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Regulation and control method of flexible molybdenum substrate-based cadmium-doped copper zinc tin sulfur selenium thin film with band gap gradient

A copper-zinc-tin-sulfur-selenium and thin-film technology is applied in the direction of climate sustainability, photovoltaic power generation, sustainable manufacturing/processing, etc. It can solve the problems of unfavorable industrial production, flammability and explosion, and the introduction of chlorine, etc., and achieves strong practicability , low cost, simple process effect

Active Publication Date: 2018-04-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the bandgap adjustment method of copper zinc tin sulfur selenide is to introduce metal chloride and metal oxide doping into copper zinc tin sulfur selenide. The disadvantage is that chlorine and oxygen heteroatoms will be introduced into the system.
Although the hydrazine solution can dissolve metal elemental substances, metal sulfides and metal selenides, it is highly toxic, inflammable and explosive, which is not conducive to industrial production.

Method used

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  • Regulation and control method of flexible molybdenum substrate-based cadmium-doped copper zinc tin sulfur selenium thin film with band gap gradient
  • Regulation and control method of flexible molybdenum substrate-based cadmium-doped copper zinc tin sulfur selenium thin film with band gap gradient
  • Regulation and control method of flexible molybdenum substrate-based cadmium-doped copper zinc tin sulfur selenium thin film with band gap gradient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Clean the molybdenum foil, that is, the molybdenum foil is cleaned by electrodeposition in a mixed solution of concentrated sulfuric acid and methanol with a volume ratio of 1:7, and the molybdenum oxide on the surface of the molybdenum foil is etched away, and finally deionized Rinse with water and blow dry with nitrogen; the purity of the molybdenum foil used is 99.99%, the thickness is 0.02mm, and the area is 2cm×2cm;

[0032] (2) Copper, zinc, tin, sulfur, and selenium films with different cadmium contents were prepared on flexible molybdenum substrates by the solution method of dissolving simple substances and post-selenization treatment;

[0033] The concrete steps of the solution method described in its step (2) are as follows:

[0034] A. After mixing elemental copper powder, zinc powder, cadmium powder, tin powder, sulfur powder and selenium powder in proportion, add them to ethylenediamine and ethanedithiol, heat and stir for 1.5 hours; the amount of cadmi...

Embodiment 2

[0045] (1) Cleaning the molybdenum foil: same as in Example 1;

[0046] (2) Copper, zinc, tin, sulfur, and selenium films with different cadmium contents were prepared on flexible molybdenum substrates by using the solution method to dissolve simple substances and post-selenization treatment: the same as in Example 1;

[0047] (3) Deposit a cadmium sulfide film on the surface of the cadmium-doped copper-zinc-tin-sulfur-selenium film obtained in (2) by using a chemical water bath method as a buffer layer, wherein the thickness of the cadmium sulfide film is 50nm;

[0048] (4) Deposit intrinsic zinc oxide (i-ZnO) film on the buffer layer obtained in (3) by sputtering method; where the sputtering gas is Ar, the pressure is 5mTorr, the power is 80W, and the time is 25min, the obtained i -ZnO film thickness is 50nm;

[0049] (5) Deposit an indium tin oxide (ITO) window layer on the i-ZnO film obtained in (4) by sputtering; the sputtering gas is Ar gas, the pressure is 1mTorr, the ...

Embodiment 3

[0054] (1) Cleaning the molybdenum foil: same as in Example 1;

[0055] (2) A cadmium-doped copper-zinc-tin-sulfur-selenium thin film with a band gap gradient was prepared on a flexible molybdenum substrate by using the solution method to dissolve the elemental substance and post-selenization treatment;

[0056] The concrete steps of the solution method described in its step (2) are as follows:

[0057] A. After mixing elemental copper powder, zinc powder, cadmium powder, tin powder, sulfur powder and selenium powder in proportion, add them to ethylenediamine and ethanedithiol, heat and stir for 1.5 hours; the amount of cadmium powder added Prepare two solutions according to the molar percentage of Cd / (Cd + Zn) being 3% and 10% respectively;

[0058] B. Add a certain proportion of stabilizers to the two solutions respectively, i.e. ethanolamine, thioglycolic acid, and ethylene glycol methyl ether are made into stabilizers according to the ratio of substances of 1:1:2. After...

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Abstract

The invention relates to a regulation and control method of a flexible molybdenum substrate-based cadmium-doped copper zinc tin sulfur selenium thin film with a band gap gradient. The regulation and control method comprises the steps of performing cleaning on a flexible molybdenum foil sheet by an electrodeposition method firstly; and next, adopting a solution method for dissolving elementary substances and a post selenylation processing mode to realize changes of the CZCTSSe thin film with band gap gradient through a stacking layer, wherein the method can be used for preparing a thin film solar battery with CZCTSSe thin film with band gap gradient. By adopting the flexible molybdenum as the substrate and by virtue of high-purity molybdenum foil, the problem of adhesiveness between the thin film and the substrate can be solved; a sputtering metal conductive back contact layer in the battery structure is replaced, so that the manufacturing cost is lowered; by adopting the solution method to dissolve the elementary substances for preparing a precursor solution, the shortcoming of impurity ion introduction in metal salt dissolving is avoided; and in addition, the solution method is low in cost, simple in process, capable of realizing large-area production easily, green and environment friendly, capable of satisfying requirements of large-scale batch production and commercialization, and high in practicability.

Description

technical field [0001] The invention belongs to the field of thin-film solar cell materials, and in particular relates to a method for regulating and controlling the bandgap gradient of a CZCTSSe thin film based on a flexible molybdenum substrate. Background technique [0002] At present, the photovoltaic industry urgently needs flexible solar cells, because compared with traditional rigid cells, it has soft materials, thin thickness, light weight, high power-to-mass ratio, low energy consumption in the production process, easy to achieve roll-to-roll large-area continuous production, and convenient Portability and other advantages, and can be installed on non-planar platforms, it is expected to expand the application field of solar cells, making it have broad application prospects in space applications, military fields, building integration, field activities and other fields. Compared with organic thin films and other metal foils (such as stainless steel, aluminum, chrome s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/032
CPCH01L31/0323Y02E10/541Y02P70/50
Inventor 程树英严琼余雪武四新田庆文贾宏杰
Owner FUZHOU UNIV
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