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Method for improving photoelectric conversion efficiency and stability of perovskite solar device

A technology of photoelectric conversion efficiency and perovskite solar energy, applied in the field of perovskite material energy band bending and improving charge extraction efficiency, can solve the problems that limit the development of perovskite batteries, energy band or energy level mismatch, and low battery charge recombination Effective charge capture and other issues, to achieve the effect of reducing surface potential, reducing charge recombination, and low cost

Pending Publication Date: 2021-06-18
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

However, perovskite materials have many inherent defects, and the interface between different materials in the device often has a phenomenon of energy band or energy level mismatch, which leads to a large number of charge recombination and inefficient charge capture inside the battery, limiting development of perovskite batteries

Method used

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  • Method for improving photoelectric conversion efficiency and stability of perovskite solar device
  • Method for improving photoelectric conversion efficiency and stability of perovskite solar device
  • Method for improving photoelectric conversion efficiency and stability of perovskite solar device

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Embodiment Construction

[0032] 1. Device Preparation

[0033] First, the etched FTO glass substrate was sequentially washed with detergent, deionized water, ethanol, and isopropanol, and dried with a nitrogen gun. Afterwards the base was coated with O 2 -plasma treatment for 10 minutes. TiO 2 The dense layer was first deposited on the substrate by atomic layer deposition (ALD), and then burned in air at 500°C for 30min. Spin-coating SnO on dense thin films 2 Precursor solution (SnCl 4 aqueous solution), the spin coating condition is 3000rpm, 30s, and then further heat treatment at 180°C for 30min to obtain dense TiO 2 / SnO 2 electron transport layer.

[0034] Secondly, accurately weigh 6.4mg MAI, 13.5mg FABr, 24.6mg CsI, 39.6mg PbBr 2 , 190.4mgFAI, 591.2mgPbI 2 , dissolved in 1mL mixed solvent, DMSO:DMF=4:1, v / v. In addition, the precursor also contains 0.35 equivalents of MACl. FA 0.9 Cs 0.07 MA 0.03 Pb(I 0.92 Br 0.08 ) 3 (3% excess PbI 2 ) The precursor solution was spin-coated at...

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Abstract

The invention belongs to a method for improving the photoelectric conversion efficiency and the stability of a device, and particularly relates to a method for reducing the defect density and the surface potential of an organic-inorganic hybrid perovskite film through pi-Pb < 2 + > interaction by using an N-doped fused ring passivator, bending the energy band of a perovskite material and improving the charge grabbing efficiency. In the process of preparing the organic-inorganic hybrid perovskite thin film, an additive is added into an anti-solvent, and the additive is attached and gathered on the surface of the formed organic-inorganic hybrid perovskite thin film. According to the invention, N-doped condensed ring organic small molecules are introduced into the perovskite thin film, so that the defects of the perovskite thin film are effectively passivated, and the stability of the thin film and corresponding devices is improved; and the adopted materials are low in cost and easy to implement in process.

Description

technical field [0001] The invention belongs to a method for improving the photoelectric conversion efficiency and stability of a perovskite battery device, and specifically relates to the use of an N heterofused ring passivator to pass through π-Pb 2+ The interaction reduces the defect concentration and surface potential of the organic-inorganic hybrid perovskite film, bends the energy band of the perovskite material, and improves the charge extraction efficiency. Background technique [0002] Metal halide perovskite materials have the characteristics of high light absorption coefficient, adjustable bandgap width, and long carrier diffusion length. This material has the photoelectric effect, converting light energy into electricity. The fabricated solar cell device is expected to become a reliable energy supply device. In recent years, a lot of research has been devoted to perovskite cells, increasing the photoelectric conversion efficiency from 3.8% in 2009 to 25.5% in 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48H01L51/42H01L51/44
CPCH10K71/311H10K30/10H10K30/88Y02E10/549
Inventor 周忠敏朱明哲李瑞韬张林宝文丽荣
Owner QINGDAO UNIV OF SCI & TECH
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