1：Experimental Design and Method Selection

The study involved the deposition of CuI thin films by spin coating with direct liquid-phase iodination of the films. The effects of temperature and iodine doping on the electrical properties were investigated.

2：Sample Selection and Data Sources

CuI, acetonitrile, and Iodine were purchased from Sigma-Aldrich. CuI was dissolved in acetonitrile at 30 mg/mL and stirred in a magnetic stirrer. The solution was filtered with a nylon filter with 0.45 μm pore. Liquid-phase iodine doping was performed by adding directly iodine at 0.1 and 0.5 wt% in CuI-dissolved solution.

3：List of Experimental Equipment and Materials

Bruker Dektak XTL thickness profiler for thickness measurement, X’Pert-Pro, Philips, Japan XRD Difractometer for XRD study, Carl Zeiss, Model: EVO-18 Research SEM systems for SEM study, Van-der-Pauw technique for electrical conductivity and Hall effect studies.

4：Experimental Procedures and Operational Workflow

The CuI solution was spin coated on glass substrate at speeds of 1000, 2000, and 3000 rpm for 30 sec with 5 sec slope. The deposited CuI thin films were annealed at 100°C for 10 min to remove the residual solvents. The spin coating steps were repeated 3 times for the fabrication of thicker films.

5：Data Analysis Methods

The crystallite size of the CuI films was calculated using the Debye-Scherrer’s formula. The electrical conductivity and Hall effect studies were carried out by Van-der-Pauw technique. The optical transmittance and band gap were measured to observe the effect of I-doping on the optical properties of CuI thin films.