, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as cumbersome processes, low ligand exchange efficiency, and material consumption, so as to simplify the operation process, improve ligand exchange efficiency, The effect of reducing the consumption of materials

Pending Publication Date: 2021-05-11
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The preparation of each layer of the commonly used layer-by-layer spin coating method includes steps such as quantum dot thin layer spin coating, ligand solution spin coating, and excessive ligand cleaning, which need to be repeated many times. This method has cumbersome processes and low ligand exchange efficiency. Defects such as high and large material consumption

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  • Lead sulfide quantum dot solar cell and preparation method thereof
  • Lead sulfide quantum dot solar cell and preparation method thereof

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preparation example Construction

[0034] The invention provides a lead sulfide quantum dot solar cell and a preparation method thereof. A light-absorbing layer of a quantum dot solar cell is prepared by a one-step method to obtain a high-performance lead sulfide quantum dot solar cell. The material PbS of the light-absorbing layer of the lead sulfide quantum dot solar cell provided by the present invention is treated with a solution containing the second ligand in a one-step method to replace the first ligand originally attached to the PbS, effectively removing the long-chain ligand in the light-absorbing layer, The charge transport performance of the light-absorbing layer is increased, and the charge recombination effect of the light-absorbing layer is reduced, thereby improving the photoelectric conversion efficiency of the battery. The lead sulfide quantum dot battery provided by the present invention has the characteristics of excellent efficiency, good stability, and easy preparation, and compared with th...

Embodiment 1

[0044] 1. Preparation of lead sulfide with first ligand: 6 mmol of lead oxide PbO and 15 mmol of oleic acid OA were dissolved in 50 mL of 1-octadecene. The mixed solution was evacuated for 20 minutes, then heated to 100°C and kept for 2 hours, and kept stirring during the process. The lead precursor, lead oleate, was prepared and cooled under nitrogen flow. 630 μl of hexamethyldisilazane TMS was added to 10 mL of 1-octadecene at a temperature of 80° C. to prepare a sulfur precursor, and the temperature of the lead oleate solution dropped to 90° C. at this time. When the temperature of the lead oleate is 85°C, inject the sulfur precursor solution into it quickly, and keep stirring during the process. The preparation of lead sulfide (lead sulfide quantum dot original solution) with long-chain oleic acid ligands was completed.

[0045] 2. Ligand exchange to obtain lead sulfide with a second ligand: 20 mL of dimethylformamide DMF, 0.1 mol / L lead iodide PbI 2 , 0.04mol / L lead br...

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Abstract

The invention provides a lead sulfide quantum dot solar cell and a preparation method thereof. The preparation method comprises the following steps: S1, preparing an electron transport layer on a conductive glass substrate; S2, preparing a quantum dot light absorption layer on the electron transport layer by adopting a one-step spin-coating method; S3, preparing a hole transport layer on the quantum dot light absorption layer by adopting a spin-coating method; and S4, depositing a metal electrode on the hole transport layer by adopting an evaporation method, and preparing the light absorption layer of the quantum dot solar cell by adopting a one-step method so as to obtain the high-performance lead sulfide quantum dot solar cell.

Description

【Technical field】 [0001] The invention relates to the technical field of solar cell preparation, in particular to a lead sulfide quantum dot solar cell and a preparation method thereof. 【Background technique】 [0002] Quantum dot solar cells have the advantages of adjustable band gap, multi-exciton effect, and good chemical stability, and have great development potential. In order to improve the performance of the battery, the surface treatment of quantum dots is generally carried out by ligand exchange in the preparation process of quantum dot solar cells. The preparation of each layer of the commonly used layer-by-layer spin-coating method includes steps such as quantum dot thin-layer spin-coating, ligand solution spin-coating, and excessive ligand cleaning, which need to be repeated many times. High and large material consumption and other defects. [0003] Therefore, it is necessary to study a lead sulfide quantum dot solar cell and its preparation method to address th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48H01L51/42
CPCH10K71/12H10K30/00Y02E10/549
Inventor 邢美波魏玉瑶王丹丹王瑞祥
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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