Effect of thickness on the photophysics and charge carrier kinetics of graphitic carbon nitride nanoflakes

Abstract

We investigated the thickness effect on the photophysics and charge carrier kinetics of graphitic carbon nitride nanoflakes (g-CNN) by using ultraviolet visible diffuse reflectance spectroscopy, atomic force microscopy, femtosecond transient absorption spectroscopy, and picosecond time-correlated single photon counting measurement. For the first time, we found that g-CNN displays a layer-dependent indirect bandgap and layer-dependent charge carrier kinetics.