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A method for controlling the bandgap gradient of cadmium-doped copper-zinc-tin-sulfur-selenium thin films based on flexible molybdenum substrates

A copper-zinc-tin-sulfur-selenide and thin-film technology is applied in the direction of climate sustainability, sustainable manufacturing/processing, semiconductor devices, etc. It can solve problems such as unfavorable industrial production, flammable, explosive, and highly toxic, and achieve practicality Strong, low cost, and the effect of reducing manufacturing costs

Active Publication Date: 2019-04-05
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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  • A method for controlling the bandgap gradient of cadmium-doped copper-zinc-tin-sulfur-selenium thin films based on flexible molybdenum substrates
  • A method for controlling the bandgap gradient of cadmium-doped copper-zinc-tin-sulfur-selenium thin films based on flexible molybdenum substrates
  • A method for controlling the bandgap gradient of cadmium-doped copper-zinc-tin-sulfur-selenium thin films based on flexible molybdenum substrates

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 method for controlling the bandgap gradient of a cadmium-doped copper-zinc-tin-sulfur-selenium film based on a flexible molybdenum substrate. First, the flexible molybdenum foil is cleaned by electrodeposition, and then the solution method is used to dissolve the element and then selenized to realize the change of the band gap gradient of the CZCTSSe thin film, which can be used to prepare a thin film solar cell with a CZCTSSe band gap gradient change. The invention uses flexible molybdenum as the substrate, and the use of high-purity molybdenum foil solves the problem of adhesion between the film and the substrate, and replaces the sputtered metal conductive back contact layer in the battery structure, thereby reducing the manufacturing cost; The solution method dissolves the elemental substance to prepare the precursor solution, avoiding the disadvantage of introducing impurity ions when dissolving the metal salt, and the solution method is low in cost, simple in process, easy to produce on a large scale, green and environmentally friendly, and meets the needs of large-scale batch production and commercialization , Strong 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 films and other metal foils (such as stainless steel, aluminum, chrome steel,...

Claims

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Application Information

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Patent Type & Authority Patents(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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