1D Light-Emitting MAPbBr₃ Perovskite Encapsulated in Carbon Nanotubes

The instability and broad optical features of perovskites limit the full realization of their unique optoelectronic potential. In this study, a novel MAPbBr₃@SWCNTs hybrid material is presented, in which methylammonium lead bromide perovskite (MAPbBr₃) is successfully encapsulated in single-walled carbon nanotubes (SWCNTs), fabricated in the form of thin films. Encapsulation enables the formation of 1D perovskite structures with narrowband light-emission, confined within a protective carbon nanoshell. A thorough investigation is conducted into the hybrid material's structure, linear optical properties, ultrafast carrier dynamics, and THz conductivity. The encapsulation preserves the distinct characteristics of both MAPbBr₃ and SWCNTs while introducing novel optoelectronic effects, including the tuning and spectral unification of perovskite photoluminescence (PL), as well as doping-induced modifications to SWCNT carrier relaxation dynamics. Furthermore, the observation of negative photoconductivity (NPC) response of MAPbBr₃@SWCNTs thin films highlights the potential of this innovative material as a strong candidate for future energy-efficient photodetectors, optoelectronic switches, neuromorphic computing devices, photovoltaic enhancers, and flexible electronics.