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Preparation method, thin film and solar cell of germanium-doped copper-zinc-tin-sulfur-selenium thin film

A technology for preparing copper-zinc-tin-sulfur-selenium and thin films, which is applied in the field of solar photovoltaics, can solve the problems of difficult removal of organic solvents, small CZTS crystal grains, high price, etc., so as to improve the photoelectric conversion efficiency, reduce the sintering temperature, and promote the growth of crystal grains. Effect

Active Publication Date: 2016-11-23
徐东
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanoparticle ink method also has low yield, high price, and is not suitable for mass production; the organic solvent used is not easy to remove in subsequent production, and it is easy to cause problems such as carbon residue in the CZTS film and small CZTS grains.

Method used

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  • Preparation method, thin film and solar cell of germanium-doped copper-zinc-tin-sulfur-selenium thin film
  • Preparation method, thin film and solar cell of germanium-doped copper-zinc-tin-sulfur-selenium thin film
  • Preparation method, thin film and solar cell of germanium-doped copper-zinc-tin-sulfur-selenium thin film

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Embodiment approach

[0032] Such as Figure 1 to Figure 3 As shown, a method for preparing a germanium-doped copper-zinc-tin-sulfur-selenium thin film of the present application, an embodiment thereof, comprises the following steps:

[0033] Step 1, preparing CuS nanoparticles.

[0034] The steps for preparing CuS nanoparticles specifically include:

[0035] Copper halide and Na 2 S is respectively dissolved in an organic solvent;

[0036] The solution of dissolved copper halide and dissolved Na 2 The solution of S is mixed;

[0037] The mixed solution was stirred under ice bath conditions to obtain a colloidal solution;

[0038] The colloidal solution is centrifuged with a centrifuge to obtain CuS nanoparticles.

[0039] In a nitrogen-filled glove box, the copper halide and Na 2 S was dissolved in the organic solvent respectively, and after stirring for 1-20 min, it was taken out from the glove box, and the two solutions were mixed in the fume hood. Copper halides including CuCl 2 、CuBr ...

Embodiment 1

[0053] Such as figure 1 As shown, the CuI 2 and Na 2 S was dissolved in pyridine and methanol solvents respectively, stirred in the glove box for a few minutes, and mixed in a fume hood after being taken out from the glove box to obtain a black sol. The black sol was centrifuged with a high-speed centrifuge to collect CuS nanoparticles at a speed of 10000 rpm for 10 min. Mix the prepared CuS nanoparticles with sulfur powder, zinc powder, tin powder, and germanium powder, wherein the molar ratio of Cu:Zn:Sn:Ge:S is 1.8:1.2:0.9:0.1:4, adding an appropriate amount of ethanol as The dispersant makes the concentration of the solid particles of the precursor slurry 20g / L, and the ball mill is carried out by using a high-speed ball mill, the speed of the ball mill is 400r / min, and the ball milling time is 5h. A precursor film was prepared on the Mo-coated soda-lime glass by scraping the prepared precursor slurry, and the precursor film was obtained after baking at 80° C. for 60 mi...

Embodiment 2

[0055] CuCl 2 and Na 2 S was dissolved in ethanol and formamide solvents respectively, stirred in the glove box for a few minutes, and mixed in a fume hood after being taken out from the glove box to obtain a black sol. The black sol was centrifuged by a high-speed centrifuge to collect CuS nanoparticles at a speed of 12000 rpm for 10 min. Mix the prepared CuS nanoparticles with sulfur powder, zinc sulfide, tin selenide, and germanium powder, wherein the molar ratio of Cu:Zn:Sn:Ge:S is 1.5:1.5:0.3:0.7:4, adding an appropriate amount of toluene As a dispersant, the concentration of the solid particles of the precursor slurry was 1 g / L, and a high-speed ball mill was used for ball milling. The rotational speed of the ball mill was 1400 r / min, and the ball milling time was 30 h. The prepared precursor slurry was used to prepare a precursor film on a stainless steel substrate by dipping and pulling method, and after drying at 250° C. for 10 min, the precursor film was obtained. ...

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Abstract

The application discloses a preparation method of a germanium-doped CZTS thin film. The preparation method comprises the following steps: preparing a CuS nano-particle; preparing a Ge-doped precursor slurry; preparing Ge-doped precursor film; carrying out sulfidizing on the Ge-doped precursor film to obtain a Cu2ZnSn1-xGexS4 film; and carrying out selenylation processing on the Cu2ZnSn1-xGexS4 film to obtain Cu2ZnSn1-xGex(S,Se)4 film. In addition, the application also discloses a germanium-doped CZTS thin film and a solar cell. According to the invention, because the Cus nano-particle is used, grain crystal growing and film densifying can be promoted; the Ge is doped when the precursor slurry is prepared, so that the forbidden band width of the CZTS thin film can be adjusted and the photoelectric conversion efficiency of the CZTS cell can be improved; because an organic solvent like methyl alcohol or ethanol and the like is used, the sulfur source used for sulfidizing processing is solid powdered sulfur, and the selenium source used for selenizing processing is solid selenium powder, the whole production process is environmentally friendly; and a volume expansion effect using a Se atom portion to replace an S atom during the selenizing process is used for structural densifying of the film, and the forbidden band width of the CZTS absorption layer is adjusted, so that matching with a solar spectrum is realized well.

Description

technical field [0001] The application relates to the field of solar photovoltaics, in particular to a method for preparing a germanium-doped copper-zinc-tin-sulfur-selenium thin film, a germanium-doped copper-zinc-tin-sulfur-selenide thin film and a solar cell with a germanium-doped copper-zinc-tin-sulfur-selenium thin film. Background technique [0002] In recent years, with the continuous consumption of petrochemical energy such as coal, oil and natural gas, the development and utilization of renewable green energy has become more and more important. As an inexhaustible green energy, solar energy has become an effective means to solve the current world energy crisis. Photovoltaic power generation is the most important means of economically utilizing solar energy, so the research on various solar cells has been paid more and more attention by scientific researchers all over the world. At present, the bottleneck restricting the development of solar photovoltaic power gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18H01L31/032
CPCY02P70/50
Inventor 徐东徐永清汤珅
Owner 徐东
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