CN-121974860-A - Phenazine ester derivative and preparation method and application thereof

Abstract

The invention relates to the technical field of perovskite solar cells, in particular to a phenazine ester derivative, a preparation method and application thereof. The molecular structural general formula of the phenazine ester derivative is shown as the specification, wherein L 1 is methyl, ethyl or isopropyl. According to the invention, the phenazine ester derivative with a specific structure is used as a passivation material, so that the photoelectric conversion efficiency of the battery is remarkably improved, and the problems of limited passivation effect, poor thermal stability, poor film forming property and insufficient compatibility with perovskite and charge transport layers of the conventional perovskite solar cell passivating agent are solved.

Inventors

• DING YE
• ZHANG YUESHUAI
• SONG RUOQI

Assignees

• 中茂绿能科技(西安)有限公司
• 中茂光伏科技集团有限公司

Dates

Publication Date

20260505

Application Date

20260206

Claims (8)

1. 1. The phenazine ester derivative is characterized by having a molecular structural formula as follows: ; wherein L 1 is methyl, ethyl or isopropyl.
2. 2. The phenazine ester derivative according to claim 1, wherein the phenazine ester derivative is any one of the following compounds: 。
3. 3. A process for the preparation of a phenazine ester derivative as claimed in any one of claims 1 to 2, comprising the steps of: Taking a compound shown in a formula 1 and a compound shown in a formula 2 as raw materials, reacting the compound shown in the formula 1 with NaH in a reaction solvent at 5-10 ℃, then adding the compound shown in the formula 2 at 5-10 ℃, performing substitution reaction at 20-25 ℃, and connecting an ester group on a phenazine N atom of the compound shown in the formula 1 to obtain a phenazine ester derivative shown in the formula 3; The synthetic route for phenazine ester derivatives is as follows: 。
4. 4. the method for producing a phenazine methode derivative according to claim 3, wherein the molar ratio of the compound represented by the formula 1 to the compound represented by the formula 2 is 1:2.5 to 2.6.
5. 5. The process for producing a phenazine methode derivative according to claim 3, wherein the molar ratio of the compound represented by the formula 1 to NaH is 1:3 to 3.1.
6. 6. A process for the preparation of a phenazine ester derivative as claimed in claim 3, wherein the reaction solvent is N, N-dimethylformamide.
7. 7. The method for producing a phenazine methode derivative according to claim 6, wherein the ratio of the compound represented by the formula 1 to the organic solvent is 1 mmol/1.8 mL-2 mL.
8. 8. Use of a phenazine ester derivative as passivation material for perovskite light absorbing layer for the preparation of perovskite solar cells, characterized in that the phenazine ester derivative is according to any one of claims 1-2.

Description

Phenazine ester derivative and preparation method and application thereof Technical Field The invention relates to the technical field of perovskite solar cells, in particular to a phenazine ester derivative, a preparation method and application thereof. Background Perovskite Solar Cells (PSCs) have become a research hotspot in the photovoltaic field by virtue of their low cost, high efficiency and ease of processing. Since development, the energy conversion efficiency of PSCs is continuously broken through, however, the perovskite light absorption layer is easy to generate grain boundary defects and point defects due to insufficient crystallization process, and is easy to be subjected to chemical degradation, organic component escape or ion migration under the action of high temperature, high humidity and high local electric field, the defects can accelerate charge recombination and obviously reduce the service life of carriers, and meanwhile, the interface defects and insufficient transport performance between the charge transport layer and the perovskite light absorption layer limit the efficiency improvement and long-term stability of the PSCs battery together, so that the perovskite light absorption layer becomes a key bottleneck for preventing the industrialization landing of the perovskite light absorption layer. Among them, defect passivation is one of the core means for improving perovskite film quality and improving device performance. For the mainstream n-i-p type perovskite solar cell, a Hole Transport Layer (HTL) is taken as one of the core functional layers, and plays an important role in extracting holes from the perovskite absorption layer and transmitting the holes to the electrode, and the performance of the hole transport layer directly influences the energy conversion efficiency and the stability of the cell. Currently, commonly used hole transport materials mainly include two major classes, molecular semiconductors and polymer semiconductors. The spiro-OMeTAD is a molecular semiconductor model material with wide application, has proper HOMO energy level, can obtain a certain hole concentration and conductivity through doping, has a glass transition temperature of less than 85 ℃, has higher diffusion coefficient of exogenous species in solid, and is easy to crystallize and crack when an amorphous film is heated, so that the battery has poor high-temperature stability. While a polymer semiconductor such as PTAA has longer charge transmission duration and better film mechanical property, the HOMO energy level is deeper, and the sufficient high conductivity is difficult to obtain through air oxidation doping, the conventional passivating agent is mostly a single functional material, or has limited passivation effect or poor compatibility with perovskite and a charge transport layer, so that the problem of charge recombination caused by defects can not be fundamentally solved, and the problem of interface suitability is easy to generate when the polymer semiconductor and the passivating agent are used cooperatively, so that the device performance is restricted. Disclosure of Invention The invention provides a phenazine ester derivative and a preparation method and application thereof, and aims to solve the problems of limited passivation effect, poor thermal stability, poor film forming property and insufficient compatibility with perovskite and a charge transport layer of the conventional perovskite solar cell passivating agent. The phenazine compound has a unique conjugated condensed ring structure, nitrogen atoms and ester groups in molecules can provide lone pair electrons, stable coordination effect can be formed with perovskite defect sites to realize efficient passivation, and meanwhile, the nitrogen atoms and benzene ring sites can carry out diversified substitution reaction, so that a structural basis is provided for optimizing the stability, film forming property and interface compatibility of materials. Therefore, the perovskite passivating agent provided by the invention has the advantages of high-efficiency passivation capability, excellent thermal stability, good film forming property and interface compatibility, and is important for promoting the industrialization process of perovskite solar cells. In order to achieve the above object, the technical scheme of the present invention is as follows. The first aspect of the invention provides a phenazine ester derivative, wherein the molecular structural general formula of the phenazine ester derivative is shown as follows: ; wherein L 1 is methyl, ethyl or isopropyl. Preferably, the phenazine methode derivative is any one of the following compounds: 。 According to a second aspect of the present invention, there is provided a process for the preparation of a phenazine methode derivative according to the first aspect, comprising the steps of: The compound shown in the formula 1 and the compound shown in the formula 2 are used as raw