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Interface modification molecule applied to lead-based perovskite solar cell

A technology for solar cells and interface modification, applied in the field of solar cells, can solve problems such as single action of passivation molecules, and achieve the effect of promoting large-scale and commercialization process, reducing film defects, and reducing interface recombination loss.

Active Publication Date: 2022-07-29
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only passivate the defects of the perovskite film, and the role of the passivation molecule is relatively simple
Such molecules with single-site passivation abound, so the work is still very limited

Method used

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  • Interface modification molecule applied to lead-based perovskite solar cell
  • Interface modification molecule applied to lead-based perovskite solar cell
  • Interface modification molecule applied to lead-based perovskite solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Methods of making perovskite solar cells:

[0040] The difference from the comparative example is that the following operations need to be performed before step (4):

[0041] The modified layer solution with a concentration of 0.1 mg / mL was prepared by dissolving mercaptoethylamine iodine in isopropanol, and then spin-coated on the perovskite film under the conditions: 5000 rpm, 30 s. After spin-coating, annealing was performed at 100°C for 10 min to obtain a modified layer.

[0042] figure 1 In order to compare the current-voltage sweep curves of the perovskite solar cells in Example 1 and Example 1, the figure 1 It can be seen that the efficiency of the perovskite solar cell in Example 1 is significantly improved.

[0043] figure 2 In order to compare the defect maps of the light absorption layer of the perovskite solar cells in Example 1 and Example 1, it can be seen that the defect density of the perovskite thin film in Example 1 is significantly reduced.

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Embodiment 2

[0047] The difference from Example 1 is that the concentration of mercaptoethylamine iodine was changed to 0.75 mg / mL, and the rest remained unchanged.

[0048] Figure 5 The current-voltage positive sweep curve of the perovskite solar cell in Example 2 shows that the efficiency of the cell is 22.16%. Compared with the efficiency of the cell in the comparative example (20.51%), the device efficiency is significantly improved.

Embodiment 3

[0050] The difference from Example 1 is that the concentration of mercaptoethylamine iodine was changed to 1 mg / mL, and the rest remained unchanged.

[0051] Image 6 The current-voltage positive sweep curve of the perovskite solar cell in Example 3 shows that the efficiency of the cell is 21.85%. Compared with the efficiency of the cell in the comparative example (20.51%), the device efficiency is significantly improved.

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Abstract

The invention belongs to the technical field of solar cells, and particularly relates to an interface modification molecule applied to a lead-based perovskite solar cell. In order to solve the problems of poor humidity stability and low efficiency of perovskite solar energy, mercaptoethylamine iodine is used as a novel interface modification molecule and is dissolved in isopropanol to prepare a modification layer solution, and the modification layer solution is spin-coated on a perovskite layer, so that the film defects of the perovskite layer are effectively reduced, and the perovskite solar energy humidity stability is improved. According to the perovskite solar cell, the average carrier lifetime of the perovskite thin film is prolonged, the interface recombination loss of the device is reduced, and the energy level arrangement of the device is improved, so that the power conversion efficiency of the solar device is improved, the humidity stability of the device is also remarkably improved, and the large-scale and commercial process of the perovskite solar cell is promoted.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to an interface modification molecule applied to lead-based perovskite solar cells. Background technique [0002] In recent years, organic-inorganic hybrid perovskite solar cells (PSCs) have been widely used by researchers due to their high carrier mobility, long carrier diffusion length, tunable band gap, and high molar absorptivity. At the same time, as the main force of the third-generation solar cells, it is considered to be the most likely to replace the traditional silicon-based solar cells. Currently, the certified photoelectric conversion efficiency of single-cell perovskite solar cells is 25.7%. However, due to the large number of defects inside the film and the severe recombination at the interface, the device efficiency is seriously reduced. Therefore, how to further reduce film defects and reduce non-radiative recombination at the surface interface is very importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/25H01L51/46H01L51/42H01L51/48
CPCC07C323/25H10K71/00H10K30/30Y02E10/549
Inventor 毕欢侯文静韩高义
Owner SHANXI UNIV