Fig. 5: Application of TMMCs to optoelectronic devices.
From: Ultra-thin 2D transition metal monochalcogenide crystals by planarized reactions

a Raman spectra after varying duration of ozone exposure, indicating high environmental stability. b Optical micrograph of continuous Cu2S films (tears in the film expose the substrate and are due to the transfer process), c current-voltage characteristics for continuous Cu2S film under dark and illuminated conditions, d time evolution of photocurrent under pulsed illumination.