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Perovskite solar cell and preparation method thereof

A solar cell, perovskite-type technology, applied in the field of solar cells, can solve the problem that the perovskite grain nucleation and film growth direction are difficult to control, the recombination probability of electrons and holes is high, and the carrier diffusion length is reduced. It can improve the photoelectric conversion efficiency and stability, passivate surface defects, and improve the film morphology.

Active Publication Date: 2016-05-25
CHINA LUCKY FILM CORP
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AI Technical Summary

Problems solved by technology

[0005] However, for planar perovskite solar cells, there are still two problems: (1) The electrode modification layer usually uses electron transport materials (such as TiO 2 , ZnO) or hole transport material (MoO 3 , Spiro-OMeTAD), in this way, the probability of recombination of electrons and holes generated in the perovskite light-absorbing layer is high, which affects the photoelectric performance of the battery; (2) The perovskite light-absorbing layer is directly deposited on the electrode modification by liquid phase method layer surface, due to the perovskite solution CH 3 NH 3 PB 3 In the process of film formation, it self-assembles into nano-scale perovskite micro-grains rapidly. It is difficult to control the nucleation of perovskite grains and the growth direction of the film layer, which reduces the diffusion length of carriers and seriously recombines electrons and holes.

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  • Perovskite solar cell and preparation method thereof
  • Perovskite solar cell and preparation method thereof
  • Perovskite solar cell and preparation method thereof

Examples

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preparation example Construction

[0037] figure 1 In the perovskite-type solar cell shown, before the perovskite light-absorbing layer is prepared by the liquid phase method, the electron transport layer is surface-modified to form a liquid crystal layer, and the preparation method includes the following steps:

[0038] 1) Cleaning the transparent electrode, etching the electrode pattern and then cleaning, drying, and UV / ozone treatment;

[0039] 2) Prepare an electron transport layer on the transparent electrode;

[0040] 3) Prepare a liquid crystal layer on the surface of the electron transport layer;

[0041] 4) On the surface of the liquid crystal layer, grow a perovskite light-absorbing layer;

[0042] 5) Deposit a hole transport layer on the surface of the perovskite light-absorbing layer;

[0043] 6) Prepare a counter electrode on the hole transport layer.

[0044] figure 2 In the perovskite-type solar cell shown, before the perovskite light-absorbing layer is prepared by the liquid phase method, the hole transpo...

Embodiment 1

[0066] The first step is to prepare transparent electrodes:

[0067] The ITO conductive glass was etched into electrode patterns with concentrated hydrochloric acid, and then washed with detergent, deionized water, absolute ethanol, acetone, and isopropanol in order of ultrasonic cleaning for 10 minutes, then dried with nitrogen, and treated with ultraviolet / ozone for 20 minutes.

[0068] The second step is to prepare the electron transport layer:

[0069] The precursor solution of nano-ZnO particle colloid was deposited on the surface of the transparent ITO electrode by spin coating, and then placed in a muffle furnace for high temperature sintering at 200°C for 30 minutes to form a dense layer with a thickness of 35 nm.

[0070] The third step is to prepare the liquid crystal layer:

[0071] Disperse the liquid crystal molecules 5CB in the chloroform solvent to prepare a transparent and uniform liquid crystal layer solution;

[0072] Depositing the above-prepared solution on the surfac...

Embodiment 2

[0082] The first and sixth preparation methods are the same as in Example 1.

[0083] The second step is to prepare the electron transport layer:

[0084] Using spin coating method to deposit nano-TiO on the surface of transparent ITO electrode 2 The precursor solution of the particle colloid is then put into a muffle furnace for high temperature sintering at 450°C for 40 minutes to form a dense layer with a thickness of 5 nm.

[0085] The third step is to prepare the liquid crystal layer:

[0086] Disperse the liquid crystal molecules 8CB in a chlorobenzene solvent to prepare a transparent and uniform liquid crystal layer solution;

[0087] Spin-coating the above-prepared solution on the surface of the electron transport layer to form a thin film layer at a speed of 3500 rpm for 45 seconds;

[0088] The film layer prepared above was dried at 75° C. for 60 minutes to form an 8CB liquid crystal layer with a thickness of 0.5 nm.

[0089] The fourth step is to prepare the perovskite light-ab...

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Abstract

The invention relates to a perovskite solar cell and a preparation method thereof. By arranging a liquid crystal layer on the surface of an electron transmission layer or a hole transmission layer, the thin film morphology of the electron transmission layer or the hole transmission layer is improved, the defect on the surface of the electron transmission layer or the hole transmission layer is passivated, the transmission of reverse current carriers is effectively blocked, the electric leakage generation is prevented, the combination probability of electrons and holes which are generated in a perovskite light absorption layer is reduced, and the photoelectric conversion efficiency and the stability of the cell are improved; and meanwhile, the liquid crystal layer is prepared by a low-temperature solution method, and the preparation method is suitably used for roll-to-roll industrial production of the perovskite photovoltaic cell, and is simple in process and low in fabrication cost.

Description

Technical field [0001] The invention relates to the technical field of solar cells, in particular to a perovskite type solar cell and a preparation method thereof. Background technique [0002] In recent years, with the depletion of energy and the worsening of the environment, solar cell technology and the market have developed rapidly. In particular, crystalline silicon solar cells have been widely used worldwide. However, with the development of emerging industries and special military fields, solar energy The battery puts forward higher requirements, such as high efficiency, low cost, flexibility, lightness and thinness, high specific power, and spoolable processing. Perovskite solar cells (PSC) have become a hot spot for R&D and industrialization because they meet all the above requirements. [0003] Perovskite solar cells originated from dye-sensitized solar cells (DSSC, containing liquid electrolyte), and then through solid-state DSSC, porous structure PSC (including porous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/56
CPCH10K71/10H10K30/10Y02E10/549Y02P70/50
Inventor 侯丽新王亚丽王金凤刘贤豪程媛王佳李鹤宋鑫赵伟涛
Owner CHINA LUCKY FILM CORP
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