1：Experimental Design and Method Selection:

CrSe thin films were produced using a new variation of chemical bath deposition (CBD) method on glass substrates at different pH values (8, 9, 10, and 11). The method involves the preparation of a chemical bath with specific reagents and conditions to deposit CrSe thin films.

2：1). The method involves the preparation of a chemical bath with specific reagents and conditions to deposit CrSe thin films. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Glass substrates of 60 mm x 25 mm were used. The substrates were cleaned systematically before deposition. The chemical bath was prepared with specific concentrations of Se and CrNi solutions, adjusted to the desired pH with HCl.

3：List of Experimental Equipment and Materials:

Equipment included a scanning electron microscope (SEM) for surface morphology, atomic force microscope (AFM) for thickness measurement, and UV-VIS spectrophotometer for optical measurements. Materials included glass substrates, Se, Na, HCl, and CrNi solutions.

4：Experimental Procedures and Operational Workflow:

The chemical bath was prepared by dissolving Se in concentrated ammonia, adding solid Na carefully, filtering the solution, and adjusting the pH with HCl. Glass substrates were immersed in the bath at 40 °C for 3 hours to allow film growth.

5：Data Analysis Methods:

Optical properties were analyzed using transmittance and reflectance data. Crystal sizes were calculated using the Scherrer formula. Optical band gaps were determined from absorption coefficients.