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Method for preparing Cu2ZnSnS4 nanocrystalline thin-film solar cell

A technology of solar cells and nanocrystals, applied in the direction of nanotechnology, circuits, electrical components, etc., can solve the problems of limiting battery applications, Cd poisonous, easy to explode, etc., and achieve the effect of reducing weight, cheap price, and reducing environmental pollution

Inactive Publication Date: 2011-09-28
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current preparation of Cu 2 ZnSnS 4 The nanocrystalline thin film solar cell method mainly uses hydrophobic nanocrystals, and toxic organic solvents, such as toluene and chloroform, need to be used in the preparation process.
Although Dr. Mitzi of IBM used nanocrystalline precursors to prepare Cu with a conversion efficiency of 9.6%. 2 ZnSnS 4 Nanocrystalline thin-film solar cells, but the hydrazine used in the preparation process is not only highly toxic, but also extremely explosive
In addition, the currently prepared Cu 2 ZnSnS 4 Nanocrystalline thin film solar cells use CdS as a buffer layer, and Cd is not only toxic but also difficult to recycle
At the same time, the use of glass substrates limits the application of this type of battery in many occasions, such as curved buildings

Method used

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Embodiment 1

[0032] 1. Preparation of flexible substrate

[0033] Firstly, flexible aluminum foil is selected as the substrate, and then ultrasonically cleaned with ethanol and deionized water to remove surface oil stains, and then a layer of metal molybdenum is coated by magnetron sputtering to prepare a flexible substrate.

[0034] 2. Hydrophilic Cu 2 ZnSnS 4 Preparation of nanocrystals

[0035] Synthesis of hydrophobic Cu in the first step 2 ZnSnS 4 Nanocrystalline: Dissolve 0.35mmol copper acetylacetonate, 0.3mmol zinc acetylacetonate, and 0.25mmol tin acetylacetonate in 15mL oleylamine solution, then pass nitrogen into the oleylamine solution, raise the temperature to 120°C to remove water; then raise the temperature to 300°C ℃, inject 5mL oleylamine solution containing 1mmol sulfur, react for 30 minutes, cool and centrifuge to obtain Cu 2 ZnSnS 4 Nanocrystalline. 1mmol Cu 2 ZnSnS 4 The nanocrystals were dispersed in a blend solution of 25mL water / 25mL ethanol / 50mL cyclohexan...

Embodiment 2

[0043] 1. Preparation of flexible substrate

[0044] Firstly, a flexible copper foil is selected as the substrate, and then ultrasonically cleaned with ethanol and deionized water to remove surface oil stains, and then a layer of metal molybdenum is plated by magnetron sputtering to prepare a flexible substrate.

[0045] 2. Hydrophilic Cu 2 ZnSnS 4 Preparation of nanocrystals

[0046] 20 mL of n-heptane was used as the oil phase, bis(2-ethylhexyl) sodium sulfosuccinate was used as the surfactant, and 2 mL of aqueous solution was added to prepare an inverse microemulsion system, which was divided into two parts. The first aqueous solution contained 0.35 mmol of copper acetate, 0.3 mmol of zinc acetate and 0.25 mmol of tin acetate, and the second aqueous solution contained 1 mmol of thioacetamide. Stir the two inverse microemulsion systems separately for about 1 h to obtain a very clear colorless solution, then mix them and stir for 20 min. The mixture was transferred to a h...

Embodiment 3

[0054] 1. Preparation of flexible substrate

[0055] Firstly, a flexible aluminum foil is selected as the substrate, and then ultrasonically cleaned with ethanol and deionized water to remove surface oil stains, and then a layer of metal molybdenum is coated by magnetron sputtering to prepare a flexible substrate.

[0056] 2. Hydrophilic Cu 2 ZnSnS 4 Preparation of nanocrystals

[0057] (A) Weigh 0.35mmol CuCl 2 2H 2 O, 0.3 mmol ZnSO 4 ·7H 2 O, 0.25 mmol SnCl 2 2H 2 O, put in a round bottom flask, add 10mL ethylene glycol, stir, and dissolve each substance. (B) Weigh 5mmol of Na 2 S, dissolved in 10mL ethylene glycol, ultrasonically dissolved. Pour B into A with stirring, continue to stir for half an hour, transfer to a high-pressure reactor, 220 ° C, 24 hours. After the reaction, centrifuge. to get Cu 2 ZnSnS 4 , redispersed in 50mL ethanol solution for later use.

[0058] 3. Cu 2 ZnSnS 4 Fabrication of Nanocrystalline Dense Films

[0059] Take 5mL Cu in the...

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Abstract

The invention relates to a method for preparing a Cu2ZnSnS4 nanocrystalline thin-film solar cell, which comprises the following steps of: performing chemical bath deposition on a ZnS film to form a buffer layer by taking molybdenum-plated metal aluminum as a flexible substrate and a film prepared from hydrophilic Cu2ZnSnS4 nanocrystalline as an absorption layer; and assembling the solar cell by performing magnetron sputtering on intrinsic ZnO, ITO and Ni-Al electrodes. By the method, vacuum equipment is not required, production cost is reduced, and convenience is brought to mass production; raw materials for preparing the Cu2ZnSnS4 solar cell are environment-friendly materials and have low prices, so that the cost of the solar cell is reduced to the great extent; and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of compound semiconductor thin film solar cells, in particular to a Cu 2 ZnSnS 4 A method for preparing a nanocrystalline thin film solar cell. Background technique [0002] The great progress of the society and the substantial increase in the demand for energy have led to the rapid depletion of coal, oil, natural gas and other energy sources, and the environmental pollution is also increasing. People urgently need to find clean and renewable new energy sources. As an infinitely renewable and non-polluting energy source for the earth - the application of solar energy has attracted people's attention day by day. At present, efficient, cheap and stable solar cells have become a research hotspot for scientists. [0003] Current solar cells are mainly divided into: silicon-based (single crystal silicon, polycrystalline silicon and amorphous silicon thin film) solar cells, compound semiconductors (Cu 2 Z...

Claims

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Application Information

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IPC IPC(8): H01L31/18B82Y40/00
CPCY02P70/50
Inventor 胡俊青田启威陈志钢唐明华徐晓峰邹儒佳孙彦刚吴江红张震宇胡向华彭彦玲蒋扉然
Owner DONGHUA UNIV
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