NH3-induced morphological evolution of organohalide perovskites from three-dimensional microcubes to one-dimensional nanorod aggregates and their electrochemical performance. (June 2019)

• Record Type: Journal Article
• Authors: Wang, Q.; Yu, S.; Ma, M.; Wu, X.; Qin, W.
• Is Part Of: Materials today chemistry. Volume 12(2019)
• Page Start: 343
• Page End: 352
• Publication Date: 2019-06
• Subjects: MAPbI3 -- Morphology conversion -- NH3 treatment -- Reaction mechanism -- Li ion battery; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2019.03.007
• Languages: English
• ISSNs: 2468-5194

Abstract

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) CH3 NH3 PbI3 (MAPbI3 ) microcubes to one-dimensional (1D) nanorod aggregates was reported by NH3 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 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. Graphical abstract: It is the first report that the capacity of one-dimensional MAPbI3 nanorod aggregates (132 mA h g −1, 300th cycle) is about 16 times higher than that of MAPbI3 cubic crystals without NH3 treatment (8 mAh g −1, 100 th ), which originated from high carrier mobility, Li-ion diffusion coefficient, and special microstructures.Image 1 Highlights: Chemical transformation of three-dimensional (3D) MAPbI3 cubic crystals into one-dimensional (1D) nanorod aggregates induced by NH3 molecules. 3D MAPbI3 microcubes undergo the evolution from the nanoparticles to pyramid-like crystal by dissolution-etching mechanism. Charge capacity of 1D MAPbI3 nanorod aggregates is about 16 times higher than that of 3D MAPbI3 . Improved performances originated from high carrier mobility, Li-ion diffusion coefficient, and special microstructures.