Control of Optical Absorption and Emission of Sputtered Copper Iodide Thin Films

Optical absorption and emission spectra are the important quantifiable properties for CuI as a promising optoelectronic material. Previous research on the sputter deposition of CuI focuses on room-temperature growth. Herein, the effect of growth temperature on the selected optical features of sputtered CuI thin films is investigated. An enhanced visible light transparency and a steeper absorption edge are achieved for CuI thin films by optimizing the growth temperature. The PL intensity ratio of free exciton to defect-related emission increases with increasing substrate temperature. These results suggest a strategy of growth temperature optimization for the enhanced absorption and emission of CuI for advanced optoelectronic applications.

Automated summary

The study investigates the influence of growth temperature on the optical properties of sputtered CuI thin films. Results show that optimizing the growth temperature can enhance the absorption and emission features of CuI thin films, suggesting a strategy for advanced optoelectronic applications.