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A kind of composite carbon counter electrode material and its preparation method and application

A technology of electrode material and composite carbon, which is applied in the direction of circuits, photovoltaic power generation, electrical components, etc., can solve the problems that the photovoltaic performance is difficult to continue to improve, and the interface contact performance between carbon and perovskite deteriorates, so as to achieve improved photovoltaic performance and repeatable High performance and good electrical conductivity

Active Publication Date: 2020-04-10
YUNNAN UNIV
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  • Claims
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Problems solved by technology

However, the poor interfacial contact between carbon and perovskite makes it difficult to continue to improve the photovoltaic performance. In order to solve this problem, many researchers have improved the quality and interfacial contact characteristics of carbon electrodes by adding polymers and non-polar solvents to carbon paste. However, the polymer may detach from the carbon film to form holes during high-temperature annealing, resulting in poor interfacial contact between carbon and perovskite.

Method used

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  • A kind of composite carbon counter electrode material and its preparation method and application
  • A kind of composite carbon counter electrode material and its preparation method and application
  • A kind of composite carbon counter electrode material and its preparation method and application

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preparation example Construction

[0029] The preparation method of composite carbon counter electrode material of the present invention comprises the following steps:

[0030] A. Weigh each raw material according to the formula ratio, and obtain material a after mixing evenly for subsequent use;

[0031] B. Add a solvent that is 2 to 3.5 times the volume of material a to material a, grind at room temperature for 6 to 24 hours to obtain material b;

[0032] C. Evaporate the material b to remove the solvent to obtain the target compound carbon counter electrode material.

[0033] Described solvent is terpineol and / or dehydrated alcohol.

[0034] The evaporation described in step C is at a temperature of 40-70° C. through rotary evaporation or heating and stirring evaporation.

[0035] The application of the composite carbon counter electrode material in the present invention is the application of the composite carbon counter electrode material in preparing a composite carbon counter electrode film.

[0036] T...

Embodiment 1

[0039] A. Weigh graphite powder 4g and carbon black 1g and mix in the ball mill jar;

[0040] B. Add 12.5ml of terpineol and 20ml of absolute ethanol, grind it in a planetary ball mill for 24 hours and take it out;

[0041] C. After the grinding is completed, heat and stir at 40°C to evaporate and remove excess ethanol to obtain a carbon slurry without liquid metal addition;

[0042] D. The prepared carbon paste was printed on the glass and the conductive glass substrate covered with FTO by screen printing technology, and then dried on a hot plate at 70°C, and then annealed at 400°C 40min.

Embodiment 2

[0044] A. Weigh 4g of graphite powder and 1g of carbon black, then weigh 35mg of gallium-based liquid metal, and mix them together in a ball mill jar;

[0045] B. Add 12.5ml of terpineol and 20ml of absolute ethanol, grind it in a planetary ball mill for 24 hours and take it out;

[0046] C. After grinding, remove excess ethanol by rotary evaporation at 40°C to obtain a composite carbon slurry containing 0.6% liquid metal mass fraction;

[0047] D. The prepared carbon paste was printed on the glass and the conductive glass substrate covered with FTO by screen printing technology, and then dried on a hot plate at 70°C, and then annealed at 400°C 40min.

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Abstract

The invention discloses a composite carbon counter electrode material, a preparation method and application thereof. The graphite-liquid metal composite carbon counter electrode material includes raw graphite powder and conductive carbon black, and the mass ratio of graphite powder and conductive carbon black is 2-6:1. The present invention uses screen printing to print the prepared graphite-liquid metal composite carbon counter electrode material on a substrate such as glass, and anneals at 200-600°C to form a thin film; the present invention utilizes the conductivity and room temperature fluidity of liquid metal , make it in good contact with the substrate, improve the interface conductivity of the electrode, and at the same time use the high-temperature volume micro-change of the liquid metal to eliminate the stress change generated during the annealing process of the carbon-based electrode. The invention optimizes the interfacial contact characteristics of the carbon electrode through liquid metal compounding to reduce its sheet resistance, and is used for the counter electrode of a fully printed perovskite solar cell, which can improve the photovoltaic performance of the device.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, further belongs to the technical field of solar cells, and specifically relates to a composite carbon counter electrode material and its preparation method and application. Background technique [0002] Organic-inorganic hybrid perovskite solar cells belong to the third generation of new solar cells. Due to their low cost, wet method preparation, and high photoelectric conversion efficiency, academia and industry have paid great attention in recent years. The photoelectric conversion efficiency From the initially reported 3.8% in 2009 to 22.1% in 2016, the industry has a good prospect. [0003] The counter electrode in perovskite solar cells mainly accepts the holes generated after the separation of perovskite photogenerated excitons, which requires the work function of the selected counter electrode material to match the highest occupied state (HOMO) energy level of the perovskite mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/04H01L51/44
CPCH01B1/04H10K30/81Y02E10/549
Inventor 柳清菊张裕敏赵建红张瑾朱忠其
Owner YUNNAN UNIV
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