P-doped small organic molecules as well as preparation method and application thereof

A small molecule and organic technology, applied in the field of p-doped organic small molecules and their preparation, can solve the problems of reducing the photoelectric conversion efficiency of batteries, reducing the open circuit voltage of perovskite solar cells, energy loss, etc., and achieving good application prospects and defects. Less, good crystallinity effect

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

AI Technical Summary

Problems solved by technology

The mismatch between the energy level of perovskite and the energy level of the transport layer is another important factor affecting the performance of perovskite solar cells, which will cause energy loss, which is reflected in the decrease of open circuit voltage of perovskite solar cells, thereby reducing the photoelectric conversion of cells Efficiency (PCE)

Method used

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  • P-doped small organic molecules as well as preparation method and application thereof
  • P-doped small organic molecules as well as preparation method and application thereof
  • P-doped small organic molecules as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 2mg of Spiro-DTP-TPA material was dissolved in 2mL of chlorobenzene to obtain Spiro-DTP-TPA in chlorobenzene solution. Spin-coat 70 μL of this solution on the cleaned conductive glass, and then anneal at 150 °C for 10 minutes to obtain a hole transport layer loaded with Spiro-DTP-TPA, and then apply the hole transport layer to perovskite solar cells, The active layer uses MAPbI 3 (MA stands for methylammonia, Pb is lead, I is iodine), the electron transport layer is PCBM, and the battery area is 0.09cm 2 . The J-V curve ( Figure 7 shown in curve a), to obtain the open circuit photovoltage (V oc ) is 973mV, short-circuit photocurrent (J sc ) is 19.30mA cm -2 , the fill factor (FF) is 0.61, and the PCE is 11.40%.

Embodiment 2

[0042] 2mg of Spiro-DTP-DPA material was dissolved in 2mL of chlorobenzene to obtain a solution of Spiro-DTP-DPA in chlorobenzene. Spin-coat 70 μL of this solution on the cleaned conductive glass, and then anneal at 150 °C for 10 minutes to obtain a hole transport layer loaded with Spiro-DTP-DPA, and then apply the hole transport layer in perovskite solar cells, The active layer uses MAPbI 3 (MA stands for methylammonia, Pb is lead, I is iodine), the electron transport layer is PCBM, and the battery area is 0.09cm 2 . The J-V curve ( Figure 7 shown in curve b), get V oc 948mV, J sc 16.02mAcm -2 , FF is 0.57, and PCE is 8.71%.

Embodiment 3

[0044] 10 mg of Spiro-DTP-TPA material was dissolved in 1 mL of chlorobenzene to obtain a chlorobenzene solution of Spiro-DTP-DPA. Take 70 μL of this solution and spin-coat on the perovskite film to obtain a hole transport layer loaded with Spiro-DTP-DPA, and then use a metal evaporator to evaporate 50 nm of gold as a counter electrode, in which the active layer uses MAPbI 3 (MA stands for methylammonia, Pb is lead, I is iodine), and the electron transport layer is SnO 2 , the cell area is 0.09cm 2 . The J-V curve ( Figure 8 shown), get V oc 832mV, J sc 21.82mA cm -2 , FF is 0.72, and PCE is 13.12%.

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Abstract

The invention discloses two p-doped small organic molecules as well as a preparation method and application thereof. The Spiro-DTP-TPA and the Spiro-DTP-DPA are respectively prepared by using the Suzuki coupling reaction and the Buchward-Hartwig reaction. The two organic materials have high hole mobility and strong interaction with Pb. The material is applied to anti-solvent engineering of the perovskite solar cell, the crystallization of perovskite is optimized, the defects of the surface and the grain boundary of a perovskite thin film are passivated, meanwhile, p-doped perovskite realizes energy band bending, finally, the performance and the stability of the cell are greatly improved, the photoelectric conversion efficiency of the perovskite solar cell is improved to 20.21% from the original 17.22%, and meanwhile, after the p-doped battery is stored for 1080 hours under the conditions that the relative humidity is 30-40% and the temperature is 20-35 DEG C, the p-doped battery can still maintain 94% of initial efficiency, and the efficiency of an original device is reduced to 49% of the initial efficiency.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a p-doped organic small molecule and its preparation method and application. Background technique [0002] In recent years, with the increasingly prominent energy crisis, the development of clean energy is undoubtedly one of the effective ways to alleviate this problem. Perovskite solar cells have many unique advantages and are considered to be a very promising photoelectric conversion device. Although perovskite has advantages such as excellent light absorption coefficient, tunable direct bandgap, low binding energy, and high carrier mobility, a large number of defects are formed at the surface and grain boundaries of the film during its crystallization process, and these defects will It becomes the recombination center of electrons and holes, which reduces the performance of the battery. At the same time, it also becomes the decomposition reaction center of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D495/20H01L51/46H01L51/42
CPCC07D495/20H10K85/636H10K85/631H10K85/657H10K30/30Y02E10/549
Inventor 王忠胜谭玉林
Owner FUDAN UNIV
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