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A method for improving the performance and stability of organic solar cells based on thiophene additives

A technology of solar cells and additives, applied in organic chemistry, circuits, photovoltaic power generation, etc., can solve the problems of improving device efficiency and achieve the effects of facilitating mass production, reducing recombination, high heat and light stability

Active Publication Date: 2020-12-01
WUHAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these additives can maintain the stability of the device to a certain extent, they have not achieved the same effect as DIO in terms of improving device efficiency, especially for systems containing fullerene (PCBM) acceptors, PCBM cannot be effectively Extracted from the polymer phase to form a good self-assembly ability

Method used

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  • A method for improving the performance and stability of organic solar cells based on thiophene additives
  • A method for improving the performance and stability of organic solar cells based on thiophene additives
  • A method for improving the performance and stability of organic solar cells based on thiophene additives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 (control group)

[0029] The first step is to prepare the organic active layer solution: use o-dichlorobenzene as the main solvent to prepare PTB7-Th:PC 71 BM (1:1.5, w / w) at a concentration of 25mg mL -1 (total concentration); add 3% DIO (v / v) to the prepared solution, then place it on a heating and stirring platform, heat and stir at 85° C. for 12 hours, and set aside.

[0030] The second step is to prepare ZnO precursor solution: Weigh 1.05g of zinc acetate dihydrate and 0.28g of ethanolamine and dissolve them in 10mL of 2-methoxyethanol, stir vigorously at room temperature for 12 hours, and set aside.

[0031] The third step is to clean the ITO glass substrate: the etched ITO glass is ultrasonically cleaned with distilled water, acetone and isopropanol for 10 minutes, and then dried with nitrogen, and then placed in a UV-ozone cleaning machine. 15min.

[0032] The fourth step, thin film spin-coating: first spin-coat the ZnO (electron transport layer)...

Embodiment 2

[0037] The first step is to prepare the organic active layer solution: use o-dichlorobenzene as the main solvent to prepare PTB7-Th:PC 71 BM (1:1.5, w / w) at a concentration of 25mg mL -1 (total concentration); add 1% DTH (v / v) to the prepared solution, then place it on a heating and stirring table, heat and stir at 85° C. for 12 hours, and set aside.

[0038]The second step is to clean the ITO glass substrate: the etched ITO glass is ultrasonically cleaned with distilled water, acetone and isopropanol for 10 minutes respectively, and after being blown dry with nitrogen, put it into a UV-ozone cleaning machine for processing 15min.

[0039] The third step, thin film spin coating: first spin coating ZnO (electron transport layer) layer, take the ZnO precursor solution 130 μ L that the second step in the embodiment 1 has prepared, spin coating 40min under the speed of 5000r / min, spin coating After that, it was annealed on a heating plate at 180°C for 30min. Then, move the drie...

Embodiment 3

[0043] The first step is to prepare the organic active layer solution: use o-dichlorobenzene as the main solvent to prepare PTB7-Th:PC 71 BM (1:1.5, w / w) at a concentration of 25mg mL -1 (total concentration); add 3% DTH (v / v) to the prepared solution, then place it on a heating and stirring table, heat and stir at 85° C. for 12 hours, and set aside.

[0044] The second, third and fourth steps are the same as in Example 2.

[0045] With the battery prepared above, in AM 1.5G (intensity is 100mW cm -2 ) irradiation, the photoelectric conversion efficiency of the organic solar cell obtained was 8.36%, slightly lower than the cell efficiency (8.65%) of adding DIO in Example 1, and the specific parameter values ​​are shown in Table 1.

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Abstract

The invention discloses a method for improving the performance and stability of organic solar batteries based on thiophene additives. The method is to add a certain proportion of thiophene additives when configuring the organic active layer solution. The general structural formula is as formula (I), wherein n=4-10; X is selected from any one of H, F, Cl, Br, I. The invention regulates the morphology of the donor-acceptor blend film by adding thiophene additives to the active layer solution, so that the active layer forms a suitable nano-phase-separated structure and orderly aggregation of the donor-acceptor, which is conducive to improving the exciton dissociation efficiency and photogenerated carrier mobility, thereby improving battery performance and lifetime. Therefore, organic solar cells based on thiophene compounds as solvent additives have the advantages of high photoelectric conversion efficiency, long life, simple preparation process and low cost.

Description

technical field [0001] The invention relates to a method for improving the performance and stability of organic solar cells based on thiophene additives, and belongs to the technical field of organic solar cells. Background technique [0002] Solar energy, as an inexhaustible green energy, has become the best way to solve the severe environmental and energy problems faced by today's society. Compared with traditional solar cells, organic solar cells (OSCs), as a new generation of photovoltaic technology, have attracted more and more researchers' attention due to their advantages of thinness, low cost, flexibility, and translucency. After more than ten years of hard work, OSCs based on fullerene systems have achieved device efficiencies as high as 12%, while OSCs based on non-fullerene systems have developed more rapidly, and the device efficiency has exceeded 13%. In these high-efficiency device structures, the regulation of the morphology of the active layer composed of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D333/08H01L51/48H01L51/46
CPCC07D333/08H10K30/00Y02E10/549
Inventor 肖生强高建宏詹春尤为
Owner WUHAN UNIV OF TECH
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