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A solar battery based on a selectivity tunneling principle and a preparation method thereof

A solar cell and selective technology, applied in photosensitive equipment, photovoltaic power generation, etc., can solve the problems of restricting the widespread use of solar cells and high cost, and achieve the effects of easy mass production and packaging, simplified structure, and high photoelectric conversion efficiency

Active Publication Date: 2014-03-26
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commercialized solar cells such as crystalline silicon, amorphous silicon, gallium arsenide, copper indium gallium selenide, and cadmium telluride limit the widespread use of solar cells due to their high cost (Nature.2001, 414, 338)

Method used

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  • A solar battery based on a selectivity tunneling principle and a preparation method thereof
  • A solar battery based on a selectivity tunneling principle and a preparation method thereof
  • A solar battery based on a selectivity tunneling principle and a preparation method thereof

Examples

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Effect test

Embodiment 1

[0052] Example 1. Prototype device using single crystal titanium dioxide as wide bandgap semiconductor and Z907 dye as photoexcitation material

[0053] The structural diagram and schematic diagram of the assembled prototype device are as follows: figure 1 shown.

[0054] A layer of graphene is assembled on one side of titanium dioxide; then a layer of photoexcitation material is assembled on top of the graphene; finally, a layer of low work function metal is deposited on the back of titanium dioxide. Under light, the excited material generates hole-electron pairs, and the interface between titanium dioxide and graphene can selectively allow the photogenerated electrons to tunnel across the conduction band of titanium dioxide and finally be collected by the low work function metal. Electron reduction on graphene, thereby achieving charge separation.

[0055] The specific device preparation method is as follows:

[0056] 1. Preparation of ultra-flat titanium dioxide: single-...

Embodiment 2

[0061] Example 2, a prototype device using single crystal zinc oxide as a wide bandgap semiconductor and D-A dye-sensitive molecules as photoexcitation materials

[0062] 1. Preparation of ultra-flat zinc oxide: Mechanically polish one side of zinc oxide single crystal, etch with 5wt% HF aqueous solution for 30s, and then etch in 30W oxygen plasma for 1min.

[0063] 2. Transfer graphene to the surface of zinc oxide: use chemical vapor deposition (CVD) to prepare monoatomic layer graphene on copper foil, and then use PMMA as an auxiliary layer to transfer graphene to the surface of ultra-flat zinc oxide. First bake at 30°C for 10 minutes to dry the solvent on the surface of graphene and zinc oxide, then bake at 120°C for 6 minutes to ensure close contact between graphene and zinc oxide, and finally heat the boiling acetone solution at 200°C Soak in medium for 3min to remove the transfer auxiliary layer PMMA.

[0064] 3. Assemble a layer of D-A dye-sensitive molecules on top of...

Embodiment 3

[0067] Embodiment 3, Titanium dioxide is a prototype device based on a semiconductor layer and a high polymer photoexcitation material

[0068] 1. Preparation of electron collection layer and titanium dioxide semiconductor layer: use a polished titanium sheet as the electron collection layer in ohmic contact on the back, and then vapor-deposit 500nm of titanium on the polished titanium sheet at a speed of 0.01nm / s by magnetron sputtering, and then Titanium was oxidized to titanium dioxide by annealing in an oxygen atmosphere at 700°C for 3 hours, and finally chemical polishing was performed, etched in 30wt% HF aqueous solution for 5 minutes, and etched in 30W oxygen plasma for 1 minute.

[0069] 2. Transfer graphene to the surface of titanium dioxide: use chemical vapor deposition (CVD) to grow monoatomic layer graphene on copper foil, use PMMA as an auxiliary layer to transfer graphene to the surface of titanium dioxide, and then heat it at 50°C Bake for 5 minutes to dry the ...

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Abstract

The invention discloses a solar battery based on a selectivity tunneling principle and a preparation method thereof. The method comprises the following steps: (1), a wide bandgap semiconductor with smooth surfaces is prepared, and the wide bandgap semiconductor is titanium dioxides or zinc oxides; (2) graphene is transferred to one surface of the wide bandgap semiconductor, and optical excitation materials are assembled on the graphene to obtain an optical excitation material layer; and (3) low work content metal is assembled on the other surface of the wide bandgap semiconductor, so that the solar battery is obtained. Electric charge separating of the solar battery provided by the invention is based on a completely new selectivity tunneling mechanism. Electrons enter a titanium dioxide conduction band in a great-leap-forward tunneling mode. Electron holes can not pass across and are reduced by the electrons on the grapheme, i.e., electrolyte solutions and counter electrodes in traditional dye sensitization solar batteries are successfully replaced just by the monoatomic layer grapheme, so that the structure of the solar battery is substantially simplified.

Description

technical field [0001] The invention relates to a solar cell based on the principle of selective tunneling and a preparation method thereof. Background technique [0002] Solar cells are currently one of the most efficient and promising means of utilizing solar energy. However, currently commercialized solar cells such as crystalline silicon, amorphous silicon, gallium arsenide, copper indium gallium selenide, and cadmium telluride limit the widespread use of solar cells due to their high cost (Nature.2001, 414, 338). In order to reduce the cost of solar cells and meet the use of solar energy in special occasions such as photovoltaic building integration, organic flexible solar cells (Chem.Rev.2010,110,6689), dye-sensitized solar cells (Chem.Rev.2010,110,6595 ), nano solar cells (Chem.Rev.2010, 110, 6873) and other third-generation new solar cells have aroused extensive research interest. In order to make solar power generation more popular, it is urgent to propose new sol...

Claims

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Application Information

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IPC IPC(8): H01G9/20
CPCY02E10/542
Inventor 郭雪峰贾传成顾春晖
Owner PEKING UNIV