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Application of organic phosphonium salt molecule in perovskite solar cell and preparation method of device of organic phosphonium salt molecule

A technology of solar cells and phosphonium salts, which is applied in the field of compound preparation to achieve the effects of passivating interface defects, inhibiting non-radiative recombination, and improving power conversion efficiency and stability

Active Publication Date: 2021-09-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this molecular design strategy has rarely been reported in perovskite solar cells

Method used

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  • Application of organic phosphonium salt molecule in perovskite solar cell and preparation method of device of organic phosphonium salt molecule
  • Application of organic phosphonium salt molecule in perovskite solar cell and preparation method of device of organic phosphonium salt molecule
  • Application of organic phosphonium salt molecule in perovskite solar cell and preparation method of device of organic phosphonium salt molecule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare a positive perovskite solar cell modified by organic phosphonium salt molecule A, the specific preparation method is as follows:

[0048] (1) The ITO conductive substrate is ultrasonically cleaned with detergent, deionized water, acetone, and absolute ethanol in sequence, then dried with nitrogen, treated with ultraviolet ozone for 15 minutes, and cooled for later use;

[0049] (2) To 250 μL of SnO with a mass fraction of 15% 2 Add 750 μL deionized water to the nanoparticle dispersion, filter through 0.22 μm PVDF, take 40 μL dropwise onto the ITO conductive substrate treated in step (1), spin-coat at 3000 rpm for 30 s, and then anneal at 150 °C 30min, the electron transport layer was prepared, and then the electron transport layer was subjected to ultraviolet ozone irradiation treatment for 15min to prepare the electron transport layer;

[0050] (3) FAI (248.16mg), CsI (19.73mg), RbI (6.58mg), PbI2 (682.73mg), PbBr 2 (8.53mg), PbCl2 (12.74mg) and MACl (35mg) w...

Embodiment 2

[0071] Prepare a positive perovskite solar cell modified with organic phosphonium salt molecules B, the specific preparation method is as follows:

[0072] The difference from Example 1 is that in step (4), the organic phosphonium onium salt molecule A is replaced by the organic phosphonium onium salt molecule B.

[0073]

[0074] Figure 6 It is the current density-voltage graph of the perovskite solar cell in Example 2, and the photovoltaic parameters of the cell are obtained according to the graph, and the results are shown in Table 2.

[0075] The photovoltaic parameter of perovskite solar cell in the embodiment 2 of table 2

[0076]

[0077] Depend on Figure 6 It can be seen from Table 2 that the open circuit voltage of the perovskite solar cell in Example 2 is improved, and the power conversion efficiency is increased from 20.61% in the comparative example to 21.28%.

Embodiment 3

[0079] A positive perovskite solar cell modified with organic phosphonium salt molecules C is prepared, and the specific preparation method is as follows:

[0080] The difference from Example 1 is that in step (4), the organic phosphonium onium salt molecule A is replaced by the organic phosphonium onium salt molecule C.

[0081]

[0082] Figure 7 It is the current density-voltage curve graph of the perovskite solar cell in Example 3, and the photovoltaic parameters of the cell are obtained according to the graph, and the results are shown in Table 3.

[0083] The photovoltaic parameter of perovskite solar cell in the embodiment 3 of table 3

[0084]

[0085] Depend on Figure 7 It can be seen from Table 3 that the open circuit voltage and fill factor of the perovskite solar cell in Example 3 are improved, and the power conversion efficiency is increased from 20.61% in the comparative example to 21.28%.

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Abstract

The invention relates to application of an organic phosphonium salt molecule in a perovskite solar cell and a preparation method of a device of the organic phosphonium salt molecule, and belongs to the technical field of perovskite solar cells. Zwitterions in the organic phosphonium salt molecules and a perovskite thin film have chemical effects, interface defects of the perovskite thin film are effectively passivated, the service life of carriers of the perovskite thin film is prolonged, non-radiative recombination of interface carriers is inhibited, and therefore the power conversion efficiency and stability of the device are improved at the same time, and controllable preparation of the efficient and stable perovskite solar cell is realized.

Description

technical field [0001] The invention belongs to the technical field of compound preparation, and relates to the application of organic phosphonium salt molecules in perovskite solar cells and the preparation method of devices. Background technique [0002] Perovskite solar cells (PSCs) have become the development trend due to their advantages such as low cost, adjustable band gap, long carrier diffusion length, high molar absorptivity, solution processable, flexible preparation, and high power conversion efficiency (PCE). The fastest solar cell technology, comparable to the efficiency of monocrystalline silicon solar cells. So far, the highest efficiency certified by the US National Renewable Energy Laboratory (NREL) has reached 25.5%. However, the poor long-term operational stability of PSCs seriously restricts their large-scale commercial applications. Numerous studies have shown that the bulk and interfacial nonradiative recombination loss of perovskite light-absorbing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/572C07F9/06C07F9/59C07F9/54H01L51/42H01L51/46H01L51/48
CPCC07F9/572C07F9/06C07F9/59C07F9/5407C07F9/5435H10K71/12H10K85/30H10K30/00Y02E10/549
Inventor 陈江照何冬梅
Owner CHONGQING UNIV
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