NH3-induced morphological evolution of organohalide perovskites from three-dimensional microcubes to one-dimensional nanorod aggregates and their electrochemical performance

Sensitive nature of organic-inorganic hybrid perovskite material provides an opportunity to turn its electrochemical property . Herein, the conversion process from three-dimensional (3D) CH 3 NH 3 PbI 3 (MAPbI 3 ) microcubes to one-dimensional (1D) nanorod aggregates was reported by NH 3 post-treatment for 30 min, which enhanced the carrier mobility (36.91 cm 2 /V) and Li-ion diffusion coefficient (5.26 × 10 −9 cm 2 s −1 ) and narrowed the optical band gap (1.385 eV) of MAPbI 3 nanorod aggregates. The morphology evolution of 3D MAPbI 3 crystals and 1D MAPbI 3 nanorod rebuilding mechanism induced by NH 3 have been investigated and proposed. In addition, compared with samples without NH 3 treatment, 1D nanorod aggregates exhibited the improved electrochemical performances including capacity (from 53 mA h g −1 to 243 mA h g −1 ) and cycle stability (132 mA h g −1 , 300th cycle) which are ascribed to the improved electronic properties and special 1D microstructure.