Improving the thermal- and photo-stability of CsPbBr3 perovskite films by adding graphene oxide for low threshold amplified spontaneous emission

Abstract

Solution-processed all-inorganic CsPbBr₃ perovskite thin films show great promise for green lasers owing to their unique optoelectronic properties and processability. However, the amplified spontaneous emission (ASE) of CsPbBr₃ films with poor heat dissipation still experiences instability due to severe heating effects under high optical pump densities. Here we demonstrate CsPbBr₃:GO films with excellent photostability and ASE properties under ambient conditions by incorporating graphene oxide (GO) as an additive. As the amount of GO increases, the photostability of the perovskite film is improved and the ASE threshold is decreased, while the film surface remains smooth and compact. Moreover, a low threshold of ASE is sustained even after annealing the composite films at 130 °C for 24 hours. These results suggest that the synthesis of CsPbBr₃:GO will open new avenues for controlling the optical properties of perovskite films and advancing the development of optoelectronic devices.