Perovskite solar cell additive based on cyanopyridine ionic liquid and applications thereof

A technology of solar cells and ionic liquids, applied in circuits, photovoltaic power generation, electrical components, etc., to achieve the effects of good fluorescence properties, large grain size, improved photoelectric efficiency and device stability

Active Publication Date: 2020-02-28
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is still a great challenge to find a functionalized ionic liquid from the aspect of molecular design that can more effectively passivate the defects of the perovskite film, and at the same time improve the stability and efficiency of the film and device.

Method used

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  • Perovskite solar cell additive based on cyanopyridine ionic liquid and applications thereof
  • Perovskite solar cell additive based on cyanopyridine ionic liquid and applications thereof
  • Perovskite solar cell additive based on cyanopyridine ionic liquid and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The present embodiment provides a perovskite solar cell additive based on cyanopyridine-based ionic liquid, and its chemical structural formula is as follows:

[0039] Concrete synthetic steps are:

[0040] Add 20mL ethanol, 20mmol and 22mmol methyl iodide, under the protection of an ice-water bath and an inert gas, stirred and reacted for 5 hours, removed ethanol by rotary evaporation, and washed 3 to 5 times with anhydrous ether to obtain Yield 83% (as figure 1 shown); NMR data: 1 HNMR (400 MHz, d6-DMSO): 9.46 (m, 2H), 8.75 (m, 2H), 4.72 (m, 3H).

Embodiment 2

[0042] The present embodiment provides a perovskite solar cell additive based on cyanopyridine-based ionic liquid, and its chemical structural formula is as follows:

[0043] Concrete synthetic steps are:

[0044] Add 20mL ethanol, 20mmol and 22mmol iodopropane, under the protection of an ice-water bath and an inert gas, reacted for 5 hours, removed ethanol by rotary evaporation, and washed 3 to 5 times with anhydrous ether to obtain Yield 78%; NMR data: 1 HNMR (400MHz, d6-DMSO): 9.46 (m, 2H), 8.75 (m, 2H), 4.73 (m, 2H), 1.93 (m, 2H), 0.92 (m, 3H).

Embodiment 3

[0046] The present embodiment provides a perovskite solar cell additive based on cyanopyridine-based ionic liquid, and its chemical structural formula is as follows:

[0047] Concrete synthetic steps are:

[0048] Add 20mL ethanol, 20mmol And 22mmol iodooctane, in an ice-water bath, under inert gas protection, after reacting for 12 hours, remove ethanol through rotary evaporation, and then wash 3-5 times with anhydrous ether to obtain Yield 68%. NMR data: 1 HNMR(400MHz,d6-DMSO):9.46(m,2H),8.74(m,2H),4.73(m,2H),1.93(m,2H),1.33(m,10H),0.92(m,3H) .

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Abstract

The invention relates to a perovskite solar cell additive based on a cyanopyridine ionic liquid and applications thereof. The chemical structural formula of the additive is represented in the description, in the formula, n represents an integer from 0 to 9; and Z represents Br, I, Cl, BF4, PF6, or TFSI. A special chemical structure is designed so that a cyano group is connected to a pyridine ring;due to the strong polarity of the cyano group, the morphology of a perovskite film can be controlled during the growth process, the prepared grains have a greater size; at the same time, due to the synergistic effect between the cyano group and pyridine cations, the internal defects in the perovskite film are reduced; and the prepared perovskite film has a very good fluorescent property.

Description

technical field [0001] The invention belongs to the field of solar cell additives, and relates to an additive for perovskite solar cells, in particular to an additive for perovskite solar cells based on cyanopyridine ionic liquids and an application thereof. Background technique [0002] In the past decade, the high light absorption coefficient (10 5 cm -1 ), large electron / hole diffusion length (up to 1 μm), easy adjustment of bandgap (1-2.5eV), small exciton binding energy (about 40meV), low-cost solution processing and other characteristics, making calcium Titanium solar cells have been developed rapidly. At present, the photoelectric conversion efficiency of perovskite solar cells has exceeded 22%, which has attracted extensive attention from various countries and solar cell fields. [0003] During the solution preparation process of perovskite cells, the migration of some halide ions and the rapid crystallization of thin films will cause problems such as vacancy and ...

Claims

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Application Information

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IPC IPC(8): C07D213/57H01L51/00H01L51/42
CPCC07D213/57H10K71/12H10K30/151Y02E10/549
Inventor 赵杰邹贵付姜聪慧李龙飞
Owner SUZHOU UNIV
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