Nanocrystalline film and its low temperature preparing method

A nanocrystalline and thin film technology, which is applied in the field of nanocrystalline precursor thin film with graded structure and its low-temperature chemical sintering preparation, to achieve the effects of reasonable structure design, cost saving, and good transmission of photogenerated electrons

Active Publication Date: 2008-03-19
TSINGHUA UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Therefore, developing a low-temperature preparation process for titanium oxide thin films to prepare flexible DSSCs has great application prospects and is also a great challenge.

Method used

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  • Nanocrystalline film and its low temperature preparing method

Examples

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preparation example Construction

[0029]The preparation method of DSSC in the example: dry the prepared titanium oxide thin film electrode under the condition of 100 ° C for a certain period of time, then immerse the electrode in the ethanol solution of N719 dye for 8 hours, take it out, rinse it with absolute ethanol and let it dry Dye-sensitized titanium oxide film electrodes can be made after drying; the prepared sensitized electrode is used as the working electrode, and the platinum-plated conductive substrate is used as the counter electrode, and the electrode containing 0.5M LiI, 0.05MI 2 and 0.5M tetra-tert-butylpyridine in acetonitrile solution as electrolyte, assembled into a "sandwich" structure of DSSC.

[0030] Photoelectric test method of DSSC in the example: The photoelectric performance measurement of the cell was measured at room temperature using a computer-controlled Oriel sunlight simulation system. The incident light intensity is 100mW / cm 2 , the illuminated area is 0.23cm 2 .

Embodiment 1

[0032] The smallest size nanocrystalline particles used to connect the large particles are first prepared. Using titanium alkoxide (tetrabutyl titanate) as titanium source, take 125mL tetrabutyl titanate and hydrolyze it in 750mL nitric acid solution with pH=1, stir at 80°C until the solution is clear, transfer these solutions to the reaction In the kettle, the sol of titanium oxide was prepared by hydrothermal reaction method; the reaction temperature was 210°C, the reaction time was 12 hours, and anatase-type titanium oxide particles with a particle size of 13nm were prepared; the surface of nanoparticles prepared by this method Adsorbed a large number of hydroxyl groups and H 2 O molecules;

[0033] Thereafter a graded slurry is prepared. Mix commercial titanium oxide nanocrystalline powder (P25, with an average diameter of 25nm) particles and titanium oxide particles with a size above 100nm in ethanol solution, the mass ratio of the two particles is 2.5:1; mix 10nm The ...

Embodiment 2

[0036] The preparation method of the graded structure slurry is the same as that of Example 1, and at last, an oxide film is prepared on a conductive plastic substrate (PEN, polyethylene glycol diformate, square resistance 13Ω, light transmittance 80%) by a scraper coating method. Titanium film, and treated at 150 ° C for 5 minutes, the surface hydroxyl groups between the particles in the film will be dehydrated, thereby preparing a porous titanium oxide film, the specific surface area of ​​the film is 57m 2 / g, the porosity is 29%, the film is assembled into DSSC, and its photoelectric performance is measured, and the short circuit current density is 12.6mA / cm 2 , the open circuit voltage is 0.750V, the photoelectric conversion efficiency is 5.95%, and the fill factor is 0.63.

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Abstract

The present invention relates to a nano-crystal thin film and a low temperature preparation method. The thin film is provided with graded structure and uses nano-crystal titania particles of different sizes as raw materials to add specific chemical bonds or function masses to the surfaces of the nano-crystal particles through a method of surface modification. The materials are mixed in inorganic or organic solution to be prepared into carcass slurries before graded, which are made into films on a flexible conductive basement or any other basement through a simple film making method. Under a low reaction temperature, the particles in the thin films are well connected through chemical sintering, and the nano-crystal particles are connected through good chemical bonds. The whole thin film is provided with high mechanical strength. Flexible dye sensitization solar energy batteries, which are assembled from the thin films, are provided with the high photoelectric conversion efficiency. The thin film and the low temperature preparation method is predicated to be provided with a wide application prospect in photoelectric transformation and photo-catalyst fields.

Description

technical field [0001] The invention belongs to nanometer material precursor and its thin film preparation, in particular to a nano crystal precursor thin film with graded structure and its low-temperature chemical sintering preparation method. The low-temperature thin film can be used not only in dye-sensitized solar cells, but also in fields such as photocatalysts. Background technique [0002] Dye Sensitized Solar Cell (DSSC) is a new type of solar cell, which is favored by scientists from all over the world for its advantages of high efficiency and low cost. DSSC is a "sandwich" structure composed of a transparent conductive substrate, a semiconductor porous nanocrystalline film, an electrolyte solution, and a platinum-coated mirror counter electrode. Among them, nanocrystalline porous film is an indispensable part of DSSC. It has a large specific surface area and plays the role of supporting dyes, separating charges and transmitting photogenerated electrons. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/00B05D5/00C30B29/16H01L31/18
CPCY02P70/50
Inventor 林红李鑫李建保汪文立庄东填
Owner TSINGHUA UNIV
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