Photoelectrode and Method for Preparing the Same

a photoelectrode and photoelectrode technology, applied in the field of photoelectrode and method for preparing the same, can solve the problems of high cost of silicon solar cells, exhaustion of fossil fuels, etc., and achieves low surface oxygen vacancy concentration, affecting cell efficiency, and good crystallinity

Inactive Publication Date: 2013-06-27
NAT CHENG KUNG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0036]The present invention has proved that the properties of titania, such as crystallinity, surface oxygen vacancy concentration and the like, affect diffusion and life span of electrons, thereby affecting charge collection efficiency. And, the size of titania bead apparently affects the efficiency of light harvesting and electron injection, thereby affecting ...

Problems solved by technology

After industrial revolution, fossil fuel consumptions grew dramatically accompanying with the development of science, and resulted in fossil fuel exhaustion and environmental damages.
However, lots of energy was consumed during the manufacture of solar cells, so it was still a challenge for solar cells to reach grid parity.
But the cost of silicon solar cells was high because pure crystalline silicon materials were widely used in semiconductor industry.
Materials generally used for non-silicon thin-film solar cells were cadmium telluride (CdTe) or copper indium gallium diselenide (CIGS, CuInGaSe), in which the former material was mainly used by First Solar for manufacturing solar cells with the lowest price per watt in all commercial solar cells, but cadmium contamination was a concerned issue; and the latter material could be used for manufacturing stable solar cells with high efficiency and long life span, but the complicated element composition caused low yield rate.
Generally, DSC had a shorter life span an...

Method used

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  • Photoelectrode and Method for Preparing the Same

Examples

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example 1

Analysis of the Titania Products of the Present Invention

[0057]A series of titania products were prepared by using different amount of steric agent (0.25 g, 0.50 g or 0.75 g) and heating at different temperature (120° C., 160° C. or 200° C.) in water-heating treatment. These titania products were labeled with the letter “H” to show that there were obtained after water-heating treatment. For example, “H 0.25 120” represents the titania product prepared by using 0.25 g of steric agent (hexamine) and heating at 120° C. in water-heating treatment by the preparation method of the present invention.

I. Crystal Structure Analysis of the Titania Product of the Present Invention

[0058]The titania products of the present invention were objected to XRD phase identification and electron microscope analysis to identify if these products had a long-range order crystal structure, namely, the structure of anatase titania.

[0059]First, the titania products of the present invention were separately dried...

example 2

Preparation of Dye-Sensitized Solar Cells with an Electrode Manufactured by Using the Titania Product of the Present Invention and P25 Powder and Efficiency Analysis thereof

[0075]The dye-sensitized solar cells comprising a photoelectrode shown in Table 6 were manufactured as foresaid. The structure of these photoelectrodes is shown in FIG. 5(A), which is a well-known structure of dye-sensitized solar cells, comprising two layers made of titania, wherein the first one is scattering layer (bead layer) and the second one is a titania nanoparticle layer (P25 layer). In Table 6, photoelectrode A merely comprised a titania nanoparticle layer composed of pure P25, no scattering layer was comprised. Photoelectrode B comprised a titania nanoparticle layer composed of pure P25 and a scattering layer composed by pure P25, so it was substantively equal to a pure P25 nanoparticle layer of 8 μm. In photoelectrode C-G, the second layer was composed of the titania products of the present invention,...

example 3

Preparation of Dye-Sensitized Solar Cells with an Electrode Manufactured by Using the Titania Product of the Present Invention Alone and Efficiency Analysis thereof

[0082]The dye-sensitized solar cells comprising a photoelectrode shown in Table 7 were manufactured as foresaid, wherein the structure of these photoelectrodes is shown in FIG. 5(B). Photoelectrode O was composed of the nanoparticle H 0.25 200, which was not in form of bead. Photoelectrodes H-N were prepared by using the mesoporous titania bead of the present invention alone. Sample B was the control. The labels of the titania products of the present invention are as foresaid described.

TABLE 7Result of titania layers of photoelectrode prepared by usingthe titania product of the present invention alonethick-BeadCellPhoto-nesssizeDye loadingefficiency ηSampleelectrode(μm)(nm)(×10−7 mol / cm2)(%)BP258—2.374.29HH 0.75 1207.53755.603.16IH 0.75 1602.77501.902.63JH 0.75 1605.27503.643.69KH 0.75 1607.87505.484.03LH 0.75 16010.07506...

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Abstract

The present invention relates to an photoelectrode and the preparation method thereof, wherein said photoelectrode comprises a substrate and a titania layer composed of a mesoporous titania bead having a diameter of 200-1000 nm, specific surface area of 50-100 m2/g, porosity of 40-60%, pore radius of 5-20 nm, pore volume of 0.20-0.30 cm3/g, and the titania comprised in the bead is anatase titania.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a photoelectrode and method for preparing the same.[0003]2. Description of the Related Art[0004]After industrial revolution, fossil fuel consumptions grew dramatically accompanying with the development of science, and resulted in fossil fuel exhaustion and environmental damages. For sustainable survival, the development of renewable and alternative energy was the ultimate goal of the world. In all alternative energies, solar energy caught people's attention because it was abundant and clean, and many companies had invested in the associated research and development.[0005]Solar cell, also called photovoltaic cell, was a device for converting light energy into electrical energy. However, lots of energy was consumed during the manufacture of solar cells, so it was still a challenge for solar cells to reach grid parity. At present, most commercial solar cells were silicon solar cells, in whi...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18B82Y99/00
CPCH01G9/2031B82Y20/00H01G9/2059C01G23/047C01G23/053C01P2002/72C01P2004/03C01P2004/04C01P2004/62C01P2004/64C01P2006/14C01P2006/16C01P2006/40B82Y30/00B82Y40/00Y02E10/542Y02E10/549Y02P70/50H10K71/60
Inventor TING, JYH-MINGKE, CHUN-REN
Owner NAT CHENG KUNG UNIV
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