1：Experimental Design and Method Selection:

The study involves the synthesis of SnS2 QDs using a low-cost, facile, green, and effective method under ambient pressure and a temperature lower than 80 °C. The method is designed to produce monodispersed SnS2 QDs suitable for large-scale industrial production.

2：Sample Selection and Data Sources:

The chemical reagents used include SnCl4·5H2O, Na2S·9H2O, and C12H25NaO3S, purchased from chemical reagent companies.

3：List of Experimental Equipment and Materials:

Equipment includes a heating plate, centrifuge, HRTEM (JEM-2100), Raman microscope (Renishaw inVia), FTIR spectrometer (NicoletiS10), UV–Vis absorption spectrometer (SHIMADZU, Uv-1700), fluorescence spectrometer (Hitachi F-4500), XPS (PHI VersaProbe II), XRD (Rigaku D/Max-23), SEM (Hitachi S3400), AFM (SPA-400), Keithley 2400 source meter, and KEYSIGHT B1500A semiconductor device analyzer.

4：Experimental Procedures and Operational Workflow:

The synthesis involves mixing SnCl4 and Na2S solutions with a surfactant, followed by centrifugation to obtain SnS2 QDs. The QDs are then characterized for their structure, morphology, and photoelectric properties. A photodetector is fabricated by drop-casting the QDs solution onto interdigitated gold electrodes.

5：Data Analysis Methods:

The data analysis includes TEM and AFM for size and morphology, UV–Vis and PL for optical properties, and J–V and C–V measurements for photoelectric performance.