3. Common preparation methods:

1) Sputtering process: CZTS target material;

2) Evaporation process: Using vacuum thermal evaporation method to evaporate four elemental Cu, Zn, Sn, and S at different temperatures under high vacuum; It's difficult to control the proportion of the four elements

3) Spray pyrolysis method: First, spray CuCl, ZnCl2, and SnCl4, and then vulcanize in a specific solution;

4) Electrodeposition method: Firstly, Cu salt, Zn salt, and Sn salt are prepared, and the thin film is obtained through electrodeposition before sulfurization;

4. Purity: 99.99%

5. Packaging: Vacuum bottled