CZTS film surface secondary phase etching method
A copper-zinc-tin-sulfur, secondary phase technology, applied in photovoltaic power generation, sustainable manufacturing/processing, electrical components, etc., can solve problems such as deliquescence, neurasthenia syndrome, eye and upper respiratory tract irritation, and human injury. Achieve good photoelectric performance
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[0028] Example 1
[0029] The method for etching the secondary phase on the surface of the copper-zinc-tin-sulfur film in this embodiment includes the following steps:
[0030] a. Mix concentrated hydrochloric acid with a mass fraction of 37.5% and deionized water at a volume ratio of 1% to make a hydrochloric acid solution.
[0031] b. Put the vulcanized copper-zinc-tin-sulfur film to be etched in the hydrochloric acid solution prepared in step a, and ensure that the hydrochloric acid solution is excessive.
[0032] c. Place the solution in step b in a constant temperature water bath, and set the temperature of the water bath to 75°C.
[0033] d. Hydrochloric acid reacts with the ZnS secondary phase on the surface of the copper-zinc-tin-sulfur film. The reaction equation is:
[0034]
[0035] ZnCl produced by reaction 2 Dissolved in water, thus successfully removing the ZnS secondary impurity on the surface of the CZTS film.
[0036] e. After reacting the hydrochloric acid and ZnS in ste...
Example Embodiment
[0038] Example 2
[0039] Compared with Example 1, in this example, in step a, concentrated hydrochloric acid with a mass fraction of 37.5% and deionized water were mixed in a volume ratio of 3% to prepare a hydrochloric acid solution; the other steps in this example are all Same as Example 1.
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[0040] Example 3
[0041] Compared with Example 1, in this example, in step a, concentrated hydrochloric acid with a mass fraction of 37.5% and deionized water were mixed in a volume ratio of 0% to prepare a hydrochloric acid solution, that is, the hydrochloric acid in this example The solution is a hydrochloric acid solution with a mass fraction of 0%, that is, all the hydrochloric acid solution is deionized water; other steps in this embodiment are the same as those in embodiment 1. To be precise, this embodiment is actually an example in which the copper, zinc, tin and sulfur film is not etched with hydrochloric acid.
[0042] Raman scattering test was performed on the etched CZTS film in Example 1 to Example 3. A 325nm laser was used during the test. The results are shown in figure 1 with figure 2 , figure 2 Yes figure 1 The enlarged view shown in the dashed box. by figure 1 with figure 2 It can be seen that with the increase of the concentration of hydrochloric acid, the p...
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