1：Experimental Design and Method Selection

Chemical bath deposition (CBD) technique was used to grow SnS nanocrystals capped by PVA at different bath temperatures ranging from 50 to 80 °C.

2：Sample Selection and Data Sources

Glass substrates were used for the deposition of SnS films. The films were characterized using X-ray diffraction, Raman spectroscopy, FTIR spectroscopy, SEM, AFM, and UV-VIS-NIR spectrophotometry.

3：List of Experimental Equipment and Materials

Stannous chloride (SnCl2, 2H2O), thioacetamide (C2H5NS), tartaric acid (C4H6O6), polyvinyl alcohol (PVA), glass substrates, Burker (D8 Advance) X-ray diffractometer, DI-POLAR XY 800 Raman spectrometer, Thermo Nicolet FTIR spectrophotometer, Carl Zeiss EVO 50 scanning electron microscope, Solver Nano NT-MDT atomic force microscope, JASCO V-770 UV-VIS-NIR spectrophotometer.

4：Experimental Procedures and Operational Workflow

PVA solution was prepared and mixed with stannous chloride and tartaric acid. Thioacetamide was added to the solution, and the mixture was stirred. Cleaned glass substrates were immersed into the solution to deposit SnS films at different bath temperatures for 90 minutes. The deposited films were cleaned and dried.

5：Data Analysis Methods

X-ray diffraction data was analyzed using Debye-Scherrer formula and Williamson-Hall plot. Raman and FTIR spectra were analyzed for phase confirmation and functional groups. SEM and AFM images were analyzed for morphology and topography. Optical properties were analyzed using Tauc plots.