Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr₃ Nanocrystals Films by Hydrophobic Functionalization of the Substrate.

ABSTRACT: The use of lead halide perovskites in optoelectronic and photonic devices is mainly limited by insufficient long-term stability of these materials. This issue is receiving growing attention, mainly owing to the operational stability improvement of lead halide perosvkites solar cells. On the contrary, fewer efforts are devoted to the stability improvement of light amplification and lasing. In this report we demonstrate that a simple hydrophobic functionalization of the substrates with hexamethyldisilazane (HMDS) allows to strongly improve the Amplified Spontaneous Emission (ASE) properties of drop cast CsPbBr₃ nanocrystal (NC) thin films. In particular we observe an ASE threshold decrease down to 45% of the value without treatment, an optical gain increase of up to 1.5 times and

SUBMITTER: De Giorgi ML 

PROVIDER: S-EPMC6884571 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature