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

Abstract

Sensitive nature of organic-inorganic hybrid perovskite material provides an opportunity to turn its electrochemical property. Herein, the conversion process from three-dimensional (3D) CH3NH3PbI3 (MAPbI3) microcubes to one-dimensional (1D) nanorod aggregates was reported by NH3 post-treatment for 30 min, which enhanced the carrier mobility (36.91 cm2/V) and Li-ion diffusion coefficient (5.26 × 10−9 cm2 s−1) and narrowed the optical band gap (1.385 eV) of MAPbI3 nanorod aggregates. The morphology evolution of 3D MAPbI3 crystals and 1D MAPbI3 nanorod rebuilding mechanism induced by NH3 have been investigated and proposed. In addition, compared with samples without NH3 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.