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Preparation of columnar granular copper zinc cadmium sulfur (CZCTSSe) thin-film absorption layer and application of layer in solar cell

A copper-zinc-cadmium-tin-sulfur-selenium, columnar grain technology, which can be used in circuits, electrical components, and final product manufacturing, and can solve problems such as many holes

Active Publication Date: 2018-01-19
JILIN INST OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no effective solution to the problem of many holes caused by the arrangement of granular grains in the absorber layer of copper-zinc-cadmium-tin-sulfur-selenide film

Method used

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  • Preparation of columnar granular copper zinc cadmium sulfur (CZCTSSe) thin-film absorption layer and application of layer in solar cell
  • Preparation of columnar granular copper zinc cadmium sulfur (CZCTSSe) thin-film absorption layer and application of layer in solar cell
  • Preparation of columnar granular copper zinc cadmium sulfur (CZCTSSe) thin-film absorption layer and application of layer in solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First prepare pure Cu 2 Zn 1-x Cd x SnS 4 (CZCTS) solution (x=0.05, 18 mL), Cu(AC) 2 2H 2 O(2.48mmol), ZnCl 2 (1.8 mmol), CdCl 2 ·5 / 2H 2 O (0.09 mmol), SnCl 2 2H 2 O (1.5 mmol) and thiourea (8 mmol) were dissolved in 5.5 mL of ethylene glycol methyl ether, and then o C for 1 h to form a brown solution. The pure CZCTS molecular-based solution was spin-coated on a Mo-coated soda-lime glass (SLG) substrate at a rotation speed of 3000 rpm for 20 s. Afterwards, the spin-coated films were subjected to a low-temperature heat treatment for 350 o C, 2 min. The above process was repeated 9 times to prepare a CZCTS precursor film with a thickness of ~1.5 μm. The precursor film was placed in a closed graphite box containing 30 mg for rapid selenization heat treatment. Heat treatment temperature is 580 o C, the holding time is 30 min, and the heating rate is 5 o C / s. Protective atmosphere and pressure: N 2 Gas, 1.1 10 5 Pa. Finally, a granular CZCTSSe absorb...

Embodiment 2

[0026] Take Cu 2 S, ZnS, CdS, SnS 2 as Cu 2 Zn x Cd 1-x SnS 4 Sources of Cu, Zn, Cd, Sn, S; Se powder as Se source. First, mix the above four sulfide powders in a certain proportion, and grind them in an agate mortar for 2-3 hours. After the powder is mixed evenly, at a temperature of 700 o C, Cu with a diameter of 60 mm and a thickness of 3 mm was synthesized by hot pressing at a pressure of 28 Mpa 2 Zn x Cd 1-x SnS 4 Ceramic target. Then, the target was put into the magnetron sputtering vacuum chamber, and the ~1 μm soda-lime glass substrate (SLG / Mo) containing Mo layer was placed directly above the target for thin film deposition. First vacuum the chamber used for sputtering to 7.0 10 -4 Pa, and then pass inert Ar gas and adjust the pressure to 1 Pa (Ar gas flow rate: 30 SCCM). After the pressure is stabilized, start to perform radio frequency magnetron sputtering on the target. Among them, the sputtering power was 60 W, the time was 1 h, and the substrate ...

Embodiment 3

[0029] The granular CZCTSSe obtained in Example 1 is used as the absorbing layer. The device structure of the solar cell refers to the structure of the traditional CZTSSe solar cell: SLG / Mo / CZCTSSe / CdS / i-ZnO / ITO / Al. First, CdS buffer layer (~50 nm) was prepared by chemical bath deposition (CBD) on the selenized CZCTSSe absorbing layer (S1~S5); then, the window layer (~60 nm) was prepared by radio frequency magnetron sputtering. nm i-ZnO, ~250 nm ITO); and the Al electrode (~2μm) was prepared by thermal evaporation; finally, the entire solar cell surface was divided into 9 equal areas (0.16 cm 2 )area.

[0030] The results show that the open circuit voltage of the four copper-based thin film solar cells synthesized under the same conditions is 0.36-0.41 V; the short-circuit current is 23.7-28.2 mA cm 2 ; Conversion efficiency is 3.87% ~ 5.64% (Table 1). It shows that the conversion efficiency of the solar cell is unstable, with large fluctuation and low efficiency.

[003...

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Abstract

The invention provides preparation of a columnar granular copper zinc cadmium sulfur (CZCTSSe) thin-film absorption layer and application of the layer in a solar cell and belongs to the technical field of thin-film solar cells. The surface of the absorption layer is compact, the grain size is 200-500 nm. The cross section of the absorption layer consists of columnar grains arranged tightly, and nohole nor crack exists in a thin film. The columnar granular CZCTSSe absorption layer is smaller and uniform in grain size, and formed columnar grains can effectively decrease holes. The absorption layer is of a single-phase Kesterite-class sphalerite structure preferentially growing along a (112) crystal surface. The columnar grains CZCTSSe are used as an absorption layer to synthesize a Mo / CZCTSSe / CdS / i-ZnO / ZnO: Al / Al copper-based thin-film solar cell. Consequently, it is found that the open circuit voltage of four solar cells synthesized under the same conditions is 0.38-0.43 V; the short circuit current is 30.9-35.1 mA cm<2>; the conversion efficiency is 7.03%-7.12%. It indicates that the conversion efficiency of the solar cells is stable, floating is small and the efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of thin-film solar cells, and in particular relates to the preparation of a columnar grain copper-zinc-cadmium-tin-sulfur-selenium thin-film absorber layer and its application in solar cells. Background technique [0002] With the rapid development of science and technology, the global energy crisis and increasingly prominent environmental problems have made people pay more attention to the research and development of new environmentally friendly energy materials. As a clean and efficient energy source, solar energy has the characteristics of universal irradiation, environmental friendliness, huge reserves, and long-term use, making it the best choice for future energy sources. In the effective utilization of solar energy, solar cells made of copper-based materials have attracted extensive attention from photovoltaic researchers in various countries because of their high conversion efficiency, low cost, and ...

Claims

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Application Information

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IPC IPC(8): H01L21/02H01L31/0216H01L31/18
CPCY02P70/50
Inventor 徐娜孟磊袁亚晴
Owner JILIN INST OF CHEM TECH
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